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Er depends on which crankset you have but if it's something reasonably modern it's very, very likely to be 110bcd unless it's something both modern and stupid. 48t imho is always a good one to go for.
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I put a 46/30 on my caad12. Was a slight faff due to the braze on FD Mount. I did a thread on it, if you’re interested !
Howard
Beams
@greytyke
I've a CAAD 12 and would like to change the outer 52T chainring to something lower. I'm not a big gear grinder.
Does anybody know the bcd? I don't trust myself to measure it properly!