YOKOMO R12/GT series Shock Spring Cup - R12-37C for Yokomo  [R12-37C]

Setup and tuning notes

Specifically built for Yokomo R12/GT series touring shocks, this spring cup secures the spring on the shaft and establishes a defined contact point for preload and travel adjustments. The component focuses on accurate positioning to deliver repeatable setup outcomes alongside normal shock rebuild procedures.

To install: remove the shock cap and any threaded collars as needed, place the cup on the shock shaft seating surface, then reassemble ensuring the spring is square and centered. Use small hobby tools and check for any axial play once tightened. Typical installations do not require a press when used with compatible shock bodies.

Tuning impact: moving the cup position alters effective spring preload and the onset of travel limit, affecting ride height and transient reactions. Make small step changes and evaluate the vehicle on-track to dial in handling. Inspect the cup periodically for wear or deformation to keep spring contact predictable.