Anyone upgraded a shimano 105 11-28 to 11-34?

[UEX]

Wondering how painful it would be? I have a full 105 r7000 groupset (I think apologies if wrong terminology) 52/38 and 11-28. I live in mad hilly part of Wales and am considering a wider range for the real beast hills.

I'm riding a full carbon canondale supersix with planet x carbon wheels if it matters. Rim brakes.

 

[UEX]

Consider trying to find someone to swap your chainset with to a 50-34 too. PResume you mean 52-36, but usually they're a bit more in demand than 50-34 so may be able to do an easy swap.

Hmmm I'd rather not do that as I specifically chose a bike with a 52-11 gear for speed. My hybrid only had a 48-13 as highest and I was spinning on the flats.

So on the shimano 105 derailleur I wouldn't be able to mount the bigger cassette im guessing