Mini 4WD PRO POM 13mm Rollers with Bearing Inserts for Super-II chassis - Tamiya 15551 Jr  [15551]

13mm POM rollers engineered for low friction

Tamiya supplies these 13mm plastic rollers as a compact choice for builders focused on multi-lane performance. The rollers feature a wider POM plastic outer ring (blue) surrounding a ball-bearing centre, with aluminum inserts used to fasten the bearings to the roller body. Together these parts aim to minimise rotating weight while keeping smooth spin when the car is loaded in a turn.

Relative to older plastic-ring 13mm rollers, this set enlarges the plastic section and keeps metal inserts to retain bearings. The maker highlights reduced mass versus some aluminum ringless variants, making this a lighter option where chassis balance and reduced rotating inertia matter. The kit contains two rollers and the screws needed for mounting, and it is compatible with Mini 4WD PRO and standard Mini 4WD cars.

These rollers suit track formats where 13mm rollers are common, including 3- and 5-lane circuits. The POM face lowers friction against lane banks and the ball-bearing cores cut internal resistance versus plain bushings. Aluminum holders help keep bearings seated through impacts or extended running.

Overall, these rollers are a bearing-equipped, lightweight plastic option for racers preferring POM-bodied 13mm rollers on multi-lane layouts; actual benefit depends on car setup and course shape.