Compact to bigger chainset - Shimano (lazy thread)

Pat Kavanagh

This is the type of question which annoys myself - 'why doesn't the guy just google it?' But maybe I can get a quick answer here and also a possible deal .
I'm thinking of changing my Ultegra compact chainset (110 bcd) for a 130 bcd chainset.
The question is, what's the smallest inner chainring I can get on the 130, and where are the good on-line deals.
Secondly, anyone want to swap a 170 crank 130 bcd for my compact - it's ultegra in good condition? It's one of the more modern ones with the hollow spindle.

100Suns

Are you changing cranks to fit bigger rings? You can get bigger rings to fit on a 110 bcd. You don't need to change the cranks to go to a 53 for instance. I'll dig out the name of the French manufacturer's website if you want to check out different sized rings for 110 bcd.

Pat Kavanagh

Hey, I never thought of that. It makes sense and would be easy to reverse - thanks, and looking forward to info if you can get it.

seamus

Just note Pat that many double/compact front mechs have a 16T limit, so if you go for 53T on the big ring, you'll have to upsize to a minimum 37T on the inner ring.

Some Shimano front mechs can handle 20T, but they're rare enough.

Pat Kavanagh

Thanks Seamus.
37 sounds good for innter but I wouldn't envisage going to 53 on the big one. I can't imagine myself ever needing a 53/12!
What would you suggest for Cat 4 racing - middle of the bunch rider.

100Suns

http://www.specialites-ta.com/gb/plateau-syrius.html

The 52 should work with the 37 on a shim dérailleur.

blorg

You can race A4 on a compact 50/34 no problem, although 53/39 is better. What a standard gives you is better front shifting. If you switch dont go smaller than 39 on the small ring, or I guess 38 if you go for a 52 big ring. The closer ratio is a bigger deal than 50 vs 52/53. On the other hand, in many races on a 50 you would never need to front shift anyway, you can stay in it longer.

bcmf

BBB do 110 bcd rings up to 53.

DonalK1981

I would be interested in your chainset/crank. Just for aesthetics mind, have ultegra all over but brakes and chainset, so looking to get it sorted. Not strong enough in the leg dept yet for the double...

Pat Kavanagh

I put in a 38 small ring and that did the job just fine.