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@chillipepper
my regular gear here in cornwall was 99", there is a course on the Lizard that has some very steep bits so dropped to 93, 94" or something, i chose a gear based on the time I wanted to do on a course.. so say I wanted to do a 21 or 22min '10' I'd need to average 27mph say, so I looked at a cadence of around 115 for that meaning I could go faster, up to say 140rpm on the bits that went down, and slower, say 85rpm on the up bits.. or slower out the saddle if it was steep.. which is how I settled on 99".. It did mean beasting it a bit but it seemed to work pretty well as a rule most of the time.