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Hope Technology

Hope Technology T-Rex Ratio Expander Sprocket

From £49.99
Was From £60.00
Save From £10.01(17%)
Hope Technology T-Rex Ratio Expander Sprocket
Hope Technology T-Rex Ratio Expander Sprocket
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Hard Anodised 7075T6 Aluminium
Adapts a 11-36 10spd Cassette
Gives An 11-40T Range
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Key Features

Q & A


With the popularity of 1 x 10 drivetrains having really taking off and the search for the perfect ratio seems to be a never ending search of Hope and despair, Hope have released this 40 tooth range expander as a way of getting the ratio of an 11 speed groupset on your beloved 10 speed set up at an affordable price!

The Hope T-Rex sits neatly and perfectly behind your cassette an allows you to have a nice super spinny gear for those long mega steep climbs. Hope have designed two types of T-Rex, one to work with Shimano and one to work with Sram cassettes.

The T-Rex will only work if you are using a 10 speed cassette on which you can remove the 17 tooth cog.

Compatible Cassettes

Shimano XT and XTR 11-36 10spd cassettes.

Sram PG1030, PG1050 and PG1070 11-36 cassettes.


1. Unscrew the lockring on your freewheel and slide you cassette off.

2. Remove the 17 tooth cog from the cassette.

3. Slide T-Rex Ratio Expander cog onto freehub.

4. Slide the cassette back on minus the 17 tooth cog.

5 Replace and tighten lockring.

6. Align derailleur using longer B Limit screw which is included.

7. Get a brew and admire your handy work.

Please Note: Lower B-tension adjustment is needed ensuring good shifting throughout the cassette range compared to fitting a 42t.

Have you also considered?
SRAM X9 PG1070 10 Speed Cassette   Shimano Deore XT M771 10 Speed Dyna-Sys Cassette
SRAM X9 PG1070 10 Speed Cassette   Shimano Deore XT M771 10 Speed Dyna-Sys Cassette
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