Mugen Seiki MRX4/MRX4-R 6mm 7075 Main Drive Shaft - MRX4-12/TI by 3Racing  [MRX4-12/TI]

Drive shaft role and fit

This 6mm main shaft is presented as a replacement or upgrade for Mugen Seiki MRX4 and MRX4-R touring chassis, positioned in the final drive train to take spur and pinion forces while transferring power from the gearbox to the wheels.

Practically its purpose is to preserve concentricity across the drivetrain and to withstand routine race and practice wear. When replacing the factory shaft, verify bearing seating, align mating gears, check for smooth rotation, and inspect contact surfaces for wear.

As a tuning aid the 7075 aluminium shaft gives a good stiffness-to-serviceability ratio and serves as a consistent reference when setting gear mesh and measuring backlash. Regular checks for burrs, scored areas, or bending will keep gear engagement predictable and cut unexpected drivetrain drag.

Fit this part where a like-for-like replacement or a straightforward upgrade is needed for MRX4/MRX4-R platforms; always recheck bearing alignment and gear mesh following installation and include it in routine wear inspections.