Mugen Seiki MRX4 On-Road Brake Disc MRX4-21/GO by 3Racing  [MRX4-21/GO]

MRX4 Brake Rotor Details

This brake disc is supplied as an RC-scale replacement for Mugen Seiki MRX4 and MRX4-R chassis and carries part number MRX4-21/GO. It is intended as a direct-fit spare to repair or alter rear braking components on 1/10 scale on-road cars that share the MRX4 mounting pattern.

Installation notes: ensure the rotor is coaxial with the hub and tighten fasteners to match your hardware guidelines, replacing any fatigued items. Fit and check one side first for runout, then fit the other side and confirm smooth rotation before completing drivetrain assembly. Routine MRX4 hand tools are sufficient for this fitment.

Tuning role: swapping discs influences brake pedal feel and modulation at the wheel, which affects choices for brake bias and differential tuning on track. Install matched pairs and perform brief tests to observe stopping consistency and corner entry response.