The Evolution Racing clutch and the Hebo clutch are basically identical in terms of adjustment. The Hebo clutch differs mainly in the clutch linings. The 3-shoe clutch has variable spring preload and comes with 2 sets of clutch springs of different strengths for sport scooters and fine tuning. The big advantage of this kit is that the spring preload can be adjusted via the Allen screw on the back without having to remove the entire drive. Suitable for use with clutch bells with an internal diameter of 107 mm.