- Adapts a 11-36 10spd cassette to give an 11-40t range
- T-REX ring installs behind existing cassette, replacing one of the smaller sprockets, usually 17t
- Shimano and Sram specific tooth profiles and shifting
- Compatible with: Shimano XT and XTR 11-36 10spd cassettes as well as Sram PG1030, PG1050 and PG1070 11-36 cassettes


