I've tested a Trek 7.3 22.5" and a 7.5 20", each at different shops. Each one told me the size I rode was good for me. I couldn't tell much difference after 5-10 minutes on each. About 3" clearance from the bar as I straddle the smaller bike, 1-2" on the larger bike. I'm 6'1" tall with 33" inseam. I don't know which size to buy. I'll likely get the 7.5 because of the upgraded hardware. Any feedback is appreciated. Looking forward to riding ASAP!