im 5'5 with inseam 30. im suppose to be riding a 51 at most, but this 53 fits smaller and im comfortable on it. i can flat foot both side with my balls resting on top tube with no discomfortable and still have room to sit down on top tube if i want. i sat on my friend's giro 52.5cm and it feels slightly taller than mine. and my friend with a 50cm cinelli feels like the height of mine. so different manufactures have different feel even though the sizing is says smaller. the 56cm subrosa definitely is tall for me, but riding around the parking lot, for a good 30 minutes just trying things, i definitely feel more confident stopping sooner than on my bike. i can seat skid/stop on the subrosa with ease, but when i try on my bike..my knee feels like it wants to explode.