• 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