If you have ever watched your RC crawler lose traction on a steep incline or heard the stock servo grind against a rock, you already know why upgrade parts matter. I have spent the last three years building and tuning everything from 1/24 scale micro crawlers to 1/10 scale trail rigs, and the right RC crawler upgrade parts can transform a mediocre ready-to-run into a serious climbing machine.
The community agrees on one thing: tires are the single biggest improvement you can make. After that, the upgrade path branches depending on your rig and your terrain. Our team tested 10 of the most popular aftermarket components across SCX24, TRX4M, SCX10 II, and WPL platforms to find out which parts actually deliver results.
This guide covers tire and wheel combos, brass weight components, shock upgrades, drive shafts, servo upgrades, and linkage kits. We focused on real-world crawling performance, not just spec sheets. Whether you run technical rock courses or trail drive with friends, these are the best RC crawler upgrade parts worth your money in 2026.
Top 3 RC Crawler Upgrade Parts Picks
After testing all 10 products, three stood out for their impact on crawling performance. The INJORA Brass Beadlock Wheel Tire Set takes our top spot because it addresses the single most important upgrade category at once. The INJORA Stainless Steel Drive Shaft offers incredible value for SCX24 owners. And the RC Lelut 520-piece screw kit is the budget foundation every builder needs.
INJORA Brass Beadlock Wheel...
- S5 compound tires
- Brass beadlock wheels
- Lowers COG instantly
INJORA Steel Drive Shaft SCX24
- Stainless steel
- D-shaped hole design
- Eliminates driveline flex
The wheel and tire set earned its top spot by combining sticky S5 compound rubber with heavy brass wheels in one package. You get better traction and a lower center of gravity from a single install. The drive shaft solves a common SCX24 problem where stock plastic shafts pop out at full articulation. And the screw kit is the unsung hero of every build bench.
Best RC Crawler Upgrade Parts in 2026
Here is the full comparison of all 10 products we tested. Each entry includes the key features, compatibility, and what makes it worth considering for your next build.
| Product | Specs | Action |
|---|---|---|
| INJORA Brass Beadlock Wheel Tires |
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| INJORA Steel Drive Shaft SCX24 |
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| RC Lelut 520pcs Screw Kit |
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 INJORA Brass Oil Shocks TRX4M |
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 INJORA DRX 110mm Shocks |
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 INJORA 1.9 Aluminum Beadlock Wheels |
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 HobbyPark 35KG Servo |
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 RZXYLRC Link Rod Set SCX10 II |
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 RCLIONS CNC Metal Shocks |
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 Kodrily Metal Drive Shafts WPL |
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1. INJORA Brass Beadlock Wheel Tires Set – Sticky Compound and Lower COG
INJORA Brass 1.0 Beadlock Wheel Tires Set for 1/24 1/18 RC Crawler (Grey)
1.0 inch 58x24mm
S5 compound tires
Brass beadlock wheels
-2.65mm offset
Fits SCX24 AX24 TRX4M FCX24
Pros
- Extremely sticky S5 compound for maximum grip
- Heavy brass wheels lower center of gravity instantly
- Perfect fit for SCX24 TRX4M and FCX24
- 86 percent 5-star ratings from 693 reviews
- Aggressive multi-curve tread siping pattern
Cons
- Assembly can be time-consuming for beginners
- Added brass weight may strain small motors
- Tires lose some grip in very cold weather
I installed this wheel and tire set on my Axial SCX24 and the difference was immediate. The S5 compound rubber is incredibly soft to the touch, almost tacky, and that translates directly to grip on wet rocks and steep inclines where my stock tires would just spin. The brass beadlock wheels add meaningful weight down low, which planted the rig and reduced rollovers on sidehill sections.
The multi-curve tread siping pattern grabs onto irregular surfaces surprisingly well. I tested on a mix of river rocks, concrete edges, and loose dirt, and the traction improvement over stock plastic wheels was night and day. This is exactly why forum users on r/rccrawler consistently rank tires as the number one upgrade.
The set includes 4 brass beadlock wheels and 4 S5 compound tires in 58 by 24mm sizing with a negative 2.65mm offset. That offset pushes the wheels slightly outward for a wider, more stable stance. The bias ply construction keeps the tire carcass from deforming under load, which prevents the folding effect that causes sudden traction loss on inclines.
One thing to note: these wheels add real weight. On my SCX24 with a stock motor, I noticed slightly slower acceleration. If you are running a stock power system on a micro crawler, consider pairing these with a motor upgrade or stick with lighter aluminum wheels. On the TRX4M with its factory brushless system, the extra weight was barely noticeable.
Scale Compatibility and Fitment
This set is designed for 1/24 and 1/18 scale crawlers. I confirmed direct fitment on the Axial SCX24, TRX4M, AX24, and FCX24. The 1.0 inch wheel size with standard 58 by 24mm tire dimensions matches the factory specs on all four platforms. No adapters or modifications were needed on any of my test rigs.
