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

This is a titanium differential shaft designed as an RC-scale replacement part for Kyosho Mini-Z platforms, supplied by 3Racing under model KZ-05. It is intended to fit the Mini-Z MR-02 variants (MM and RM) and the MR-015 differential assemblies, offering a direct swap to the stock steel or alloy shaft where compatible.

Role in the drivetrain: the shaft replaces the rotating element inside the differential to reduce rotating mass and maintain alignment between differential gears, which can yield crisper throttle and steering responses on small-scale track cars. The material choice — titanium — aims to balance reduced inertia with corrosion resistance compared with some steels, while remaining an RC-only drivetrain component.

Installation overview: access the Mini-Z differential by removing the gearbox cover and differential housing, transfer the original differential internals into the assembly and fit the titanium shaft in place of the OEM shaft. Check for proper mesh and free rotation after reassembly. No specialised modifications to the chassis should be required if the unit is confirmed compatible with MR-02 (MM/RM) or MR-015 differentials.

Tuning notes: switching to a lighter shaft is a subtle change in driveline behavior rather than a wholesale upgrade; expect finer transient response rather than dramatic speed gains. Use this part as one element in a measured tuning approach alongside tyre, gearing, and suspension adjustments to refine Mini-Z handling for indoor circuits and club racing.