Ofcourse, before you being, you need to know the correct size of the bike (bike sizing). From one of the posts on ebay: Your inseam is more important than your height. To find the proper size bike, you need your inseam measurement. This isn't your pants size but something you will actually measure. This works a lot easier if you have help. Take your shoes off, stand with your back against a wall, with your feet about 25cm (10") apart and raise a book at least an inch thick firmly against your crotch. Make a mark on the wall at the top of the book. Subtract 9" - 10" (23cm - 25cm) for a road bike and that is the frame size you need.
Here are 3 sites with good info:
- http://www.edinburgh-bicycle.co.uk/resource/size_charts.htm
- http://eriksbikeshop.com/site/page.cfm?PageID=39
- http://www.jimforeman.com/Stories/bikefit.htm
- Cannondale Geometry Chart
- New Cannondale Geometry Chart
More findings later..