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Renthal 2240-520-48GPBU Twinring Heavy Duty Rear Sprocket - Blue - 48T track-systems-idler-wheel Yamaha FJR1300A ABS 2004-2005Marketing Color: Blue Material: Aluminum Sprocket Position: Rear Sprocket Size: 520 Sprocket Teeth: 48 Unique flat face design keeps weight to a minimum and means the TwinRing is as narrow as a regular chainwheel. Inner Ring is high strength Ultralight 7075 T6 Aluminum. Outer Ring is Electroless Nickel Coated steel. Outer is expanded at 200C and then fitted to inner, creating a permanent bond for the life of the sprocket. Precision CNC machined to