Yokomo BB-126-2 6x12x4mm Ball Bearing (2 pcs) R/C replacement bearing  [BB-126-2]

Low-profile 6x12x4mm ball bearings

This product is an R/C accessory provided as 2 pieces of 6x12x4mm ball bearings for routine bearing replacement and maintenance in radio-controlled models. The listing corresponds to the BB-126-2 designation and gives the dimensional reference you should check against hubs, carriers, or other bearing seats.

Before installing, confirm the bore, outer diameter, and 4mm width of the receiving seat so the 6x12x4mm size clears seals, spacers, and nearby parts. These bearings are used where a slim profile is required; measure the housing to avoid interference prior to press-fit installation.

Fit bearings using steady, even pressure and the correct tools to prevent cocking. After fitment, ensure the rotating assembly spins freely and that any clips or seals are correctly located. Replacing worn 6x12x4mm bearings can lower drivetrain friction and improve overall responsiveness.