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  • Hope T-Rex Expander Sprocket
  • Hope T-Rex Expander Sprocket
NOW$87.49
  • RRP$97.00
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Shimano
SRAM
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40t
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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…

Features:

  • 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

Specification:

  • 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.

  • Colour: Gold, Black, Silver
  • Option: Shimano, SRAM
  • Teeth: 40t
  • Speed: 10 Speed
 
Rated 5 out of 5 by 12 reviewers.
Rated 5 out of 5 by Quality from Hope again I first purchased the e thirteen 42 tooth cog and have found that very temperamental and needing set up after every ride.This version from Hope has been very smooth and took no time to get fitted and working it also puts a lot less load on the rear mech. Riding the two I've found no major difference in the two gears and would recommend the Hope between the two. 10 September 2014
Rated 5 out of 5 by Nice Piece of Kit Bought this as an option when I changed my rear cassette and also went to twin ring on the front. Really easy to install as comes with spacer forged into the ring itself and give you that last bit of peddle power when your near the top and your legs are a bout to give in. Great Product 06 August 2014
Rated 5 out of 5 by Like having new legs. I had gone 1x9 for a while before taking the financial plunge and upgrading to 1x10 with the T-Rex on an XT cassette with a Zee mech. Life is so much less of a struggle now with a good spread of ratios as well as a simple, light setup. 31 July 2014
Rated 5 out of 5 by all the climbing you need. I live in cairns Australia, we have recently had the world cup here which means I get to ride a world cup track when ever I want. I was having trouble getting my 13 kg plus jekyll up some of the climbs, I run a 1x10 with a 32 front. With the addition of the. T-rex I can now climb the whole thing with out busting my poo poo valve, which means I can enjoy the downhills even more. I did have to get a new chain as the old one wasn't long enough which you will notice as shifting to and from the bigger sprocket won't work. Other than that put it on and spin away! 11 June 2014
Rated 5 out of 5 by Awesome little upgrade Just paired this to a blackspire narrow wide chain ring and so far has been perfect though not sure how ill get on a steep climb yet. i got the black one has lost a bit of the colour on the teeth after a couple or rides but that is only cosmetic nice lite gaphc on the back. I was a little concerned with how loosely it fitted a hope pre evo2 cassette body but once all tightened up it was fine, its also really easy to set up with the sram x9 mech 02 June 2014
Rated 5 out of 5 by Usual Hope Quality I ride in the Peak District & Holmfirth area with some severe climbs that I used to have to push up until I fitted this to my 10speed XT cassette. I also changed the 11sprocket to a 13. The 10speed sprockets are now 13,15,17,19,21,24,28,32,36,40 which works brill for this area. My bike is a Genesis 29er with double chainring. Hope this helps. 27 May 2014
Rated 5 out of 5 by Climb climb climb Great piece of kit if your going 1x10. Gives you that extra oomph needed on those long steep climbs! The specific shift ramps for shimano or sram makes shifting flawless 25 May 2014
Rated 5 out of 5 by Oh yes!!!! Fit one today!!! I decided to upgrade to a 1x10 and this is the icing on the cake. Very well made, syncs perfectly with the shimano xt cassette, chain and medium cage xt mec. Only problem is matching it with correct cassette. Have a look on hopes web site before ordering as you may need to upgrade the cassette to fit this little gem. 18 May 2014
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6 Questions : 8 Answers

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5 months, 2 weeks ago
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Answer: 
A SRAM Medium Cage should have enough capacity to run the 40T-Rex sprocket, yes. Full fitting and adjustment instructions can be found here - http://cdn.hopetechnology.netdna-cd...
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Answer: 
yep exactly as i have it removed the 17t adjeusted the b screw works fine no need to adjust the chain either
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2 answers

compatibility with 3x10 setup

Hi, Is this sprocket compatible with a shimano xt 3x10 setup? Cassette is Shimano xt 11-36

thanks
pavlos
3 months, 1 week ago
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Answer: 
These extender rings are designed for use on a 1x10 or 2x10 setup; you would need a very long chain to suit a 3x10 setup with this ring, and may have trouble taking up the slack when dropping onto the smaller chainrings. It would not be suggested for use with a triple setup.
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Answer: 
Yes, I believe it is. You will have to loose one of the smaller rings when you fit it
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Answer: 
This sprocket is compatible with the Shimano M980 and M771; also SRAM 1030, 1050 and 1070 cassettes.

A longer chain may be required but in most cases the derailleur will handle the chain movement without any issues (note that the derailleur must have at least a 29tooth capacity). The wide ratio/Freeride variant of this derailleur has a max capacity of 36tooth and can run this expander sprocket.

More info on what is compatible and setup can be found here - http://lnk.nu/cdn.hopetechnology.ne...
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Answer: 
'Cassette expanders' are currently only designed and intended for use with 10-speed drivetrains.
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Answer: 
The Wide Ratio (Free Ride) version of the Zee M640 has ample capacity to run this sprocket assuming that a front chainring no larger than 32tooth is being used (ideal).

For the frame on which is it being used; no longer than 25mm of chain growth is ideal.
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I have a short cage XO 10 speed rear derailleur and am running 1x10.
Is it possible to fit a 40T T-Rex expander sprocket or do I need a medium cage to achieve this?
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Answer: 
It depends on the chain growth of your frame; a short cage derailleur should work on the 40t ring (42t will always require Medium Cage) as long as the frame has less than 25mm of chain growth.

To check the chain growth of your suspension ask the manufacturer or follow the steps below
- Measure the distance between the rear axle and crank axle.
- Deflate the rear shock and cycle the suspension to find and measure the spot in the travel where this distance is the longest
- The difference between these numbers is the chain growth of your suspension

Personally, I would err on the side of caution and move up to a Medium Cage derailleur anyway.
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