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Renthal Ultralight Rear Sprocket - 520 Chain Pitch x 51 Teeth - Blue - 224U-520-51GPBU 2008 Aprilia SL 750 Shiver 75mm CD Style Rings forRenthal Ultralight Rear Sprocket All rear sprockets are the ultralight design, making them 66 percent lighter than steel, yet incredibly durable They are CNC machined from a specially enhanced 7075 T6 aluminum alloy This sprocket will provide maximum power transfer and long life Renthal Ultralight rear chainwheels are manufactured to extremely tight tolerances from 7075 T6 aluminium alloy which is 66% lighter than steel, yet incredibly durable. Their