Mini 4WD Ringless 9mm Aluminum Roller M4WD-29/RE by 3Racing  [M4WD-29/RE]

Red 9mm ringless aluminum ball rollers M4WD-29/RE

These 9mm ringless ball race rollers are machined from aluminum and intended as spare rollers for Mini 4WD applications. The ball-type contact surface and precision-machined body match common 9mm roller setups, and the red anodized finish provides a visual match for display or spare parts on the bench.

Note for tuners: the absence of an outer ring trims the effective roller diameter at the contact zone, which can be handy where clearance to the chassis or guide walls is minimal. Always inspect post alignment and spacer stacking prior to final assembly to maintain consistent contact lines and predictable behaviour.

Material details come from the manufacturer: machined aluminum with red anodized treatment and a ball-style running surface. Fit using typical Mini 4WD mounting practice and verify rotational freedom after installation to avoid unintended friction from adjacent components.