Mini-Z MR-02 / MR-015 Titanium Differential Shaft KZ-05 by 3Racing  [KZ-05]

The KZ-05 titanium differential shaft is offered as an aftermarket tuning part for Kyosho Mini-Z differentials, designed to replace the rotating shaft in MR-02 (MM and RM) and MR-015 assemblies where geometry matches the OEM part. It targets reduced inertial load to sharpen response for tight, competitive layouts.

Performance intent: reducing rotating mass inside the differential helps maintain gear mesh during rapid throttle transitions and steering inputs, improving transient behaviour that is critical in competitive Mini-Z racing and sprint heats.

Service and fitment: standard differential disassembly and reassembly procedures apply. Remove the gearbox cover and differential housing, transfer internals and seat the KZ-05 shaft. After assembly verify gear mesh, bearing alignment and free rotation to ensure consistent race reliability.

Setup guidance: consider the shaft as a precision tuning item. Combine with tyre choice, gear ratio and suspension adjustments to achieve predictable entry and quicker drive-out in short technical circuits.