Compact Mini 4WD 19mm Ringless Aluminium Ball Roller M4WD-40/LB by 3Racing  [M4WD-40/LB]

3Racing M4WD-40/LB 19mm ringless aluminium roller (light blue finish)

The 3Racing M4WD-40/LB is a 19mm ringless aluminium ball race roller supplied in light blue. The design focuses on a smaller external profile, suitable for racers who want reduced protrusion around guides and bumpers.

Practical fitment checks include confirming post diameter, axle spacing and bearing or spacer stack heights. These checks help avoid axial play or rubbing that can affect lap times.

Check roller clearance and protector fittings on MA, MS, AR, FM-A, VS and Super-II chassis types before final installation. Because the roller is ringless, its contact with guide rails differs from conventional ringed rollers, so position and spacer choices matter.

Verify seller labelling, part colour and pack quantity before fitting in a race or display build.