In The Box

Maximum CG Per Gram

Rock-Tek positions weight at bottom-dead-center inside the tire, delivering the greatest center-of-gravity reduction per gram added compared to traditional chassis, axle, or static wheel weights.

Reduced Rotating Mass

A bearing-supported internal design allows the mass to remain effectively non-rotational relative to the chassis, minimizing rotational inertia and reducing driveline strain compared to fully rotating brass systems.

Magnetic Bottom-Dead-Center Control

Magnetic coupling keeps the weight stabilized at bottom-dead-center during climbs and side hills for maximum stability. The kit includes mounting hardware for SCX10 III and TRX-4 front knuckles and can be easily adapted to many other crawler platforms. Rock-Tek can also be run without the magnet, allowing the weight to free-spin and self-position with gravity, while still outperforming traditional fixed brass weight setups.

Tunable Performance

With a 208g base assembly and optional addition of two 54g brass weights (PRO647902), Rock-Tek allows precise performance tuning for competition or advanced trail builds. The system can operate with magnetic coupling engaged to stabilize the weight at bottom-dead-center, or without the external magnets for free-spin operation while still maintaining most of its low-CG performance advantage. This gives drivers the flexibility to tune how the system behaves based on terrain, driving style, and setup preference.

Hidden, Scale-Correct Integration

Fully contained inside standard 1.9" beadlock wheels, Rock-Tek preserves clean axle and knuckle aesthetics without altering track width or adding external brass clutter.