Renthal Ultralight Rear Sprocket - Silver - 51T 150U-520-51GBSIRenthal Ultralight rear chainwheels are manufactured to exteremly tight tolerences from a special material developed to withstand the rigours of Supercross, Motocross and Enduro. The 7075 T6 aluminium alloy rear chainwheels are 66% lighter than steel, yet incredibly durable. Their advanced tooth profile, concentricity and accuracy of fit provide maximum power transfer and long life. Renthals combination of a very high strength base material and an
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