by Kevin Saunders

Created on: August 07, 2009

How do you know a bike fit is right? This is the second question I usually get, the first one being, "I don't need a bike fit or a new bike, because I fit my bike just fine." The question of whether a bike fits or not has been asked for decades and at the end of the day, the answer does not lie completely in the field of "art" or "science." For me, I feel that there is both a science to determining what is right for a person and an art to working with the person to get the desired results. So the answer to the question is, "You don't know if a bike fit is right unless you find a better way to determine what "right" is."

Most bicycle fit programs and protocols revolve around an optimal set of dimensions and angles derived from a large test pool of individuals. The bike fitter then attempts to find the crucial measurements from the rider and then attempts to use the dimensions or angles provided in his or her fitting system to apply those complimentary dimensions to a bicycle. The term "fit me to a bike" is most appropriate because for most of the people in the world, they are trying to find the best compromise in comfort and efficiency to make a particular bicycle useable.

In the case of a single speed commuter bike in Copenhagen Denmark, the difference of an inch or two in saddle height may make no appreciable difference. The bike will still get you to work. In the case of a 21 year old professional Criterium specialist, the requirements for accuracy in fitting go up but the ability of a young body to adapt is quite high as well, so many different setups are going to be ok.

When a 40 year old woman who is switching from running to cycling and wants to do a triathlon, the fit requirement is just as important for the bike racer, with two caveats.

1) A 40 year old woman is not going to ride in the same position that a 21 year old full time bike racer would. The range of acceptability shrinks each year. Not only that, injuries and conditions such as scoliosis make the range even narrower.

2) Many people who get serious about cycling as an adult have no idea what a good bike fit feels like because they have never experienced it.

My example for this situation is as follows: Molly is 6 years old and in the first grade. She has trouble reading the letters and words on the blackboard and the other people in class don't. What Molly doesn't know is, she needs glasses and the others don't. Molly thinks that some other reason exists for her difficulty because she

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