How to Calibrate a Wireless Speedometer on a Bicycle
A wireless speedometer for your bicycle provides important facts about your riding style, power output, speed and the distances you've traveled, but only if it is set up correctly to work with your style of bike. Most speedometers come with a predesignated set of wheel sizes and bike styles that are accurate for most newer bicycles. Some bike wheels and tires, such as those found on older bikes, are not included in the list and the wireless bicycle speedometer must be calibrated manually.
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Instructions
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1
Set the bicycle up on a work stand or balance it on its handlebars and seat to remove the front wheel. Take the front wheel off the bicycle by loosening the axle nuts with a 14mm or 15mm wrench or by loosening the quick release and pulling the wheel out of the drop outs.
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2
Lay out a sheet of banner paper at least three meters long on the floor. Mark the tire with the marker and draw a line on near end of the banner paper. Line up the tire marking with the marking on the paper.
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Roll the wheel forward from this starting point until the mark you made on the tire touches the paper again. Mark this point on the paper and reattach the wheel to the bicycle with the axle nuts or quick release.
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4
Measure the distance between the two marks on your paper with a tape measure that measures in millimeter increments. Write down this measurement.
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Hold the "setup" or "reset" button of your speedometer, which is usually found on the back of the computer face, until the screen clears and opens the setup dialog. Select the options you want through the setup dialog of your speedometer until you reach the "wheel size" designation. Input the measurement you took on the banner paper and finish choosing your options. This will calibrate the speedometer to your wheel size.
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