Premium-quality 105mm sprocket 6-hole 52 teeth. 101 Octane Premium sprockets are laser cut in Europe using thermo-mechanically rolled fine-grain steel ALFORM 460 EN 10149 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, Derbi, Gilera, Rieju and Yamaha mopeds. Mounting hole: 8.5 mm Inside diameter: 105mm hole: 6 PCD: 125mm standard: 420 offset: no / Teeth: 52