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@smiff
that makes my knees hurt just thinking about it. that is 85 gi (700x23).
for commuting and being a man about town i am loving 42/17 - 65 gear inches with 700x23c.
i live in crystal palace and my knees were starting to suffer on 42/16 (69 gi) on the hills.
i tried 42/18 (when i had to swap wheels with my other bike in emergency) and found it too spinny (61.4 gi).
so i switched the rear spocket to 17 and i think that might be the right balance. is still a bit spinny on the flat, but a bit easier on the knees and nice acceleration and control at low speed. easier to trackstand too.