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You've only gone and opened that can of worms.
It depends on a number of factors, including your preferred cadence, whether it's for training or racing, riding conditions and so on.
Having gone for a 42 on mine, I'm now wishing I'd got a 38 instead.
Just don't buy a red anodised one as that is for tarts.
andyp
who22
biarittz
For 1 x 10, what's a decent cassette x chainring combination?
e.g.
42 x 11-25
ta.