There isn't one built up surly in Chicago, which seems odd, so no way to test ride. I did test out a 56 Specialized Tri cross and it fit pretty well it has a 56 TT and 56 ST. The 56 crosscheck has a 56 ST but a 57 TT. The 54 crosscheck has a 54ST and a 56TT.
I'm looking for a bike to use for commuting and light touring so comfort is a bigger concern than racing. So I'm trying to get a more upright position.
I don't know if it would be better to get the 54 and add spacers to the stem to raise the bars up or get the 56 and a shorter stem to compensate for the longer TT?
I've never really ridden road bikes so I have no real comparisson, my rough measurements are height 5'11, cycling inseam 32.5"
any help would be greatly appreciated