3Racing Mini 4WD 13mm Ringless Aluminium Ball Roller M4WD-30/PK  [M4WD-30/PK]

Ringless 13mm aluminium ball rollers in pink

This 13mm aluminium ball race roller is supplied as a spare for experienced Mini 4WD hobbyists. The ringless bearing layout removes the outer retaining ring, reducing hard contact edges around the roller periphery and altering how the roller meets guide walls and stabiliser setups on common Mini 4WD frames. This item is intended as a replacement roller rather than a full chassis kit.

Compatibility notes: the roller fits standard Mini 4WD roller mounts and typical axle assemblies used on Tamiya-style performance chassis. When installing on MA, MS, AR, FM-A and other performance-focused frames, confirm lateral clearance and spacer setup to preserve intended contact behaviour. This part is not targeted at non-performance series such as Wild Mini 4WD or Scale Mini 4WD.

Fit and service: aluminium construction gives a durable contact surface while the miniature ball-bearing core needs periodic cleaning and light lubrication suitable for small bearings. Check for endplay after fitting and replace if bearing tolerance increases. As a light accessory, consider its effect on roll inertia and balance in builds where mass distribution matters.

Installation considerations: reuse existing roller shafts and spacers where they match, and verify axle length and clip engagement before final assembly. For repeatable results, check alignment under static load and ensure smooth rotation without binding against chassis components or stabilisers.