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

Mugen Seiki MRX4 /Mugen Seiki MRX4-R Brake Disc - 3Racing MRX4-21/GO
Price:
USD$9.40
Brand:
3Racing
Model:
MRX4-21/GO
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Performance Brake Disc for MRX4

This brake disc is an RC-scale replacement engineered for Mugen Seiki MRX4 and MRX4-R chassis and identified as part MRX4-21/GO. It is supplied as a direct-fit spare to service or tune rear braking components on 1/10 on-road platforms that employ the MRX4 mounting pattern.

Installation notes: re-check rotor concentricity at the hub and apply correct torque to mounting fasteners, replacing any hardware that shows fatigue. Fit one side and measure runout before assembling the opposite side, then confirm free rotation under hand power before reconnecting the drive train. Standard MRX4 tooling suffices for this procedure.

Tuning role: selection of disc profile and thickness affects initial bite and modulation at the wheel hub, which in turn guides brake bias and differential tuning for lap-to-lap consistency. Use matched components and incremental track testing to quantify changes in stopping behaviour and cornering entry.

Which MRX4 variants are supported?

The disc is produced to the MRX4 bolt pattern and supports both MRX4 and MRX4-R rear hub assemblies.

How should I verify fitment accuracy?

Measure lateral runout after initial fit and confirm even spacing on both sides; replace any bent or worn mounting hardware prior to final torque.

Recommended procedure for setup testing?

Fit matched discs, perform controlled short runs, then adjust brake bias and diff settings in small increments to assess on-track braking balance.