[Reasty15]

Hi all  just after some component advice with regards changing my 105 groupset to GRX.   I ride a Trek checkpoint ALR 5 I am looking to change my crank (50/34) and cassette (11-34) to an 11 speed 1-11 set up. I have recently changed my rear mech to an Ultegra RX clutch mech. I do most of my riding  now off road.

My question is  what sized crank and cassette can I upgrade to? I have workd out that I will need to add a rear mech hanger to support  larger cassette without changing my rear mech. Any help is greatly appreciated.

Many thanks in advance.

 

 

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[Reasty15]

Thanks very much for advice,

Thanks very much for advice, much appreciated. 

[Drinfinity]

Daughters CX bike is running

Daughters CX bike is running 11-42 11 speed on the back with an Ultegra mech, and no Goat link. I didn’t think it was possible either!

[huntswheelers]

Guess it’s what you want to
Guess it’s what you want to achieve….RX will max comfortable to 36 up back without a wolf tooth or similar….. You need to check out some gravel bike/bikepacking sites for inspiration….. I’m on a Sram Apex, 10 Speed CX bike ( Gravel spec’d ) on Panaracers with 46/34 front, 11/36 up back on a GX mech which will run to 42 ….with 46/34 and 11/36 it’s 25 gear inches on inner and 36…. MTB are typically 18 gear inches for off road….this gives me 113 gear inches on road…..

[Secret_squirrel]

Official Max Cassette teeth

Official Max Cassette teeth for that Mech is 34t – whether you can exceed that depends on the hanger (I presume a Road-link or similar) and your b-screw.

Its not clear what you mean by crank.  If you are changing your crank to a 1x GRX one then their 1x cranks come with a 40t chain ring. Its not clear if other chain rings are available.

https://bike.shimano.com/en-EU/product/component/grx-11-speed/FC-RX600-1.html

 

[Author]

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