Shimano Ultegra CS-R8000 11-25T Casette (11speed)11-12-13-14-15-16-17-19-21-23-25TWeight: 232 gr. Shimano Ultegra CS-R8000 11-25T Casette (11speed)Compatible with HG-EV 11-speed and HG-X 11-speed chainsThe most versatile tooth option. The wide variety of developments is consistent with the concept that Shimano has defined as Rider tuned drivetrain "or transmission adjusted to each rider and offers ratios that are considered suitable for all cycling styles.: 11-12-13-14-15-16-17-19-21-23-25TWeight: 232 gr.