Frostbike: Hope Gives Your Cassette Big Teeth with the 40 T-Rex Adapter


If you’ve been drooling over the recent cassette adapters from OneUp and Wolf Tooth Components lately, but were holding out for a 40 tooth version, Hope has an answer for you. By introducing their 40 T-Rex (40 tooth Range Expander), Hope is looking to take a bite out of the cassette adapter market with their legendary machining capabilities.

Details on the T-Rex and much more after the jump.


Originally, Hope says that they started with a 42t adapter like most of the competition. In their opinion the 40t ended up working out better as far as the jump between the 36 and 40/42 and it needed less B-tension adjustment so they canned the 42t in favor of the 40t only. Machined out of 7075 aluminum, the T-rex will be sold in Shimano or SRAM specific versions which will be installed without the need for spacers. Like all the other models, you will jettison the 17t cog to make room for the 40t.


At 74g the T-rex is fairly light, and will retail for $90 in black, silver, and gold ano.


Hope has also been making their Retainer rings for a bit which use a narrow-wide tooth pattern to aid chain retention. Available in a 30t version with threaded posts, or 32,34,and 36t 104 BCD rings that retail for $75.


As stems trend shorter and top tubes get longer, Hope saw the need to offer an even shorter stem like the new 35mm one shown here. Their shortest stem ever, it is also available in 50mm and retails for $123.



Finally, Hope has been doing their Press Fit bottom brackets which thread together in the center for bb86, so now they are introducing a model for PF30. since the shell threads together in the center in addition to the press fit, they claim much greater durability without any noise or creaks.


pornitswhatlwouldratherbmaking - 02/23/14 - 12:27am

will it work with a short cage rd?

Tad - 02/23/14 - 12:39am

Awesome on the 40t!!! I’ve been wanting to get one but the 42’s seem to be too much and never sold me.

Spennywrench - 02/23/14 - 12:46am

^ It probably will work, but not well. Simple medium or GS would be much better with a single front ring!!

Hayden Davis - 02/23/14 - 3:34am

I have seen it done with a shorty. I’d recommend a medium with a 1×10 setup though.
Just got a wolftooth GC running with a SRAM X0 Type 2 and a narrow wide ring. Results are good.

hogdog - 02/23/14 - 6:38am

I’ve been waiting for a 40 tooth, 36-42 is too big a jump, good work Hope.

EM2 - 02/23/14 - 7:43am

General Lee 40t can save your 17t cog .
Use a gear calculator app and you will see , if you find that the 40/33/28 are big jumps then you are not ready to go signle .

Reformed Roadie - 02/23/14 - 8:24am

Are they making them in purple?

Brian - 02/23/14 - 10:45am

Has anyone had experience with their PF bottom brackets?

Mindless - 02/23/14 - 12:29pm

Spenny- Gs IS medium cage. Sgs is long- cage.

Nick L - 02/23/14 - 1:11pm

Does anybody make a 38T adapter?

dougiee - 02/23/14 - 4:04pm

@hopgdog 36 to 42 is the jump on both xx1 and xo1 both of those shift perfectly and don’t feel too large.

grog - 02/24/14 - 1:17am

damn, I was hoping they’d release that cassette/freehub unit that had a smaller low end, instead of an adapter. oh well.

Jerome - 02/24/14 - 12:45pm

@dougiee: yes, but it’s with a dedicated derailleur. Here, we’re speaking about a standard derailleur. Other testers (see here: assessed that a 40t is better suited to a 1×10 conversion than a 42t.

Jared Adams - 02/24/14 - 9:13pm

What is the availability date of the 40 T-Rex?

Kyle - 02/27/14 - 10:36am

I want! When and where are they available?

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