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Renthal Ultralight Rear Sprocket - 428 Chain Pitch x 48 Teeth - Silver - 121U-428-48GPSI 2007 Ski-Doo MX-Z 600 HO SDI Blizzard 2012 Harley-Davidson Electra Glide UltraRenthal 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