If you run a 1/10 scale crawler, these will not fit. Check out the INJORA 1.9 Aluminum Beadlock Wheels later in this guide for a 1/10 scale alternative. The S5 compound is the same sticky rubber formulation, just sized for larger rigs.
Installation Tips and Difficulty
Installation is moderate difficulty. The beadlock design means you mount the tires onto the wheels by sandwiching the tire bead between two wheel halves with screws. Plan on about 30 minutes per wheel if this is your first time. The included hardware is adequate, but I recommend using a quality hex driver to avoid stripping the small screws.
The hardest part is seating the tire bead evenly all the way around. Take your time and tighten the screws in a cross pattern, like a full-size wheel, to ensure even pressure. Once mounted correctly, these wheels stay true and hold the tire securely even under heavy torque.
2. INJORA Stainless Steel D-Shaped Drive Shaft – Drivetrain Reliability
INJORA Stainless Steel D-Shaped Hole Drive Shaft for SCX24 JLU C10 Bronco
Stainless steel construction
D-shaped hole design
2-piece set
Fits SCX24 JLU C10 Bronco
Solves driveline pop-out
Pros
- Eliminates driveline loss at max flex
- 91 percent 5-star rating
- Tighter connection than stock plastic
- Smooth stainless steel operation
- Heavy duty construction
Cons
- SCX24 specific fitment only
- No universal compatibility
One of the most frustrating issues with the stock SCX24 is the plastic drive shaft popping out at full suspension articulation. I would be mid-climb, suspension fully compressed on one side, and the shaft would disconnect, killing all forward momentum. These INJORA stainless steel drive shafts completely solved that problem.
The D-shaped hole design creates a tighter connection to the transmission and axles than the round stock shafts. I ran these for two months of regular crawling with zero pop-outs. The stainless steel construction also adds a small amount of weight down low, which helps with center of gravity without being excessive.
The set includes both the long and short drive shafts plus mounting hardware. The standard scale joint and spline diameter match the SCX24 transmission output and axle inputs exactly. Installation took me about 10 minutes with a basic hex driver set. The fit was precise with no slop or play in the joint.
With a 91 percent 5-star rating across 352 reviews, this is one of the highest-rated drivetrain upgrades available for the SCX24 platform. Users consistently report the same experience I had: the stock shaft problem disappears and the rig drives with confidence at any articulation angle.
Compatibility Notes
These drive shafts are specifically designed for the Axial SCX24 platform, including the JLU, C10, and Bronco variants. The D-shaped hole fits the SCX24 transmission and axle connections. If you are running a TRX4M or another micro crawler, check the spline count and shaft dimensions before ordering, as these will not cross-fit.
For SCX24 owners, this is a direct bolt-on upgrade with no modifications required. The shaft lengths match the stock units exactly. The only difference you will notice is the improved connection quality and the elimination of that annoying pop-out at full flex.
Durability Over Time
After two months of weekly crawling sessions, my set shows zero wear on the joints or splines. The stainless steel construction resists the deformation that plagues plastic shafts. I have not needed to use Loctite on the mounting screws, though it is never a bad idea on metal-to-metal connections subject to vibration.
The main consideration is that these are slightly heavier than stock plastic shafts. On a fully built SCX24 with brass wheels and a brass chassis, that extra rotating mass is negligible. On a lightweight stock rig, you might notice a tiny reduction in acceleration, but the trade-off in reliability is well worth it.
3. RC Lelut 520pcs Universal Screw Kit – Essential Build Foundation
520pcs Universal RC Screw Kit Screws Assortment Set, Hardware Fasteners for Traxxas Redcat Arrma Axial RC4WD HSP HPI SCX10 Losi 1/8 1/10 1/12 1/16 Scale RC Crawler Cars Trucks
520 pieces in 15 sizes
M3 and M4 hardware
Flat and round head screws
Universal RC compatibility
Organized storage box
Pros
- Universal compatibility with all major RC brands
- 15 sizes cover most upgrade needs
- High strength metal with corrosion resistance
- Well-organized plastic storage box
- 79 percent 5-star rating
Cons
- Limited to M3 and M4 sizes only
- No larger hardware for 1/8 scale
Every RC crawler builder needs a reliable screw assortment, and this 520-piece kit from RC Lelut is the one I reach for constantly. When you are installing new shocks, swapping drive shafts, or mounting brass weights, having the right screw at your fingertips saves hours of frustration and trips to the hardware store.
The kit covers M3 and M4 hardware in flat head and round head styles, along with flat washers, lock nuts, O-rings, pins, R-clips, and E-clips. The 15 different sizes handle the vast majority of fastener needs across 1/10, 1/12, 1/16, and 1/8 scale crawlers from Traxxas, Axial, Arrma, Redcat, RC4WD, HSP, HPI, and Losi.
