Summary: To determine the correct frame size for a bike, stand flat footed on the floor in front of the saddle to measure clearance. Determine the correct frame size with tips from a bike mechanic in this free video on bicycles.
Jeff Moesch has been working in the bicycle industry for nearly 10 years. He started working in Seattle, Washington for various bicycle repair companies in the late 90's. Moesch worked...read more
"Hey, this is Jeff from the Two Wheeler Dealer. Today I'm going to show you how to quickly determine proper frame size when shopping for a bike. The main rule of thumb is going to be your stand over height. Which is, once you stand over the bike, you're going to stand flat footed on the floor right in front of the saddle, and you're looking for a good probably inch and a half to two and a half inches of clearance between your in seam and the top tube when standing over the bike. Definitely the reach is going to be important. If you are too far outstretched, what happens is when you go to make a corner, the furthest hand away is not going to be able to comfortably reach around the corner to make the turn with the handlebars, which could lead to a dangerous position where you--it leads to loss of control and possibly crashing. If it's too short, you're going to be very uncomfortable. You get a lot of tension and pain built up in the back of your neck between your shoulder blades. These are a few things to look for to determine proper frame size when shopping for a bike."
eHow Article: How to Determine the Correct Frame Size for a Bike