Hope T-Rex Ratio Expander Sprocket 40T Black Shimano
The Hope T-Rex ratio expander allows you to upgrade your existing Shimano 11-36 10spd cassette to give an 11-40T range. The T-Rex simply installs behind your existing cassette and replaces one of the smaller sprockets, usually the 17T. The precise matching of Shimano tooth profiles and perfect mating of supporting tabs reduce flex and aid in shift performance. Made of 7075-T6 aluminum in Barnoldswick, England.