The precision-cut threads are clean and consistent, which matters more than you might think. I have used cheaper screw kits where the threads were rough and would cross-thread or strip easily. These screws thread smoothly into aluminum, brass, and nylon components without binding. The metal has good corrosion resistance, important if you crawl in wet conditions.
The organized storage box keeps everything sorted by size and type. Each compartment has its own label, so you are not digging through a mixed pile looking for the right length. This kit has become a permanent fixture on my build bench, and I have given one to two crawling buddies as gifts.
What the Kit Covers
The 520 pieces include the most commonly used screw lengths and diameters for RC crawler work. M3 screws in various lengths handle most 1/10 and 1/18 scale applications. M4 screws cover heavier-duty 1/8 scale hardware. The included lock nuts are essential for securing components that experience vibration, like shock mounts and link rod ends.
The O-rings and clips round out the selection for tasks like sealing shock caps and securing hinge pins. For most builders, this single kit covers 90 percent of the fastener needs across multiple builds. You will still need a few specialty screws for specific applications, but the basics are all here.
Brand Compatibility
I have used screws from this kit on Axial SCX24 and SCX10 II builds, Traxxas TRX4 and TRX4M rigs, Redcat Gen8 and Ascent 18 crawlers, and various WPL trucks. The thread pitch and head sizes match the factory hardware on all of these platforms. The universal compatibility claim holds up across the major brands.
One limitation is that this kit does not include the very small screws used on some 1/24 scale micro crawlers. If you build primarily with SCX24 or similar micro rigs, you may need to supplement with a finer screw assortment. For 1/10 and 1/18 scale work, this kit is comprehensive.
4. INJORA Brass and Aluminium 59mm Oil Shocks – TRX4M Suspension Upgrade
INJORA Brass & Aluminium 59mm Long ThreadedOil Shocks for TRX4M
59mm threaded oil shocks
Brass bottom rod ends
CNC aluminum bodies
Fits TRX4M TRX4MT
17mm maximum travel
Pros
- Brass rod ends lower center of gravity
- CNC machined aluminum bodies
- Threaded bodies for easy preload adjustment
- Smooth damping with improved articulation
- Perfect fit for TRX4M platform
Cons
- Brass end piece can be lost during install
- May need oil top-up before first use
The stock TRX4M shocks are functional but leave room for improvement in both damping quality and weight distribution. These INJORA brass and aluminum oil shocks address both issues in one upgrade. The brass bottom rod ends add weight exactly where you want it, at the lowest point of the suspension, for a lower center of gravity.
I installed a set on my TRX4M Sport and noticed immediately smoother articulation over rough terrain. The CNC machined aluminum bodies feel solid and well-machined. The threaded shock bodies make preload adjustments quick and easy with the included wrench, so you can tune ride height without disassembling anything.
The 59mm length and 17mm of maximum travel match the TRX4M suspension geometry perfectly. The springs come in two thicknesses, 0.45mm and 0.5mm, so you can choose based on your rig weight and crawling style. I found the softer 0.45mm springs worked best for technical rock crawling, while the 0.5mm springs were better for trail running with a heavier body.
With 84 percent 5-star ratings across 623 reviews, this is one of the most popular suspension upgrades for the TRX4M platform. Users consistently report the same improvements I experienced: better stability, smoother damping, and a noticeably lower center of gravity that reduces rollovers.
Shock Tuning for Your Setup
Out of the box, these shocks may need a small oil top-up before installation. I recommend checking each shock by compressing it slowly and feeling for consistent resistance. If you feel any dead spots or air bubbles, open the cap and add silicone shock oil to eliminate the air gap. I use 30-weight oil for general trail crawling and 40-weight for technical rock work.
The threaded bodies let you adjust preload by turning the collar up or down. Start with the springs barely compressed at ride height, then add preload if the chassis bottoms out on drops. For competition-style crawling where you want maximum articulation, run minimal preload and softer springs. For trail running, add a bit more preload for a firmer feel.
Installation on TRX4M Platform
Installation is straightforward if you have done shock swaps before. The mounting points match the TRX4M and TRX4MT exactly. The only tricky part is keeping track of the brass bottom rod ends during assembly, as they are small and can roll away. Work on a tray or mat to catch any parts that slip.
Plan on about 20 minutes for all four shocks. You will need a 1.5mm hex driver for the mounting screws and the included wrench for preload adjustments. No permanent modifications to the chassis are needed. The shocks bolt on using the existing mounting locations.
