Yokomo BB-126-4 6x12x4mm Ball Bearing (4 pcs.)  [BB-126-4]

Compact 6x12x4mm bearings for RC use

This Yokomo BB-126-4 set contains four compact 6x12x4mm ball bearings designed for RC-scale applications. As a small, serviceable component they are intended for common bearing seats found in wheels, diffs, motor shafts and gearbox assemblies on electric RC models. The parts are supplied in a 4 pcs pack to allow multi-point replacement during routine maintenance or quick upgrades.

In role and tuning terms these bearings serve to lower rotational friction, stabilise shaft alignment, and reduce wear on mating components. When replaced or upgraded they can produce measurable improvements in drivetrain smoothness and throttle response without altering gear ratios or electronics.

Installation notes: verify correct inner diameter fit on the shaft and outer diameter fit in the housing before pressing the bearing into place, use a bearing driver or socket that contacts the outer race to avoid stressing the inner race, and check for endplay after installation. Avoid forcing bearings into mis-sized bores and keep light grease or bearing oil available for reassembly where appropriate.

Maintenance tips: inspect bearings for noise or roughness, clean with a suitable solvent if contaminated, and relubricate with a low-viscosity bearing oil for best free-spin. Replace bearings if you detect pitting, excessive play, or heating under normal running conditions.