Bump Spring Cup 14mm 1.280 Cup Step OD

The Bump Spring Cup 14mm 1.280 Cup Step OD by ALLSTAR PERFORMANCE is a precision suspension component engineered for off-road vehicles, race cars, and custom builds that require adjustable bump stop tuning. This aluminum bump stop cup serves as the critical interface between your suspension spring and frame, controlling compression resistance and ride harshness during extreme travel events. Whether you're upgrading a short-travel suspension system or fine-tuning an existing setup, this component delivers repeatable damping characteristics essential for both street and competition applications.

Constructed from black anodized aluminum, the Bump Spring Cup 14mm features a 2-inch outer diameter (OD) with a 1.28-inch inner diameter (ID) and measures 0.4 inches tall, providing optimal load distribution across a 1-inch bump spring. The 14-millimeter through-hole design allows secure mounting while accommodating standard fasteners found in most suspension architectures. The stepped cup profile ensures positive spring seating and prevents lateral migration during suspension cycles, while the anodized finish resists corrosion and wear in both wet and dry environments. This precision engineering minimizes deflection and maintains consistent spring preload over thousands of compression cycles.

Ideal for fabricators, suspension specialists, and performance enthusiasts building custom independent suspensions or upgrading factory systems, this bump stop cup integrates seamlessly into double-wishbone, A-arm, and multi-link configurations. The compact 0.12-pound weight ensures minimal unsprung mass addition while the robust aluminum construction handles extreme g-forces without permanent deformation. Installation requires only basic fastener tools and fits within standard 14-millimeter mounting bosses found on most custom frame fabrications and suspension kits.