FK Bump Cup 2.125" ID

Requires Snap Ring 389-510.

The purpose of a bump rubber cup is to keep the bump rubber from expanding and deforming. When the bump rubber cannot expand, its effective spring rate is progressively increased. Use this bump rubber cup on the left rear for wingless racing to tighten the car on exit. Proper timing is important.

HYPER RACING’S GOLD STANDARD: Components marked with the gold H-Mark logo are part of Hyper Racing’s Gold Standard lineup, recommended for X4–X11 600cc Micro Sprint Chassis. Each one is tested and proven to deliver the highest level of performance, giving you confidence that you’re running parts built to meet our standard.