Premium-quality 108mm sprocket 6-hole 53 teeth. 101 Octane Premium sprockets are laser cut in Europe using thermo-mechanically rolled fine-grain steel ALFORM 460 EN10149 and therefore have a better, wear-reducing tooth geometry with optimum strength. Laser cutting ensures a significant weight reduction and a unique design. An impact-resistant KTL coating also protects against unwanted scratches. The durability of these sprockets is 2-3 times higher than conventional sprockets. Fits Aprilia RS, RS4, SX, Derbi GPR, Senda DRD and Gilera SMT mopeds. Mounting hole: 6.5 mm Inside diameter: 108 mm hole: 6 PCD: 122mm standard: 420 offset: no / Teeth: 53