Kyosho Mini-Z MR-01 Ball Differential Shaft by 3Racing KM-010  [KM-010]

Mini-Z MR-01 ball diff shaft overview

This is an RC-scale replacement shaft intended for the Kyosho Mini-Z MR-01 ball differential assembly. It serves as the rotating core inside a ball-type diff, allowing the differential to transfer torque while permitting relative wheel speed differences during cornering and traction changes.

The part is used when a shaft shows wear, scoring, or play that affects diff smoothness. Replacing a worn shaft restores consistent diff behaviour and helps preserve mating components such as balls and race surfaces. Maintain the assembly by checking for wear and re-lubricating with a light diff grease suited to ball differentials.

Installation is straightforward for someone familiar with Mini-Z drivetrains: disassemble the diff housing, inspect balls and races, fit the new shaft ensuring correct seating, and reassemble with the original preload and clearances. Proper assembly affects traction balance and steering feel, so test on the track and adjust diff setup as part of routine tuning.