I wouldn't buy a bike without throwing a leg over it. I'm 5' 11'' with a 32" inseam. A previously-owned Bottecchia 57cm road bike felt a bit compact. In a pinch I recently borrowed a buddy's 15 y.o. 54cm Sirrus and it felt really small. My current 2016 Scott hybrid is an XL. Other than the standover height being a bit higher than I'd prefer, the frame is a good fit.