EVERYONE: Remember that Giant has compact frames. So, a 50cm Giant is equivalent to a 55-57cm non-compact frame and supposedly fits riders between 5'7" and 5'10" (I say "supposedly" because as we all know, everyone is different).

That being said, I tried a full Cervelo carbon bike with DuraAce a couple weekends ago. What a nice ride!!! More bike than I need though - I don't race and don't intend to race. Such a nice looking bike and rode and shifted so smooth . . . sigh . . .

Definitely get a professional fit though.