Ultegra CS-R8101 12-Speed Cassette Size:11-34T your shoe stays put

your shoe stays put

so they added lactase to digest all the milk sugar

gluten free

Recommend Installation: Rear

And to prevent paint or carbon from getting scratched

Ultegra CS-R8101 12-Speed Cassette Size:11-34T your shoe stays putHYPERGLIDE+ cassettes revolutionized off road shifting with its seamless shifts both up and down the gear range. Now it's time for the technology to change road cycling. Even during maximal efforts up a climb or racing a friend, riders no longer need to back off to perform a shift. In any gear, Shimano ULTEGRA R8150 drivetrains maximize efficiency thanks to larger cogs and retain compatibility with existing HYPERGLIDE FREEHUB bodies. All this while