Bump Spring Cup 1.63in ID x .500in Shaft

The Bump Spring Cup 1.63in ID x .500in Shaft is a precision suspension component engineered by Eibach, the industry leader in spring technology and ride control solutions. This component sits at the heart of modern coilover systems and adjustable suspension setups, serving as the critical interface between your coil spring and the suspension strut or shock absorber. Whether you're upgrading a street car, fine-tuning a track platform, or refreshing worn suspension geometry, this bump spring cup ensures consistent spring seating and prevents unwanted spring migration under acceleration, braking, and cornering loads.

Engineered to exacting tolerances, the Bump Spring Cup 1.63in ID x .500in Shaft features a 1.63-inch inner diameter and a 0.500-inch shaft designed to work seamlessly with Eibach's spring line and aftermarket coilover kits. The precision-molded cup cradles your coil spring with repeatable accuracy, reducing spring noise and maintaining proper preload stability throughout the suspension's full range of motion. At just 0.21 lbs, this lightweight component contributes minimal unsprung mass—critical for vehicles where suspension response and handling precision matter. The compact 3.5 x 0.7 x 4.1-inch footprint makes installation straightforward during coilover assembly or OEM strut replacement.

Suspension builders, BMW enthusiasts, Porsche tuners, and performance-focused mechanics rely on this component when assembling or maintaining lowered and adjustable suspension systems. If you're running a street-performance coilover setup, upgrading from OEM springs, or restoring suspension geometry after years of hard driving, proper spring cup installation directly impacts ride quality, noise isolation, and long-term component durability. The Bump Spring Cup 1.63in ID x .500in Shaft is an essential OEM-quality replacement for anyone seeking reliability and consistent handling feel across diverse driving conditions and suspension loads.