Hi, i know absolutely nothing about road bikes but i am thinking it is time i tried one as i ride one of my mountain bikes on the road a lot and im sure a road bike would be more efficient. I have no idea what size i need but i am 6ft 2" and ride a 19-21" mountain bike. I am watching a few cheap ones on Ebay but would prefer one from here, i dont mind if it needs work i like a project. Thanks for any help.