Originally Posted by
trunolimit
Wow you have a good eye. Yes my current bike is to large for me. I'm 5'3" and wear a size 30 inseam. I should have a 53/54 cm bike. This one is well above that. I got it because it was a killer deal and I didn't know any better. I was coming off of a dahon that I road until it literally fell apart. Having the bar low puts strain on my wrist and hurts my back so I raised it so I can have an upright ride. I lug around a well filled backpack so that doesn't help. I like having the lightness of a road bike and the speed...
It' possible that you got the back pain from being too stretched out. This bike would not just be taller than the correct size - 50cm or 52cm would be better for your height - it's also longer in the top tube. Top tube length is the most important dimension for comfort, not stand-over clearance. (I'm 5'-8" and I fit a 53 or 54 cm frame)
Or, you could look at a flat bar road bike such as the Cannondale Quick.