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The @Chalfie shaped conundrum we have is that you've not raced cross on gears, so we can't look at any real data to ascertain whether a 38, 40 or 42 is best for you.
But with those ratios I'd go 38, it'll give you a decent lowest gear for uphill training and a good range at the higher end for most cross races, even dry ones.
andyp
@Chalfie
12-27 is what I've got kicking around. On old road wheels. I fancy riding these till they die. Or I do.