although i havent got a reply from the guys at surly, im anxious to know which one would suit me better and since that my current bike is a mtb im not really sure how to calculate for LHT. therefore i hope that the experts on the board can give me a hand here.

some basic datas, i'm 5'7 and my inseam is about 79.5 mm.

here are 3 sizes(with 26" tires) that im considering, but am not sure as to which to go for. the first number is in inch and the second in millimetre

ST (C-T) TT (C-C) TT (Effec.) S.O. Height
46 cm 18.1 460.0 20.0 508.3 20.3 515.0 28.5 723.8
50 cm 19.7 500.0 20.7 525.1 20.9 530.0 29.8 756.9
52 cm 20.5 520.0 21.1 534.8 21.3 540.0 30.5 775.1

btw, im going to put on mustache handlebar in the future so i think the top tube should be shorter. or it donest matter that much?