Tamiya Mini 4WD 9mm Ringless Aluminium Roller Upgrade - M4WD-29/LB by 3Racing  [M4WD-29/LB]

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

The M4WD-29/LB set consists of 9mm ringless aluminium ball race rollers intended for Tamiya Mini 4WD applications. Finished in light blue, the rollers use a ringless bearing layout that reduces outer collar mass and delivers a different bearing interface compared with traditional ringed rollers. The guidance below focuses on practical fit and handling notes for hobbyists.

Fitment notes: rollers are sized at 9mm to fit standard Mini 4WD posts. Ringless construction changes how the roller seats against spacers and axles, which can produce different axial play. Always confirm post diameter and spacer options on your specific chassis before fitting.

Materials and finish: machined aluminium bodies with a light blue coating are typical for aftermarket rollers. These are described as aluminium ball race rollers in a ringless format, suitable for builders who want a colour matched look and a lightweight outer profile that may influence friction and handling characteristics.

Maintenance and compatibility: keep bearings and mating parts clean and free of corrosion. Replace bent axles and avoid forcing rollers that show binding. Use thin spacers to adjust lateral play and treat these as aftermarket accessories—check roller stay geometry and current bearing or bushing diameters prior to installation.