How to Understand Bicycle Sizing

The average rider can find a decent bike at the local department store. But if you're going to do some serious riding, either competitive or recreational, finding the right size bike is very important. Understanding the different elements to consider when sizing a bicycle will help you find the best comfort and speed for whatever type or riding you do. Read on to learn how to understand bicycle sizing.

Difficulty:

Moderately Easy

Instructions

1. Understand how the frame size is measured. Frame size is determined by the length of the seat tube, the tube that runs from the pedals to the base of the seat. You'll need to know exactly how this is measured to get an accurate size. Some will measure from the center of the pedal base to the top of the seat base while others will measure from the same bottom point to the point where the seat tube crosses the top tube. There are also other variations on this measurement so be sure to clarify exactly how this measurement is taken.

2. Consider the length of the top tube. Bicycle sizing used to be based only on the frame size but some professional riders consider the length of the top tube to be more important. The top tube runs from the base of the seat to the handlebars and can be horizontal or slanted. The length should be based on the length of the rider's upper body and arms, as it will determine how far the handlebars will be from the seat and will affect the rider's posture on the bike.

3. Adjust the seat position and handlebar position together. These will be determined by the type of riding you do. If you ride for recreation your seat and handlebars should be at about the same height, making for a more upright position. If you ride for speed, the position of the seat moves up and forward and the handlebars move down to provide a more aerodynamic position. This will allow your feet to provide more support for your body and not put so much pressure on your hands. Handlebars should be about the width of your shoulders.

Tips & Warnings

• A good bike shop owner will be knowledgeable in bike sizes and how to find the best fit for you. Take the time to work with a professional to get the best results.