Sprocket - Drive - Rear - 520 - JTR2012 Series - 42 Tooth - America - Speedmaster

JT Sprockets are computer designed to achieve ultimate strength while retaining as little weight as possible. Made from C49 high carbon steel alloy - they meet or exceed all possible industry standards and have indeed become an industry standard in themselves. Remember to always replace sprockets and chain as a set. Running a new sprocket or chain in an otherwise worn out system will only cause premature wear - further expense and headache.