Yokomo RD/SD/MD Top Shaft Upgrade RD-631  [RD-631]

Yokomo RD-631 jp
Price:
AUD$21.78
Brand:
Yokomo
Model:
RD-631
GTIN:
639342231065
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RD, SD and MD series aluminum replacement shaft

This aluminum top shaft is an RC-scale replacement part designed for Yokomo RD, SD, and MD series drivetrains. It maintains compatibility with the conventional Y2-631 top shaft while featuring an expanded D-cut to accept lightweight spur gear hubs such as RD-630BK, RD-630BL, RD-630P, and RD-630R.

Choose this shaft when you want a reliable aluminum upgrade that preserves hub fitment with low-mass gear sets during tuning and track preparation. The component is intended for standard top shaft replacements and will not modify drivetrain routing.

Specifications

  • Item: Aluminum top shaft
  • Material: Aluminum
  • Model Number: RD-631
  • Compatibility: Compatible with RD, SD and MD series top shafts, fits conventional top shaft Y2-631, wider D-cut to accept RD-630BK RD-630BL RD-630P RD-630R lightweight spur gear hubs, supports listed chassis models

Compatible Models

  • MDR-010
  • MDR-010A
  • MDR-010LTS
  • MDR-020
  • MDR-020CE
  • MDR-030
  • RDR-010
  • RDR-010-1
  • RDR-010G
  • RDR-010G2
  • RDR-010G2-1
  • RDR-020
  • SDR-010
  • SDR-010LTS
  • SDR-020
  • SDR-030
  • DP-RS13SP
  • DP-FCBN

The RD-631 is recommended when a precision-machined aluminum top shaft and broader D-cut clearance are needed to fit lightweight spur hubs for chassis tuning and refinement.
Remark :
Due to limited stock availability, please notice that some Yokomo items may have to order from the factory and the ready time is around 4-6 weeks. Customer purchases the item is assumed to accept the waiting time which allows us to order directly from the manufacturer if the item is out of our warehouse.

How will the RD-631 affect handling when I fit lightweight hubs?

Fitting low-mass hubs on the RD-631 can reduce rotating inertia, which may deliver crisper throttle response and slightly quicker spool-up of drivetrain components.

Is the RD-631 suitable for competitive tuning work?

Yes. Its machined finish and hub clearance make it a practical choice for competitive setups that use lightweight spur gear hubs to trim rotating mass.

Will I need special hardware to install this shaft?

No special hardware is required for standard installations; the RD-631 is made to match the Y2-631 form factor for straightforward swaps.

Does the RD-631 require break-in or special maintenance?

Routine inspection for secure hub seating and occasional lubrication where applicable is recommended; no special break-in procedure is necessary.

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