The ARRMA Limitless is one of the most iconic speed run platforms in the RC hobby. Built from the ground up for straight-line velocity, this 1/7 scale machine is capable of 100+ mph right out of the box — and with the right aluminum upgrade parts, you can push it even further while keeping it in one piece. This guide covers every meaningful ARRMA Limitless upgrade, organized by priority, so you know exactly where to start.
Why Upgrade the ARRMA Limitless?
Stock Limitless components are engineered to balance cost and performance for average use. But speed running isn't average. At 80+ mph, the forces on your chassis, drivetrain, and suspension multiply exponentially — and that's where stock plastic parts reach their limits. Aluminum and steel upgrades provide the structural rigidity and impact resistance needed to survive repeated high-speed runs.
The most common stock failure points include:
- Front shocks blowing seals under compression at high landing speeds
- Motor mount flexing under load, changing gear mesh dynamically
- Center diff mount cracking from sustained high-torque runs
- Rear hubs stripping under aggressive braking forces
- Suspension arms fracturing on rough surface impacts at speed
1. Shock Upgrades — Priority #1 for Speed Running
At high speeds, stock shocks blow seals and lose damping consistency. Upgraded aluminum shocks with threaded bodies allow precise spring preload adjustment — critical for dialing in front-end stability at 80+ mph. Both front and rear shocks should be upgraded simultaneously for balanced handling.
1/7 1/8 Arrma Felony Infraction Limitless 6S BLX Front Shocks Upgrades
$28.99 View Product →
1/7 1/8 Arrma Kraton Limitless Mojave 6s BLX Alloy Sliding Motor Mount Upgrades
$20.99 View Product →2. Center Diff Mount — Stop the Cracking
The center diff mount is one of the most stress-loaded components on the Limitless. Under sustained high-torque launches and hard braking, stock plastic mounts develop micro-cracks that eventually lead to catastrophic failure. Aluminum replacements handle the load without fatigue. Upgrading the full center diff mount set (with skid plate and gear cover) gives you comprehensive protection in one go.
1/7 1/8 Arrma Felony Infraction Limitless 6s BLX Center Diff Mount Upgrades
$19.99 View Product →
1/7 1/8 Arrma Felony Infraction Limitless 6S BLX Rear Shocks Upgrades Blue
$28.99 View Product →3. Motor Mount — Lock In Your Gear Mesh
Gear mesh consistency is everything for speed run reliability. The stock plastic motor mount flexes under load, causing your pinion and spur gears to mesh inconsistently — this generates heat, noise, and premature wear. An alloy sliding motor mount keeps mesh locked at any throttle level. The sliding adjustment feature also makes setting the perfect gear mesh significantly easier.
4. Rear Hub & Suspension Arms — Handle the Stress
Rear hubs and suspension arms take the brunt of every landing, bump, and braking event. At speed run velocities, even a small surface irregularity puts massive instantaneous load on these components. Aluminum rear hubs prevent the stripping and cracking that plagues stock plastic units. Aluminum suspension arms provide 3-5x the impact resistance of stock parts, keeping your geometry consistent run after run.
1/7 1/8 Arrma Felony Infraction Limitless 6s BLX Aluminum Rear Hub Upgrades Blue
$32.99 View Product →
1/7 1/8 Arrma Felony Infraction Limitless 6s BLX Center Diff Mount Set Skid Plate Upgrades
$29.99 View Product →5. Suspension Arms & Side Skirts — Complete the Build
Aluminum rear suspension arms are a must-have for any serious Limitless build. Paired with aluminum side skirts, you significantly improve chassis rigidity and reduce flex at the critical rear suspension mounting points. The side skirt upgrade also improves aerodynamic stability by reducing turbulence under the chassis at high speed.
1/7 Arrma Limitless Aluminium Side Skirt Set Upgrades Black
$33.99 View Product →
1/7 1/8 Arrma Typhon Infraction Limitless Aluminium Rear Suspension Arms Upgrades
$27.99 View Product →Build Priority Order
If you're building your Limitless for performance, follow this upgrade sequence:
- Center diff mount — prevents catastrophic mid-run failure
- Motor mount — protects your drivetrain and gears
- Shocks (front + rear) — critical for high-speed stability
- Rear hubs — prevents wheel assembly failure under braking
- Suspension arms — complete structural upgrade
- Side skirts — chassis rigidity and aero refinement
Start with durability upgrades before chasing power. A reliable platform that finishes every run is more valuable than a fast one that breaks on the third pass.
Shop All ARRMA Limitless Upgrade Parts
RC-GF stocks a curated selection of aluminum and steel upgrade components for the ARRMA Limitless. All parts are tested for direct bolt-on compatibility. Browse the full collection below.
