Optimised response characteristics and large reserves create very good road adhesion for great grip and high comfort. These suspension struts permit infinite adjustment of the spring pretensioning, a 22-position adjustment of the traction level. The Classic version is the same as the "normal" version except that it has a black spring instead of a blue one. Approval: with TÜV parts approval certificate. As an option, the suspension struts can also be ordered at extra cost with height adjustment (629) and/or hydraulic spring pretensioning (625). Wilbers products can be used for repairs and maintenance.