The World's Largest Online Bike Store
    • Hope T-Rex Expander Sprocket

        • $77.99 77.99
        • RRP $97.00
        • Save 20%
    • Select Teeth
      Select Colour
      Select Option

Hope T-Rex Expander Sprocket

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…


  • Precise matching of the tooth profiles and shifting points specific to each cassette
  • Perfect mating of supporting tabs reducing flex and aiding shift performance
  • Lower B-tension adjustment is needed ensuring good shifting throughout the cassette range compared to fitting a 42t


  • Shimano version compatible with XT and XTR 11-36 10spd cassettes
  • SRAM version compatible with PG1030, PG1050 and PG1070 11-36 cassettes
  • 7075-T6 aluminium
  • CNC machined in Barnoldswick, England

Buy Hope T-Rex Expander Sprocket from Chain Reaction Cycles, the World’s Largest Online Bike Store.

  • Delivery cost $9.99
  • Delivers toUnited States of America
  • 365 Days return or exchange

    If you're not completely satisfied with an item you may return it within 12 months of purchase. We'll give you a full refund if the item hasn't been used or fitted.

    More information on returns
  • Pay by Bank Transfer, PayPal or Card


  • Colour: Gold, Black, Silver
  • Option: Shimano, SRAM
  • Teeth: 40t
  • Speed: 10 Speed

Cassettes Buying Guide

  • We've got everything you need to know in our buying guide.

When buying Cassettes also consider...

Also Recommended...