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

Overview of the Mini-Z MR-01 ball diff shaft

This part is a direct-fit replacement shaft for the Kyosho Mini-Z MR-01 ball differential assembly. It functions as the rotating core inside a ball-type differential, allowing torque transfer while permitting the wheels to rotate at different speeds during cornering and traction changes.

Replace the shaft if you notice scoring, excessive play, or rough rotation that harms diff smoothness. A new shaft helps restore consistent differential behaviour and reduces wear on the balls and race surfaces when fitted with correct lubrication.

Fitting is straightforward for anyone used to Mini-Z drivetrains: remove the diff housing, check balls and races, install the shaft with correct seating, and reassemble using the original preload and clearances. Verify handling on the track and adjust diff tuning as part of normal maintenance.