Yokomo BB-126-2 R/C 6x12x4mm Bearing Pair  [BB-126-2]

Slim 6x12x4mm bearing set for drivetrain use

This listing supplies two 6x12x4mm ball bearings designed for general R/C replacement and upkeep. The BB-126-2 identifier is provided to confirm the dimensional match for hubs, carriers, or other bearing housings.

Check the inner diameter, outer diameter, and the 4mm width of the receiving seat before fitting to ensure the 6x12x4mm bearings do not interfere with seals or spacers. These narrow-width bearings are used where compact fitment is required; always measure the seat depth and nearby clearances.

When pressing bearings into place, apply steady, uniform pressure and use suitable fixtures to avoid misalignment. After fitting, verify free rotation and correct placement of retaining hardware. Fresh 6x12x4mm bearings can noticeably reduce drivetrain drag and improve component response during tuning.