I am selling my Giant TCR Composite 1. I bought this bike a while ago and I rode it maybe three times. I just couldn't get into it. Great riding bike but I think it's a bit to big for me. It's a Medium/Large which is like most companies 56cm. I am 5'8" and I think a Medium would be better for me. So if you are 5'10" or so this should fit you perfectly.
Here is a link to the bikes original specifications:
Let me know if you have any questions.