Bump Spring Cup 1.63in ID x .625in Shaft

The Bump Spring Cup 1.63in ID x .625in Shaft by Eibach is a precision suspension component engineered for coilover systems and performance suspension setups. This bump stop cup serves as a critical interface between the coilover spring and the vehicle's suspension frame, designed to control spring movement and protect against excessive compression. Whether you're building a street performance car, track-focused platform, or upgrading a lowered suspension system, this component ensures consistent spring seating and dampens impact loads during aggressive driving or rough road conditions.

Engineered to Eibach's exacting specifications, the Bump Spring Cup features a 1.63-inch inner diameter paired with a .625-inch shaft diameter, providing a secure fit within most coilover spring configurations. The robust cup design distributes lateral and vertical loads evenly across the suspension assembly, minimizing stress concentration and extending component lifespan. At just 0.19 pounds, this lightweight cup integrates seamlessly into performance suspension systems without adding unnecessary weight to the vehicle's unsprung mass. The compact dimensions (3.95 x 0.7 x 4.15 inches) allow for straightforward installation in tight suspension mounting areas common to modern chassis designs.

Mechanics and enthusiasts upgrading coilover suspensions will appreciate the precision engineering that Eibach delivers with this bump spring cup. Compatibility depends on your specific coilover system—verify that your setup calls for a 1.63-inch ID cup with a .625-inch shaft before ordering. Installation requires proper suspension support and is best performed by experienced technicians or in a professional shop environment. This component is ideal for owners of cars undergoing suspension modernization, lowering projects, or track preparation, where proper spring location and bump stop function are non-negotiable for safety and performance.