Eibach ERS 70mm ID Linear Tender Spring Norma Martinez. Renowned for our extensive catalog of over 1,500 precision engineered race springs. Eibach race springs offer unparalled customization and performance optimization across a wide spectrum of racing applications. From shocks to pull bars we offer a wide range of springs solutions to fine tune the handling dynamics of your race car. Installation Instructions Installation Instructions Provides a Softer Initial Rate When Paired with a Main Spring Highest Linearity and Guaranteed Consistency Available in Linear or Progressive Rates Each Spring Individually Tested