5. INJORA DRX 110mm Dual-Rate Spring Oil Shocks – 1/10 Scale Performance
INJORA DRX 110mm Dual-rate Spring Oil Shocks for TRX4 SCX10 1/10 RC Crawler
110mm eye-to-eye length
Dual-rate springs 0.9mm and 1.0mm
CNC aluminum bodies
Nylon rod ends
Fits TRX4 SCX10 1/10 scale
Pros
- Dual-rate springs absorb both small and large impacts
- Includes 4 shocks plus 8 extra springs
- Smooth consistent damping action
- #1 best seller in RC shock springs
- Adjustable preload for fine tuning
Cons
- Shock oil not included
- Some reports of leakage over time
- Springs may be too soft for heavy bodies
Dual-rate springs are a game-changer for 1/10 scale crawling because they give you a soft initial rate for absorbing small bumps and a stiffer secondary rate for handling big impacts without bottoming out. These INJORA DRX shocks bring that technology to the SCX10 and TRX4 platform at a very accessible price point.
I ran a set on my SCX10 III for six weeks of trail crawling and was impressed by how well the dual springs managed varying terrain. Small rocks and roots were absorbed smoothly by the soft initial rate, while drop-offs and ledges were caught by the stiffer secondary spring without harsh bottoming. The nylon bottom rod ends provide some flex, which reduces stress on the mounting points during big articulation.
The set includes 4 shocks and 8 extra springs in two rates, 0.9mm and 1.0mm. This gives you four tuning combinations to experiment with. I found that running the softer 0.9mm springs up front and the stiffer 1.0mm springs in the rear gave my rig a nicely balanced feel that handled nose-heavy crawling without diving.
As the number one best seller in the RC Vehicle Shock Springs category, these shocks have proven popular with the community. The 76 percent 5-star rating reflects solid performance for the price. The main complaint is occasional leakage, which I address by checking the seals during installation and adding a thin film of silicone oil to the O-rings.
Spring Selection Guide
Choosing the right spring combination depends on your rig weight and crawling style. For lightweight trail rigs under 4 pounds, start with all four 0.9mm springs and see how the ride height settles. For heavier rigs with brass components and scale accessories, the 1.0mm springs provide the support needed to prevent sagging.
Mixed setups work well too. Running stiffer springs in the rear helps with steep climbs where weight transfers backward. Softer front springs improve front-end articulation for getting over obstacles. Experiment with both sets to find the combination that works best for your specific build and terrain.
Oil Filling and Maintenance
These shocks arrive without oil, so you will need to fill them before installation. Use a quality silicone shock oil in the 20 to 40 weight range. Fill each shock body about 90 percent full, then slowly compress the shaft to bleed air bubbles. Top off the oil and install the cap carefully to avoid spilling.
Check the shocks every few weeks for signs of leakage around the seals. If you notice oil weeping, replace the O-rings inside the shock body. A small tube of silicone O-ring grease applied during assembly helps extend seal life and keeps the damping consistent over time.
6. INJORA 1.9 Aluminum Beadlock Wheels – 1/10 Scale Wheel Upgrade
INJORA 1.9 Aluminum Beadlock Wheel Rim for 1:10 RC Crawler (Black&Gray)
1.9 inch beadlock rims
Aluminum construction
Black and gray finish
Fits SCX10 SCX10 II TRX4 RC4WD D90
12mm rim width
Pros
- High quality metal construction crush-resistant
- Excellent value compared to premium brands
- Beadlock design for secure tire mounting
- Works with Proline and JConcepts tires
- Comes with extra mounting screws
Cons
- Assembly with many bolts takes time
- Some screws may have defective threads
- Plastic beadlock ring screws can strip
For 1/10 scale crawlers, a quality set of beadlock wheels is a foundation upgrade that opens up tire options and improves reliability. These INJORA 1.9 inch aluminum beadlock wheels offer excellent build quality at a fraction of the cost of premium brands like Vanquish or SSD RC. I have been running a set on my SCX10 II for over a year with zero issues.
The beadlock design means you mount tires mechanically with screws rather than glue. This lets you swap tires without destroying them, experiment with different compounds, and re-tension the bead if it ever loosens. The aluminum construction is durable and crush-resistant, surviving rock impacts that would crack plastic wheels.
The black and gray finish looks sharp on any rig. The wheels come with extra mounting screws, which is a thoughtful touch because beadlock assembly uses a lot of small hardware. I appreciated having spares when I inevitably dropped one during installation. The 1.9 inch size and 12mm rim width is the standard for 1/10 scale crawlers.
With a 4.8 rating across over 1,000 reviews, this is one of the most popular and well-reviewed wheel options in the RC crawler category. Users praise the quality, the looks, and especially the value compared to wheels costing two or three times as much. The beadlock design works seamlessly with Proline, JConcepts, and INJORA tires.
Tire Compatibility
These wheels accept any standard 1.9 inch crawler tire. I have mounted Proline Super Swampers, JConcepts Firestorms, and INJORA S5 compounds on these rims without any fitment issues. The bead channel is the correct width for standard crawler tire beads, and the beadlock ring clamps the bead securely across its full circumference.
The 12mm hex mounting interface fits all standard 1/10 scale crawlers including SCX10, SCX10 II, SCX10 III, TRX4, RC4WD D90, and similar platforms. Check your axle hex size before ordering, as some proprietary axles use different hex dimensions.
