Compatible with Mugen Seiki MRX4 6mm Main Shaft 7075 Upgrade - MRX4-12/TI by 3Racing  [MRX4-12/TI]

6mm 7075 main shaft summary

This 6mm main shaft is supplied as a direct drivetrain replacement or an upgrade option for Mugen Seiki MRX4 and MRX4-R scale touring chassis. It installs into the final drive train to carry spur and pinion loads while transmitting torque from the gearbox to the wheels.

In service the shaft keeps the drivetrain concentric and resists normal wear during racing and practice sessions. When fitting a replacement, confirm bearing alignment and gear engagement, spin the assembly to check for smooth rotation, and inspect mating surfaces for any signs of wear.

For setup work this 7075 aluminium shaft balances stiffness with serviceability and acts as a reliable datum when adjusting gear mesh and checking backlash. Inspect the shaft periodically for burrs, scoring, or deformation to maintain consistent gear engagement and limit drivetrain losses.

Use this part when a direct replacement or a like-for-like upgrade is required for MRX4/MRX4-R drivetrains; always check bearing fit and gear mesh after installation and treat the shaft as a routine wear item during maintenance.