Looking for some input. My wife is 5'3 and about 120lbs and I am looking at a Cannondale R1000 Feminine. It is a 50cm bike. She road a trek 52cm at the bike shop because they said that is what fit, but every bike fits different. Its used and it is out of town. I just don't want to make a wasted trip. Any thoughts on size and what is a 2006 Cannondale R1000 Feminine worth. She wants to start riding with me and I hate to pay for a new bike if she doesn't like road riding.