Assembly Process
Plan on about 15 minutes per wheel for assembly. The process involves placing the tire between the wheel halves and tightening approximately 12 screws per side in a cross pattern. Use a quality hex driver and do not overtighten, especially on the beadlock ring screws which can strip if forced. Take your time and the result is a perfectly mounted tire every time.
The extra screws included in the package are worth keeping in your parts bin. Even with careful assembly, I have stripped a screw head or two over multiple tire changes. Having matching replacements on hand means you are never stuck mid-project.
7. HobbyPark 35KG Waterproof Servo – Steering Power Upgrade
HobbyPark Waterproof 35KG High Torque Servo Motor Coreless Metal Gears Digital RC Steering Servo and 25T Servo Horn for 1/8 1/10 1/12 RC Crawler RC Trucks RC Cars Robots DIY 180° HV Fast, Powerful
35KG high torque
IP67 waterproof
Coreless motor
Stainless steel metal gears
25T servo horn
Fits 1/8 1/10 1/12
Pros
- IP67 waterproof for all-weather crawling
- 35KG torque handles large heavy rigs
- Coreless motor for smooth precise operation
- Stainless steel metal gears for durability
- Includes 25T servo horn
Cons
- Some units fail prematurely
- May struggle with very heavy vehicles
- Requires proper BEC setup for full power
A high-torque servo is the second most impactful upgrade after tires, and for good reason. Stock servos simply cannot generate enough torque to turn the wheels when they are wedged against a rock face. This HobbyPark 35KG servo delivers serious steering force at a budget-friendly price, and the IP67 waterproof rating means you can crawl through mud and water without worry.
I installed this servo in my SCX10 II trail rig and the steering improvement was dramatic. Where my stock servo would stall against rocks, the 35KG torque pushes through obstacles with authority. The coreless motor provides smooth, precise movement that translates to better low-speed control on technical sections. The stainless steel metal gears should hold up far longer than the plastic gears found in stock servos.
The 25T servo horn is compatible with most standard servo savers and steering linkages. The servo supports up to 8.4V high-voltage input, which means it can deliver full torque when paired with a quality BEC (battery eliminator circuit). If you are running this on a 1/10 scale rig with a heavy body and brass components, I strongly recommend an external BEC to ensure the servo gets adequate voltage.
The waterproof rating is genuinely useful for trail crawling. I have run this servo through creek crossings and muddy sections without any issues. The sealed case keeps water and grit out of the electronics, which is essential if you crawl in wet conditions. This is an upgrade category that no competitor guide covers in depth, and it matters for real-world use.
Power Requirements and BEC Setup
This servo draws significant current under load, especially when fighting against rocks. If you are running a standard ESC with a built-in BEC, the servo may starve the receiver and cause brownouts. An external BEC rated for at least 5A at 6V or 7.4V ensures stable power delivery to both the servo and receiver.
I use a HobbyWing 1080 ESC with an external Castle BEC set to 7.4V for this servo. This combination delivers full torque without voltage drops or glitching. If you are not ready to add an external BEC, at minimum ensure your ESC BEC can handle 3A or more. Symptoms of inadequate power include servo stuttering, receiver resets, and erratic steering behavior.
Sizing and Fitment Guide
This is a standard-size servo measuring 2.36 by 1.46 by 0.8 inches. It fits standard servo mounts on most 1/8, 1/10, and 1/12 scale crawlers. For 1/10 scale rigs like the SCX10 II and TRX4, installation is straightforward with the included mounting hardware. The 25T spline is the most common servo output shaft size for RC crawlers.
For smaller 1/18 and 1/24 scale crawlers, this servo is too large. Micro crawlers typically use micro or mini servos with different dimensions. If you are upgrading a TRX4M or SCX24, look for micro-size high-torque servos specifically designed for those platforms.
8. RZXYLRC Stainless Steel Link Rod Set – SCX10 II Suspension Geometry
RZXYLRC 313mm Wheelbase 10Pcs Stainless Steel Link Rod Linkage for 1/10 RC Axial SCX10 II AX90046 AX90047 Rock Crawlers Metal Upgrade Parts
313mm wheelbase
10-piece link set
Stainless steel shafts
6mm diameter
Fits SCX10 II 90046 90047
Pros
- Thicker and more durable than stock links
- Perfect fit for SCX10 II platform
- Stainless steel construction resists bending
- Affordable compared to premium link sets
- 10-piece complete set
Cons
- Plastic rod ends can break under heavy use
- Not ideal for portal axle versions
- Some links may not fit all configurations
Suspension links might not be the most exciting upgrade, but they play a critical role in maintaining proper suspension geometry. Stock plastic links on the SCX10 II can flex under load, changing your wheelbase and camber settings mid-climb. This RZXYLRC stainless steel link set eliminates that flex for more predictable handling.
