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@Dammit
I'm going to pop out and try the course with 52X14, if I can push it up the hill then it would be 140 rpm for 41mph down to the finish, which I reckon should be ok.
Size- I've got a position which seems to work on the 58cm Langster- but with a 60mm stem.
I think a 54cm might be the one to use, although I'd certainly have a seatpost like a broom stick at that point.