While the Eibach ERS system provides a huge range of spring rates and suspension travel, there are always racing applications that require specially designed components. Our suspension engineers enjoy the challenge of creating unique designs that overcome special geometry, special weight challenges, or unusual design characteristics.For example, all Eibach springs used by top-running teams in Formula 1, the famous WRC (World Rally Championship) , Le Mans/GT, and many Touring-Car Series are custom designed and manufactured. As an example the extreme conditions and long-travel suspension performance found in todays off-road race vehicles often require multiple progressive characteristicsa tough assignment for a lesser spring manufacturer, but a welcome challenge for Eibach.. Uncountable individual combination possibilities to create from standard spring components ex stock High spring travel (deflection) and therefore high end loads at short mounting lengths Block resistanceSurface treated through shot-peening High dynamic durability (component longevity) Precise tolerances High quality corrosion protection by phosphating and epoxy coating Individual protective packaging Easy identification (imprinted with Part no.-indicates spring rate and physical dimensions) Race Main Spring Block Height 2.65in ID 2.50in Length 7.00in Load Block Height 1 525lbs Rate 350lbs/in Travel 4.35in Images used may be generic. Actual product may vary.