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Renthal Twinring Sprocket - 520 Chain Pitch x 49 Teeth - Silver - 1230-520-49GPSI MPN_03-214 2005 Arctic-Cat F 7 FirecatRenthal Twinring Rear Sprocket A long lasting durable off road sprocket developed over 5 years. They are CNC machined from a specially enhanced 7075 T6 aluminum alloy The unique flat face design keeps weight to a minimum and means the Twinring rear chainwheel is as narrow as a standard chainwheel. These feature Renthal's self cleaning mud grooves at each tooth to help increase wear resistance The flat socket head screws add additional strength to the