volosong

Assuming you're talking road bikes . . . I also am 6'3" and have no difficulty finding a frame that fits fine. The bike on which I had a pro fit is a 57.5cm Pinarello. I've matched all my other bikes to the measurements on that bike. Some of my other bikes are 58 or 59 cm frames, and they are set up the same as the Pinarello FP-6. I have four Pinarello bikes and find them the most stable and comfortable, (for me). The stems that seem to work best for my body shape are 110 mm or 120 mm. But as alluded to, what works for you depends on how long your torso and arms are. This is just what works for me.