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How to Measure a Road Bike Stem

by
author image Willard Peveler, Ph.D.
Willard Peveler is an assistant professor of exercise science at Northern Kentucky University and is the author of "The Complete Book of Road Cycling and Racing." He has coached cycling at the collegiate level and triathlon for Team in Training. His research involves factors affecting performance in cycling and triathlon.
How to Measure a Road Bike Stem
How to Measure a Road Bike Stem Photo Credit Joe Irizarry/Demand Media

Stem length is one aspect of a road bike that you can alter to increase both comfort and performance. In order to alter stem length you must first know the length of your current stem. Stem length, designated in millimeters, may be indicated on the stem. However, most stems are not marked and must be measured in order to determine size.

Measure Bike Stem

Step 1

How to Measure a Road Bike Stem
Photo Credit Joe Irizarry/Demand Media

Stabilize the bike by placing it in a stand or trainer, or by resting it against the wall.

Step 2

How to Measure a Road Bike Stem
Photo Credit Joe Irizarry/Demand Media

Measure from the center bolt of the headset cap to the center of the handlebar in centimeters.

Step 3

How to Measure a Road Bike Stem
Photo Credit Joe Irizarry/Demand Media

Convert the centimeter measurement to millimeters by adding a zero to the end of the measurement.

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