Fits only the U.S. version with a fork diameter of 35 mm! ! Safety through optimal suspension tuning! Progressive winding of the fork springs ensures optimal performance for road and track use. At low compression, they offer maximum convenience due to the finest response (low breakaway torque). At the same time, if compressed further, the springs enable tight and precise driving for best traction properties and drift protection. To properly adjust the damper to the fork springs we recommend using Wilbers SAE 10 fork oil (Order no. 55040300030) with an air chamber of 150 mm - the viscosity can vary from the original value.