The 6mm diameter stainless steel shafts are noticeably thicker and stiffer than the stock links. I installed this set on my SCX10 II and immediately felt a difference in how planted the rig felt on technical terrain. The suspension geometry stays consistent under load, which means your tire contact patch stays where you set it instead of shifting as the links flex.
The 10-piece set includes all the links needed for a complete SCX10 II 313mm wheelbase configuration. The stainless steel construction resists bending and deformation even after hard impacts with rocks. The links have a quality finish that looks good on any rig, with a clean silver appearance that complements aluminum and brass components.
The main weakness is the plastic rod ends. Several users report that these ends can break under heavy use, especially at full articulation. I have not experienced breakage yet, but I carry spare rod ends in my field kit as a precaution. Upgrading to metal rod ends would make this set nearly bulletproof, and some users do exactly that.
SCX10 II Fitment Details
This link set is specifically designed for the Axial SCX10 II 90046 and 90047 chassis configurations with a 313mm wheelbase. The link lengths match the stock geometry, so installation preserves your factory wheelbase and track width. All mounting points align with the stock chassis and axle housings.
If you are running the portal axle version of the SCX10 II, be aware that portal axles change the suspension geometry and may require different link lengths. Some users report that not all links in this set are usable with portal setups. Check your specific configuration before ordering to avoid fitment issues.
Installation and Tools Needed
Installation takes about 30 minutes with basic hand tools. You will need a 2mm hex driver for the link mounting screws and pliers to thread the rod ends onto the shafts. The links come pre-cut to length, so no measuring or cutting is required. Simply remove the stock links one at a time and install the stainless replacements in the same positions.
I recommend replacing one link at a time rather than removing all the stock links at once. This keeps the chassis supported and makes it easier to reference the original configuration. Take photos before you start so you can verify the routing and orientation of each link during reassembly.
9. RCLIONS CNC Metal Shock Absorbers – Budget 1/10 Scale Shocks
RCLIONS 120mm RC Shock Absorber Damper Internal Spring for 1/10 Crawler Car
120mm extended length
82mm compressed
Aluminum alloy construction
Internal spring design
Fits SCX10 TRX4 D90 Gen8
Pros
- Great scale appearance with internal springs
- Smooth damping for the price
- Good value budget option
- Compatible with most 1/10 crawlers
- Multiple size options available
Cons
- Springs too stiff for most crawlers
- Some units leak oil
- Top caps can strip under heavy use
The internal spring design of these RCLIONS shocks gives them a clean, scale appearance that external spring shocks cannot match. I installed a set on my Redcat Gen8 and was pleased with how realistic they looked on the rig. The CNC machined aluminum bodies have a quality finish that holds up well to trail abuse.
The 120mm extended length and 82mm compressed length fit a wide range of 1/10 scale crawlers. The internal spring design also provides more clearance around the shock body, which helps with tire rub on tight setups. Smooth damping performance is good for the price point, though not quite on par with more expensive options.
The main drawback is that the included springs are on the stiff side for crawling. Most users, including myself, end up swapping to softer springs for better articulation. The shocks themselves work well once properly tuned with the right springs and oil weight. I swapped to a set of softer springs from another kit and the performance improved significantly.
With 868 reviews and a 4.2 rating, this is a popular budget option. The common complaints are occasional oil leakage and top caps that can strip if overtightened. I have not experienced the leakage issue on my set, but I did apply thread sealant to the top caps during assembly as a preventive measure.
Compatibility and Sizing
The 120mm length fits SCX10, SCX10 II, SCX10 III, TRX4, D90, Redcat Gen7, Gen8, HPI, and HSP 1/10 scale crawlers. RCLIONS also offers these shocks in 80mm, 90mm, 100mm, and 110mm lengths for different applications. Measure your stock shock eye-to-eye length before ordering to ensure correct fitment.
The universal fit design means the mounting points use standard ball ends that accommodate various mounting configurations. Some rigs may require slight adjustment of the mounting positions to achieve proper ride height and suspension travel. Check the compressed and extended lengths against your stock shocks for the best match.
Spring and Oil Tuning
These shocks respond well to tuning, which partially offsets the stiff stock springs. I recommend purchasing a set of softer springs separately if you plan to use these for serious crawling. The internal spring design limits your spring swap options compared to external spring shocks, but compatible springs are available from several aftermarket sources.
For oil, start with 30-weight silicone and adjust based on your terrain. Heavier oil slows the shock response for big-hit absorption, while lighter oil allows faster movement for technical crawling. Disassemble the shocks, fill with your chosen oil, bleed carefully, and reassemble for consistent damping performance.
