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Renthal Grooved Rear Sprocket - 520 Chain Pitch x 38 Teeth - Silver - 223A-520-38GESI feed-mpn-02-8660 2010 KTM 250 XCF-W ChampionsRenthal Grooved Rear Sprocket These are the longest lasting sprockets on the market They are CNC machined from a specially enhanced 7075 T6 aluminum alloy Machined self cleaning mud grooves at each tooth to help increase wear resistance This sprocket will provide maximum power transfer and long life Renthal's combination of a high strength base material and exceptionally hardwearing surface result in significantly increased chainwheel life over other