I'm looking at a used cannondale tri bike.

The Frame size is 50cm I am 5'5. I know the best thing to do is go get measured but I'm kinda on a time crunch since it's a used one. Is this approx. the right size bike for someone this height? I know it's not a given since everyone is sized differently, (torso etc) but do you think my chances are good it can be tweaked to fit?