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Hope T-Rex Expander Sprocket

USD$79.99 20% off USD$100.20 msrp
Item #: CS225B00
USD$79.99 20% off USD$100.20 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

REVIEW SNAPSHOT®

by PowerReviews
Hope TechnologyHope T-Rex Expander Sprocket
 
4.4

(based on 10 reviews)

Ratings Distribution

  • 5 Stars

     

    (7)

  • 4 Stars

     

    (1)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (0)

89%

of respondents would recommend this to a friend.

Pros

  • Attractive (9)
  • Lightweight (8)
  • Easy to install (7)
  • Durable (5)

Cons

    Best Uses

    • Mountain biking (10)
      • Reviewer Profile:
      • Avid cyclist (8)
      • Was this a gift?:
      • No (10)

    Most Liked Positive Review

     

    Why is this not the standard?

    This should just be what bikes come with. I mounted it up with a 2x10 setup with a 22/32 up front, all X7 stuff on a salsa Hosethief and a king hub....Read complete review

    This should just be what bikes come with. I mounted it up with a 2x10 setup with a 22/32 up front, all X7 stuff on a salsa Hosethief and a king hub. With the proper tools it was a snap to install. If you are running a 2x10 like me you may find chain length an issue going small to small, but you should not run that combo anyway. I do miss the gap the missing 17 tooth creates cruising on a fire road or pavement every now and again but the benefits of a 40t outweigh the missing 17 for the way i like to ride here in the Phoenix, AZ area. This just needs to be the standard.

    VS

    Most Liked Negative Review

     

    Poor durability

    The other day, I went to wipe down my chain and noticed an alarming number of metal flecks. After only about 20 crash-fee rides, the teeth are chipping and the edges are becoming...Read complete review

    The other day, I went to wipe down my chain and noticed an alarming number of metal flecks. After only about 20 crash-fee rides, the teeth are chipping and the edges are becoming too sharp.

    While it was easy to install, the material just seems to be either too soft or too brittle.

    Reviewed by 10 customers

    Sort by

    Displaying reviews 1-10

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    5.0

    XC races

    By ao hammer

    from Chino Hills CA

    About Me Competitive Cyclist

    Verified Reviewer

    Pros

    • Attractive Design
    • Durable
    • Lightweight

    Cons

      Best Uses

      • Mountain Biking
      • Racing

      Comments about Hope Technology Hope T-Rex Expander Sprocket:

      So far so good. I have two bikes with this cog and 1x10 setups. The hardtail for local XC races in dusty, rocky conditions (i.e. Southridge) and fully on local trails. Both no problems with teeth wear, shifting, nor hub fit so far. I run this with an XX1 crankset, have not experienced any durability issues so far. Loving it!

      • Was this a gift?:
      • No
       
      5.0

      Great Product

      By Luke

      from Bellingham, WA

      About Me Avid Cyclist

      Verified Reviewer

      Pros

      • Attractive Design
      • Easy To Install
      • Lightweight

      Cons

        Best Uses

        • Mountain Biking

        Comments about Hope Technology Hope T-Rex Expander Sprocket:

        Picked this up as part of a 1x10 upgrade from my stock 3x9. Using with a Race Face 32T NW ring up front, Shimano mid cage shadow clutch derailleur and XTR shifter. The missing 17T isn't noticeable and the jump to the 40T is very smooth. I ride everything from cross country to aggressive all mountain and this new setup provides a sufficient range of gears for the way I ride.

        • Was this a gift?:
        • No
         
        4.0

        Why is this not the standard?

        By Jimfab

        from Phoenix, AZ

        About Me Avid Cyclist

        Verified Buyer

        Pros

        • Attractive Design
        • Durable
        • Easy To Install
        • Good Idea
        • Lightweight

        Cons

        • Loose A Taller Gear

        Best Uses

        • Mountain Biking

        Comments about Hope Technology Hope T-Rex Expander Sprocket:

        This should just be what bikes come with. I mounted it up with a 2x10 setup with a 22/32 up front, all X7 stuff on a salsa Hosethief and a king hub. With the proper tools it was a snap to install. If you are running a 2x10 like me you may find chain length an issue going small to small, but you should not run that combo anyway. I do miss the gap the missing 17 tooth creates cruising on a fire road or pavement every now and again but the benefits of a 40t outweigh the missing 17 for the way i like to ride here in the Phoenix, AZ area. This just needs to be the standard.

        • Was this a gift?:
        • No

        (1 of 1 customers found this review helpful)

         
        2.0

        Poor durability

        By pjq6

        from Boise, ID

        About Me Casual/ Recreational

        Verified Reviewer

        Pros

        • Attractive Design
        • Easy To Install
        • Lightweight

        Cons

          Best Uses

          • Mountain Biking

          Comments about Hope Technology Hope T-Rex Expander Sprocket:

          The other day, I went to wipe down my chain and noticed an alarming number of metal flecks. After only about 20 crash-fee rides, the teeth are chipping and the edges are becoming too sharp.

          While it was easy to install, the material just seems to be either too soft or too brittle.

          • Was this a gift?:
          • No
           
          5.0

          Value Value Value

          By The Beard

          from Corona CA

          About Me Avid Cyclist

          Staff Reviewer

          Pros

          • Attractive Design
          • Clean
          • Easy To Install
          • Lightweight
          • Precise

          Cons

            Best Uses

            • Mountain Biking

            Comments about Hope Technology Hope T-Rex Expander Sprocket:

            I purchased this ring because I needed just a little bit more from my 1x10 and the previous cassette ring i had did not fair well. Smooth shifting, great looking, and easy to install.

            When using this ring you must use at least a mid cage derailleur. Depending on your suspension design and placement of derailleur you may or may not need the longer b-tension screw.

            Mach 6 carbon 38t chain ring, mid cage derailleur did not need the b-tension screw.

            Great buy right here.

            • Was this a gift?:
            • No
             
            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 1-10

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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.