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Hope T-Rex Expander Sprocket

Item #: CS225B00
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USD$84.99 12% off USD$96.99 msrp
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Hope T-Rex Expander Sprocket

The Hope 40T-Rex Expander Sprocket provides 10 speed junkies the option of big toothed cogs at a fraction of the cost of an entirely new drivetrain. This 40T cassette expander replaces one of the smaller cogs (usually the 17T) to convert your 11-36T cassette into an 11-40T; it’s really that simple. Medium to long cage rear derailleurs are preferable, but an included 20mm B-Tension screw should get you going if your standard B-Tension screw is not long enough. The Hope 40T-Rex Expander Sprocket will allow you to expand your gear range without requiring new freehub bodies, shifters, and rear derailleurs.

Hope T-Rex Expander Sprocket Specifications

  • 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
  • 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
  • Hard anodized 7075-T6 aluminium
  • Weight: 74g

Hope T-Rex Expander Sprocket Compatibility

  • Shimano XT and XTR 11-36 10spd cassettes
  • SRAM PG1030, PG1050 and PG1070 11-36 cassettes
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REVIEW SNAPSHOT®

by PowerReviews
Hope TechnologyHope T-Rex Expander Sprocket
 
4.6

(based on 5 reviews)

Ratings Distribution

  • 5 Stars

     

    (4)

  • 4 Stars

     

    (0)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Attractive (4)
  • Durable (3)
  • Easy to install (3)
  • Lightweight (3)

Cons

    Best Uses

    • Mountain biking (5)
      • Reviewer Profile:
      • Avid cyclist (5)
      • Was this a gift?:
      • No (5)

    Reviewed by 5 customers

    Sort by

    Displaying reviews 1-5

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    5.0

    I can climb!

    By luker

    from Fort Myers, FL

    About Me Avid Cyclist

    Verified Reviewer

    Pros

    • Attractive Design
    • Durable

    Cons

    • Difficult To Install

    Best Uses

    • Mountain Biking

    Comments about Hope Technology Hope T-Rex Expander Sprocket:

    Love it. I had some initial teething issues getting my XT shadow to shift correctly. Probably because it's a bit beat up. But my LBS dialed in in perfectly. Feels proper and I can climb stuff I was walking before.

    • Was this a gift?:
    • No
     
    5.0

    Hope quality

    By da799

    from Atlanta, GA

    About Me Avid Cyclist

    Verified Buyer

    Pros

    • Attractive Design
    • Durable
    • Easy To Install
    • Lightweight

    Cons

      Best Uses

      • Mountain Biking

      Comments about Hope Technology Hope T-Rex Expander Sprocket:

      Great piece of kit.
      It was surprisingly easy to instal and helps out.
      It didn't make it easy riding up hills, but it made it easier

      • Was this a gift?:
      • No
       
      5.0

      Works great

      By Doe Boy

      from Los Angeles, CA

      About Me Avid Cyclist

      Verified Reviewer

      Pros

      • Attractive Design
      • Lightweight

      Cons

        Best Uses

        • Mountain Biking

        Comments about Hope Technology Hope T-Rex Expander Sprocket:

        I have a 2x set up on my Intense Tracer 2. I do a lot of climbing and prior to installing the hope expander, the rear gear ratio wouldn't get low enough, making climbs more difficult. After installing the expander, I immediately noticed a substantial difference in climbing. It changes gears real well.

        • Was this a gift?:
        • No
         
        5.0

        Very nice retrofit

        By pjc

        from Boise, ID

        About Me Avid Cyclist

        Verified Buyer

        Pros

        • Attractive Design
        • Durable
        • Easy To Install
        • Lightweight

        Cons

          Best Uses

          • Mountain Biking

          Comments about Hope Technology Hope T-Rex Expander Sprocket:

          After switching to a 2 x 10 drivetrain and 29" wheels last year, I've always felt like I was missing that last granny gear. This solves that issue.

          I easily installed it to a SRAM 1050 cassette, paired to a SRAM XO medium-cage derailleur. The shifting is smooth. It hasn't had any issues pushing up to that extra big ring, and releases to a higher gear easily. I opted to do away with my 17t cog and it's been a good fit overall.

          • Was this a gift?:
          • No
           
          3.0

          Almost good

          By CT Rider

          from Connecticut

          About Me Avid Cyclist

          Verified Buyer

          Pros

          • Easy To Install

          Cons

          • Limited Compatibility

          Best Uses

          • Mountain Biking

          Comments about Hope Technology Hope T-Rex Expander Sprocket:

          Tried to get it working smoothly but gave up after two rides. It doesn't play nicely with my preferred rear derailler (Shimano Zee FR). Couldn't adust for perfect shifts. It might be my bike frame and the mounting geometry.

          • Was this a gift?:
          • No

          Displaying reviews 1-5

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          Free Shipping Offer

          Get free Standard Shipping with your $50 purchase today! Just choose Standard Shipping during checkout.

          Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items.