First, select a bike that fits you. This is done by checking standover height. A quality shop will have experts help you select the right bike, but you can also check standover height yourself.
Stand straddling the top tube of the bike, in front of the seat. If the top tube goes straight across, you will want about 1" clearance between your crotch and the tube. If the top tube of your bike is sloped, your aim will be 2" of clearance. Wear your cycling shoes when you are checking fit, as they will affect your standover height.
Check out our shop, including our road bike selection at www.bumsteadbikes.com and stay tuned for our next post describing adjustments to your road bike fit.