TAMIYA BBX BB-01 CNC-Ready 40Cr Transmission Gear Set BBX1200S by GPM  [BBX1200S]

Precision steel gears for BB-01 rear transmission

This aftermarket gear set is engineered for the TAMIYA BBX BB-01 1/10 chassis and replaces the factory nylon components with hardened 40Cr steel teeth to enhance wear resistance under repeated torque cycles. The geometry is matched to the BB-01 rear gearbox so the gears fit in the original mounting positions for direct replacement.

The kit includes the three principal transmission gears plus a copper collar for axial location in the gear stack, supplied as a compact parts set for the BB-01 rear housing. Part counts and arrangement follow the original design to maintain correct gear spacing and alignment.

Workshop guidance: when installing steel gears check bearing radial runout and race condition, set mesh using feeler and rotation checks, and confirm the copper collar is seated to avoid endplay. Steel teeth increase contact stresses versus nylon, so verify torque distribution and perform controlled break-in cycles to stabilise wear patterns.

For serious hobbyists wanting improved drivetrain longevity, the 40Cr steel gear set offers a precision aftermarket solution for the BB-01 rear transmission when installed with appropriate bearing checks and mesh setup.