Shimano 105 CS-R7101-12 Cassette - 11-34T, 12-Speed

From sprinting on the flats to climbing steep inclines, the 11-34T cassette has you covered. It is compatible with both SHIMANO 11-speed and 12-speed FREEHUB bodies. Refined 12-step gear combination provides peak efficiency and accelerating performance for every situation Compatible with new 12-speed and road 11-speed FREEHUB body Ratios: 11-12-13-14-15-17-19-21-24-27-30-34T SHIMANO 105 R7100 series · part number CS-R7101-12 A stretched chain wears a new cassette quickly, so it's worth having the chain measured when you replace one. If you're not sure which freehub your wheel has, bring it in and we'll check.