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

Shock spring cup overview

This is an RC-scale shock spring cup designed for use with Yokomo R12/GT series touring car shocks. The component secures the spring on the shock shaft and provides a defined contact point for preload and travel adjustments. The part is intended for precise positioning rather than changing spring rates, and it complements standard shock rebuild and tuning routines.

Installation is straightforward: remove the shock cap and threaded collar as required, position the cup on the shock shaft seating surface, then reassemble ensuring the spring seats squarely. Use appropriate small hand tools and check for any play after tightening. No special press is required for standard assembly on compatible shock bodies.

Tuning notes: changing cup height alters effective spring preload and the initial travel stop, which affects ride height and transient response. Make small incremental changes and test on-track to evaluate handling effects. Regular inspection for burrs or deformation keeps consistent spring seating and repeatable setup results.