When my wife had her bike built, a Co-Motion, I was a little bit concerned by the standover height. My wife was used to a compact frame, and did not know how a more traditional frame would work out. The owner of the company did the fit and after I built the bike up we went back to their shop to discuss the fit. He thought the fit was OK and to go ahead and take it on a tour we had planned. He also said, "that if she did not like it they would build her another one". That kind of service is hard to beat! She loved it, and the fit is great. She is short (5'3") riding a 47 cm frame, and proper fit has always been a problem. In her case a custom frame, while not an absolute necessity, solved many previous fit issues.