Shimano Ultegra CS-R8101 12-Speed Cassette Size:11-34T Compatible with HG 12-speed chain

Compatible with HG 12-speed chain

without compromising fit

And what makes this daypack really special is the reflective yarn woven into the polyurethane-coated fabric

Medium/Large fit

Shimano Ultegra CS-R8101 12-Speed Cassette Size:11-34T Compatible with HG 12-speed chainNew tooth profile designed to work with both electronic and mechanical Shimano drivetrains. Tooth profile slightly changed to better accomodate mechanical shifting For Di2 and Mechanical Shifting Systems Refined 12 step gear combination provides peak efficiency and accelerating performance for every racing situation Faster, smoother shifts under maximum pedaling force Compatible with new 12 speed (HG Spline L2) and road 11 speed (HG 11) freehub bodies