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Renthal 520 Twinring Rear Sprocket 51T Green Kawasaki KX250F/KX450F Product Details The longest lasting most durable off-road sprocket you can buy developed over 5 years. The unique flat face design keeps weight to a minimum and means the TwinRing's as narrow as a regular chainwheel. Inner Ring is high strength ultralight 7075 T6 aluminum Outer Ring is electroless nickel coated steel that's expanded at 200 degrees Celsius and then fitted to inner ring, creating a permanent bond for the life of t...

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