Yokomo R12-21SM Medium Rear Side Roll Spring for YRX12 and GT  [R12-21SM]

Yokomo R12-21SM Rear Side Roll Spring Silver (Medium) for YRX12/GT/YR-10
Price:
CAD$4.55
Brand:
Yokomo
Model:
R12-21SM
GTIN:
3888
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Tune YRX12 and GT Handling with the R12-21SM

The Yokomo R12-21SM medium rear side roll spring in silver balances flex and control for drivers wanting crisper turn-in and steadier mid-corner balance. Designed for YRX12 and GT series setups, this spring helps racers dial in predictable handling without compromising chassis feedback.

Balanced Rate for Race-Day Adjustments

The medium rate of the R12-21SM delivers a responsive feel while keeping rear-end movement in check, making it suitable for competitive club racing. It fits a range of Yokomo chassis including YR-10F, GT5-R2, GT5-RS2, YR-R12C3 and similar models so you can match spring rate to track grip.
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.

Which Yokomo chassis will accept the R12-21SM spring?

The R12-21SM is compatible with many Yokomo rear suspension setups, including YR-10F, GT5-R2, GT5-RS2 and YR-R12C3. Check your car's spring seat dimensions to confirm fitment.

How does medium tension change handling on track?

Medium tension provides a compromise between softness and stiffness, reducing excessive roll while allowing enough compliance for traction and predictable weight transfer in corners.

Any tips for tuning with this spring?

Start with stock ride height and sway bar settings, then swap to the R12-21SM and adjust toe or damping in small steps. Note changes on one axle at a time to isolate effects.

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