Just over 6', and I have a 23" mountain bike, 61 cm road bike, and 63 cm road bike all setup for me comfortably. The 63 cm is my favorite, however. 5'11 on almost any 50 cm frame is going to be pretty cramped. Before I knew better, I rode a 54 cm for a bit and couldn't believe the difference in comfort and performance when I switched to a bike that fit me. Night and day difference.