I'm about to pull the trigger on this frame, but not sure on which size to go with. I'm 5.5 1/2" or almost 5.6"(67cm), inseam of around 31". If you're around my height which size did you go with? I've always liked a smaller framed bike to throw around, but just don't know if the 15.5 is too small. I have a Trek Superfly in a 27.5" and have the 15.5", but it's pretty maxed out seatpostwise and not sure I could get much more out of it. I feel just a slight bit cramped on it, but the next size up just seemed way too big.