Tamiya Mini 4WD Precision 17mm Ringless Ball Roller M4WD-31/LB by 3Racing  [M4WD-31/LB]

Ringless 17mm ball race roller M4WD-31/LB for Tamiya Mini 4WD builds

The 3Racing M4WD-31/LB is a 17mm aluminium ball-type roller offered as a spare or upgrade for 1/32 Tamiya Mini 4WD models. The ringless profile and light-blue anodised finish create a tidy external look and lower the housing diameter for tighter clearances.

Aluminium construction with internal ball components reduces rotational friction versus plastic rollers. The ringless arrangement removes the external retaining flange, which changes how the roller sits against stabiliser plates and guards; check post diameter and mounting hardware before swapping.

Fitment is intended for Mini 4WD chassis that accept 17mm rollers. Check shaft or post diameter, spacer layout, and plate clearance before installation. This product is not described as suitable for Wild or Scale Mini 4WD series, which have different geometry.

Care recommendations: keep the roller clean and add a light bearing-safe oil to the internal balls when rotation feels sluggish. The anodised light-blue finish is primarily cosmetic and will show wear with abrasion or solvent exposure. Confirm spacers and screws do not bind the ball assembly when refitting.