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

Product overview - 6mm 7075 main shaft

This 6mm main shaft is supplied as a direct replacement or performance-minded upgrade for Mugen Seiki MRX4 and MRX4-R touring chassis. It sits in the final drive train to bear spur and pinion loads while transmitting drive from the gearbox to the wheels.

The component keeps drivetrain elements concentric and resists normal wear encountered during racing and club practice. When replacing the original shaft, confirm bearing alignment, check gear mesh and ensure smooth rotation prior to running.

For setup work this 7075 aluminium shaft gives a useful combination of stiffness and serviceability, acting as a dependable reference when adjusting gear mesh and checking backlash. Regular inspections for scoring, burrs, or bends will keep gear engagement predictable.

Choose this part for like-for-like replacement or a straightforward upgrade on MRX4/MRX4-R drivetrains; always recheck bearing fit and gear mesh after installation and treat the shaft as a replaceable wear item.