3RACING M4WD-40/PK 19mm Ringless Aluminum Ball Rollers for Tamiya Mini 4WD  [M4WD-40/PK]

Technical overview of 3RACING M4WD-40/PK rollers

The 3RACING M4WD-40/PK 19mm aluminum ball race rollers are a precision-focused upgrade for Tamiya Mini 4WD platforms. Their ringless construction reduces rotating mass to improve transient response while maintaining durable aluminium contact surfaces.

Engineering intent and benefits

These rollers are engineered to lower bearing friction and reduce inertia at the wheel plane, which supports sharper corner entry and faster spin-up. The 19mm diameter is selected to provide a compromise between lateral stability and rapid directional change.

Compatibility with common chassis

Designed for compatibility with MS, MA and AR chassis families, the rollers integrate with standard mount systems. Verify spacer and shaft tolerances during installation to maintain optimal alignment and avoid side-loads on bearings.

Tuning and integration guidance

For competitive setups, pair these rollers with considered motor gearing and balanced weight distribution. Regularly inspect bearings and mounting hardware for wear, and use light bearing oil to preserve free rotation without attracting contaminants.