Seller notes

Renthal Twinring Sprockets Black Unique flat face design keeps weight to a minimum and means the TwinRing's as narrow as a regular chainwheel. 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. Inner Ring is high-strength, ultra-light 7075 T6 Aluminum Outer Ring is Electroless Nickel Coated steel, expanded at 200 Degree C and then fitted to inner, creating a permanent bond ...

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