Yokomo YOKYS7B Damper O-Ring Stop Part  [YOKYS7B]

O-ring end-stop for shock absorbers

This compact rubber O-ring works as a down stop within RC damper and shock assemblies, supplying a predictable cushion when the shock compresses fully. It is suited for setups where an O-ring stop is used to reduce harsh bottoming of the piston or shaft.

Fitting is generally simple: position the O-ring on the shock shaft or on the lower seating area per your damper design, then cycle the shock to confirm the chosen down-stop effect. Always double check shaft size and clearances because shock designs vary across models.

In tuning sessions the O-ring offers a subtle change to bottoming feel and can be part of a tuning strategy alongside springs and oils to refine compression and rebound. Replace when the rubber shows visible wear, cracking, or permanent deformation to maintain stable performance.