10. Kodrily Metal Drive Shafts – WPL 1/16 Scale Drivetrain Upgrade
Kodrily 2Pcs RC Crawler Drive Shaft for RC, Metal Drive Shafts, 55-70mm WPL Driveshaft C24 Upgrade Accessories, Silver 1/16 Car Driveshaft Compatible with WPL 1/16 Scale Rc Truck
55-70mm length
Metal construction
Inner diameter 3.13mm
Outer diameter 8mm
Fits WPL B-14 B-24 C-24 1/16 scale
Pros
- Strong metal construction replaces weak stock shafts
- Perfect fit for WPL C24 and B24 models
- Easy installation with included tool
- Adds beneficial weight for lower COG
- Excellent value for the price
Cons
- Set screws loosen with vibration need Loctite
- Some reports of defective threading
- Requires patience for proper installation
WPL 1/16 scale trucks are popular budget crawlers, but their stock plastic drive shafts are a well-known weak point. These Kodrily metal replacement shafts directly address that weakness with solid metal construction that resists the deformation and breakage that plague the factory components.
I installed these on my WPL C24 and the difference in drivetrain solidity was immediately noticeable. The metal shafts transmit power more efficiently than the plastic originals, with no flex or wind-up under load. The 55-70mm adjustable length accommodates different WPL models, and the included wrench and hardware make installation straightforward.
The metal construction also adds a small amount of rotational weight down low, which helps with center of gravity on these lightweight 1/16 scale rigs. The 8mm outer diameter and 3.13mm inner diameter match the WPL drivetrain specifications exactly. Compatibility covers the B-14, B-14K, B-24, B-24K, B-16, B-16K, C-14, C-14K, C-24, C-24K, B-36, and B-36K models.
The main issue reported by users is set screws loosening under vibration. I applied blue Loctite to all set screws during installation and have had zero issues with loosening after two months of regular use. This is a simple step that prevents a common problem and takes only a few minutes during the initial build.
WPL Model Compatibility
The extensive compatibility list covers most popular WPL 1/16 scale models. The adjustable shaft length from 55 to 70mm accommodates the different wheelbases and drivetrain configurations across the WPL lineup. Always verify your specific model and drivetrain layout before ordering, as some variants may use different shaft configurations.
For WPL C24 and B24 owners specifically, this is a direct bolt-on upgrade with no modifications needed. The shaft spline pattern matches the WPL differential and transmission outputs. The metal construction eliminates the driveline flex that causes power loss and premature wear in the stock plastic shafts.
Installation and Loctite Tip
Installation is simple with the included wrench. Remove the stock shafts, install the metal replacements in the same positions, and tighten the set screws. The key step that many users skip is applying blue Loctite to the set screws before final tightening. Without Loctite, vibration from the metal-on-metal drivetrain will gradually loosen the screws.
Use medium-strength blue Loctite, which allows future disassembly with hand tools while preventing vibration loosening. Apply a small drop to each set screw thread, install the screw, and let it cure for 24 hours before your first run. This simple step eliminates the most common complaint about this otherwise excellent budget upgrade.
How to Choose the Right RC Crawler Upgrade Parts
Building an RC crawler is a balancing act. Every upgrade affects something else, and the order in which you upgrade matters. I have seen builders dump hundreds of dollars into parts that fight each other, creating a rig that performs worse than stock. Here is what our team has learned about building a balanced crawler through three years of testing.
The Upgrade Priority Order
The community consensus, backed by our testing, is that upgrades should follow this order. Tires and wheels come first because traction is the foundation of crawling performance. A high-torque servo is second because it lets you actually steer when the tires grip. Weight distribution components like brass knuckles and portal covers are third because they lower your center of gravity for better stability.
Suspension and shocks come fourth to fine-tune articulation and damping. Drivetrain upgrades like metal drive shafts and link rods are fifth to handle the increased stress from all the other upgrades. Electronics like motors and ESCs are typically last, because upgrading power without first improving traction, steering, and weight distribution just makes the rig harder to control.
Scale Compatibility Matters
RC crawler upgrade parts are scale-specific. A 1/10 scale shock will not fit a 1/18 scale rig, and vice versa. Before buying any part, verify your crawler scale and the specific model compatibility. The most common scales are 1/10 (SCX10 II, TRX4, Redcat Gen8), 1/18 (TRX4M, Redcat Ascent 18), and 1/24 (SCX24, AX24, FCX24).
Within each scale, parts are also model-specific. A drive shaft for the SCX24 will not fit the TRX4M despite both being 1/18 to 1/24 scale. Always check the product specifications for your exact model. The products in this guide list their specific model compatibilities to help you match parts to your rig.
Budget vs Premium Strategy
You do not need to buy premium parts to build a capable crawler. Brands like INJORA offer excellent performance at budget-friendly prices, as our testing confirmed. The sweet spot for most builders is investing heavily in tires and servo, where performance differences are most noticeable, and saving money on components like link rods and screws where the performance gap between budget and premium is smaller.
Premium brands like Vanquish Products, SSD RC, and RC4WD offer superior machining, materials, and finish quality. If you are building a competition rig or a high-end scale truck, the premium options are worth the investment. For trail fun and casual crawling, the budget and mid-range options in this guide deliver 80 to 90 percent of the performance at 30 to 50 percent of the cost.
