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The Hope T-Rex ratio expander allows you to upgrade your existing 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.
Shimano and SRAM specific 40T sprockets have been designed, this gives us the following benefits which wouldn’t be possible with a larger sprocket size or with a universal type design…
Buy Hope T-Rex Expander Sprocket from Chain Reaction Cycles, the World's Largest Online Bike Store.
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