Hi All, I'm looking to pick up new road frame & fork. Right now I'm riding a 58cm frame that is a little too big. The top tube is 575mm horizontal with a 70mm stem (-7 deg rise) on the current set up. Current bike is set up pretty well for me (just did 75 miles with no upper body pain). Top of bars are level with saddle.
Question: is transferring dimensions simply horizontal top tube length + stem length? So if I found a new frame with a 565mm top tube length would I most likely need an 80mm stem? 560mm TT + 85mm stem, etc.
Is it really that simple?