Can i fit a 34 tooth cassette?

amboman

Hi i got a gravel bike (giant revolt 2) for chrimbo, it has Sora 9 speed groupset but an FSA sub compact 48t chrankset.
I have a spare 105 11speed groupset with an ultegra gs rear mech
If i wanted to upgrade it to the 11 speed would i be able to use a 11-34 cassette?
Many thanks in advance and happy xmas and new year.

chippyk

Shimano say a GS mech goes up to a 32, I’d say you’d probably get away with it.

amboman

Thank you. Working on the theory it has a sub compact crankset losing 2 teeth on that i think it would be possible but wanted to ask

StillGoing

amboman wrote:

Hi i got a gravel bike (giant revolt 2) for chrimbo, it has Sora 9 speed groupset but an FSA sub compact 48t chrankset.
I have a spare 105 11speed groupset with an ultegra gs rear mech
If i wanted to upgrade it to the 11 speed would i be able to use a 11-34 cassette?
Many thanks in advance and happy xmas and new year.

Ultegra GS maximum sprocket size is 32 teeth.

lesfirth

I have done it with 10 speed 105GS rear mechs on two bike builds . It needed a bit of B screw fiddling before it worked OK.
The frame / gear hanger have an effect so the only way to find out is to try it.

amboman

philthy3 wrote:

amboman wrote:

Hi i got a gravel bike (giant revolt 2) for chrimbo, it has Sora 9 speed groupset but an FSA sub compact 48t chrankset.
I have a spare 105 11speed groupset with an ultegra gs rear mech
If i wanted to upgrade it to the 11 speed would i be able to use a 11-34 cassette?
Many thanks in advance and happy xmas and new year.

Ultegra GS maximum sprocket size is 32 teeth.

But it came with 9 spd sora gs rear mech (which shimano say is max 32t) with an 11 -34t cassette fitted.

vegasfoster

I've seen using longer B screws, flipping the B screw to the other side so it sticks out further, and roadlink https://www.wolftoothcomponents.com/products/roadlink I can't vouch for any of it though.