JT Sprockets - Rear SteelJT Rear Sprockets are manufactured using only the finest grade of super hard, ultra durable, high carbon C49 steel. This steel has been tempered using JTs heat induction technology to achieve material hardness that last up to 6 times longer than the best aluminium sprockets. No other aftermarket rear steel sprocket is made from this high carbon C49 material most use weaker C45 steel. The heart of JT Sprockets and their durability, is the material used
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