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Renthal 520 Twinring Heavy Duty Rear Sprocket Black - 51T - 1540-520-51GPBK


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  • 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 extremely tight tolerances
  • Flat socket head screws add additional strength to the chainwheel during side impacts
  • Self-cleaning mud grooves between every tooth on both sides help prevent dirt build up