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@magnuswinwick
I have this hub on my Twenty I'm on 44x25 which is plenty.
In top gear it is the equivalent of 52x12 on 700c
The bottom gear is about the equivalent of 42x32 on 700c
If I were you I'd go with 44T, the hub is on the list in Sheldon's gear calculator, so you can compare it to what you know.
http://sheldonbrown.com/gears/