Both bikes are the same size (54cm); both fit equally well. I also have a 1977 Centurion Pro-Tour (in blue) that is a nice match for the orange 1977 Semi -Pro. I'm leaning toward keeping both Semi-Pros in the short run; I do need to move something along for space and domestic tranquility reasons. The 1984 Specialized Stumpjumper Sport seems to be edging it's way towards the door...