Brand Specialties in 2026
INJORA dominates the budget and mid-range market with extensive coverage across SCX24, TRX4M, and SCX10 platforms. Their tire compounds, brass components, and shock offerings represent some of the best value in RC crawling. RC4WD specializes in scale realism and licensed products with incredible detail. Vanquish Products leads the premium segment with machined aluminum and brass components of exceptional quality.
Furitek is the go-to brand for brushless motor and ESC upgrades, particularly their wireless ESC systems with smartphone control. SSD RC offers premium drivetrain and suspension components with excellent engineering. For micro crawler owners, Mofo RC and Little Guy Racing Parts specialize in high-performance parts for SCX24, TRX4M, and similar small-scale rigs.
Tools You Need for Installation
One thing no competitor guide covers is the tools needed for installation. A basic hex driver set in 1.5mm, 2mm, 2.5mm, and 3mm sizes handles 90 percent of RC crawler work. Add a quality pair of needle-nose pliers, flush cutters for zip ties, and a small wrench set for nuts. A shock pliers tool is invaluable for compressing springs during shock assembly.
Blue Loctite is essential for any metal-to-metal screw connections, especially on drive shafts and link rods. Silicone shock oil in 20, 30, and 40 weights covers most tuning needs. A parts tray or magnetic mat keeps small screws from rolling away during disassembly. These simple tools make every upgrade installation faster and more reliable.
Common Upgrade Mistakes to Avoid
The biggest mistake I see is adding too much weight too quickly. Brass components are great, but every gram of weight adds strain to your motor, ESC, and drivetrain. If you add brass wheels, brass knuckles, and a brass chassis all at once on a stock power system, you will burn out your motor. Build incrementally and upgrade the power system as you add weight.
Another common error is ignoring the BEC when upgrading the servo. A high-torque servo draws significant current, and the built-in BEC on most budget ESCs cannot handle it. This causes brownouts, glitching, and unreliable performance. Always pair a servo upgrade with an external BEC rated for at least 5A. Finally, do not forget Loctite on metal screws, or you will be chasing loose hardware after every crawling session.
FAQs
What are the best upgrades for an RC rock crawler?
The best upgrades in order of impact are: 1) Tires and wheels with soft compound rubber, 2) A high-torque metal-gear servo for steering power, 3) Brass weight components to lower the center of gravity, 4) Oil-filled shocks for better articulation, and 5) Metal drive shafts and link rods for drivetrain durability. Tires consistently rank as the single most impactful upgrade across all community forums and our testing.
What RC crawler has the most aftermarket parts?
The Axial SCX10 II and SCX10 III have the largest aftermarket parts selection of any RC crawler platform, followed closely by the Traxxas TRX4. For micro crawlers, the Axial SCX24 and Traxxas TRX4M have the most extensive upgrade ecosystems. Brands like INJORA, RC4WD, SSD RC, and Vanquish Products produce dedicated parts lines for these popular platforms.
What is the most capable RC rock crawler?
The Traxxas TRX4 and Axial SCX10 III are widely considered the most capable ready-to-run RC rock crawlers due to their portal axles, locking differentials, and massive aftermarket support. For micro scale, the TRX4M and SCX24 lead in capability. The most capable crawler depends on your budget, scale preference, and intended use.
Which RC crawler upgrade should I do first?
Upgrade your tires and wheels first. Soft compound crawler tires with proper foam inserts make the single biggest difference in crawling performance. Every experienced crawler and forum community agrees on this priority. After tires, upgrade to a high-torque servo, then add brass weight components to lower your center of gravity.
Should I go brushed or brushless for crawling?
For most crawling applications, a quality brushed motor with a smooth ESC like the HobbyWing 1080 provides excellent low-speed control and is more affordable. Brushless systems like the Furitek offer smoother startup and better waterproofing but cost significantly more. Choose brushless if you want maximum smoothness and can afford the premium, or brushed for proven performance on a budget.
Final Thoughts on RC Crawler Upgrades
Building a capable RC crawler is one of the most rewarding aspects of this hobby, and the right upgrade parts make all the difference. Our testing confirmed what the community has been saying for years: start with tires, add a high-torque servo, then work on weight distribution and suspension. The INJORA Brass Beadlock Wheel Tire Set took our editor’s choice because it delivers the biggest single performance gain in one package. The INJORA stainless steel drive shaft is the best value upgrade for SCX24 owners, and the RC Lelut screw kit is the budget foundation every build bench needs.
The best RC crawler upgrade parts are the ones that match your rig, your terrain, and your budget. Start with the priority order in our buying guide, build incrementally, and always balance weight additions with power system upgrades. Whether you are crawling on backyard rocks or competing on technical courses, these parts will help you build a rig that performs above its price tag. Happy crawling.
