Tamiya M03/M03L/M04M/FF02 Ball Bearing Upgrade (2RS) M04M-05 by 3Racing  [M04M-05]

What the bearing set does

This kit fits Tamiya M03, M03L, M04M and FF02 on-road chassis and includes sealed 2RS bearings to replace worn stock units. Sealed bearings keep lubrication in and dirt out, restoring quiet, low-resistance rotation to wheels, differentials and shafted components.

Use this upgrade when you detect drag, uneven spin or drivetrain noise. Correct bearings reduce binding and rolling resistance, helping you dial in consistent handling for both practice laps and street runs.

Fitment advice: press bearings into hubs, carriers and gearbox housings with a suitable driver. Ensure the bearing is square before pressing and do not lever against the seal edge. After fitting, verify free spin and check for endplay at each point.

Service notes: while sealed bearings need less routine attention than open types, inspect periodically for roughness, axial play or grease leakage. Swapping bearings is an efficient way to lower drivetrain losses without altering gearing or suspension fundamentals.