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Twinring Sprockets DESCRIPTION Manufacturer: Renthal MPN: 1540-520-49GPBK Title: Twinring Sprockets Size: 49T Option: Rear Color: 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 Electro...

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