Renthal Twinring Rear Sprocket KTM SX SXF EXC EXC F 91 26, Husky TC FC TE FE 14 26 Gas Gas MC EC EX 21 26, Triumph TF 250 450 X E 25 26 Orange Number of Teeth:51 Optimum design for light weight Optimum design for light weight and strength All fiber plates use organic non abrasive materials to avoid damage to rest of motor as plate materials break down and are circulated through engine by oil manufactured to OE specs using high quality materials The result is a lightweight dual material design combines a hardened steel outer chain ring that is heated to 200°C before being perminantly fitted to our Ultralight aluminum inner