3Racing Tamiya Mini 4WD Ringless 9mm Aluminium Rollers - M4WD-29/LB - Replacement Part  [M4WD-29/LB]

M4WD-29/LB 9mm ringless aluminium rollers for Tamiya Mini 4WD

The M4WD-29/LB product is a set of 9mm ringless aluminium ball race rollers intended for use on Tamiya Mini 4WD chassis. Presented in a light blue finish, the rollers adopt a ringless bearing profile that reduces outer collar mass and modifies the way the roller loads on axle and spacers. Below are practical notes on fit, materials, and upkeep tailored to serious hobbyists.

Fit and mechanical notes: these 9mm rollers are designed for standard Mini 4WD roller posts. Without an outer ring the roller sits and bears differently, which typically results in altered axial play compared with ringed variants. Check post diameter and spacer possibilities on your chassis before fitting to ensure correct lateral clearance.

Materials and appearance: machined aluminium bodies with a light blue surface treatment match common aftermarket styling. Marketed as aluminium ball race rollers in a ringless configuration, they are useful for colour-coordinated builds and can influence rotational friction and handling depending on the overall roller assembly.

Maintenance guidance: keep bearings and mating surfaces free from grit and moisture, replace any bent or fatigued axles, and use thin spacers to set lateral play without excessive preload. Treat these as aftermarket accessories and confirm fit with your roller stay design and current bearing or bushing dimensions.