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@pauly1978
I've just checked on my road bike: That's got a 50t up front and I tend to stick in the 16t on the rear when riding on the flat stuff.
According to this helpful table http://www.bikecalc.com/gear_inches 50x16=82.3 gear inches.
My options are either a 52 or 40 on the front, then for the fixed hub on the rear (keeping as close to 82.3 as possible) my options are:
52x16=85.5 or 52x17=80.5
OR
40x12=87.6 or 40x13=81.0
Then go slightly bigger for the freewheel side? So if I go for 52x16 fixed and 18 freewheel?