Optimised response characteristics and large reserves create very good road adhesion for great grip and high comfort. These suspension struts with reservoirs permit infinite adjustment of the spring pre-tensioning, a 22-position adjustment of the traction level. The classic version complies with what is "normal" but has a black spring instead of a blue one. Approval: ABE operating licence (Germany only). As an option, the suspension struts can be ordered at extra cost with height adjustment (629) and/or hydraulic spring pre-tensioning by means of a handwheel (625). Wilbers products can be used for repairs and maintenance.