As part of their ERS system, Eibach ERS helper springs prevent the main spring from loosening in the spring seat when your suspension is unloaded or at full droop. They have very little spring rate, and therefore no effect on suspension characteristics. Up to 2 in. (50mm) of spring-to-perch gap can be covered with the use of a helper spring. Order the Eibach ERS helper springs designed to fit your application.