How do I Adjust a Digital Speedometer Mileage Tool?

A digital speedometer is a great way to keep track of your riding. This little device that attaches to your bike can tell you how fast you're going, how far you've gone, your average speed over time and even how many calories you've burned on your ride. However, a speedometer like this needs to be adjusted properly according to the size of the wheels on your bike. Otherwise, none of these measurements will be accurate. Learn how to adjust your bicycle speedometer and get a good reading on every ride.

Things You'll Need

  • Digital speedometer
  • Tape measure (millimeter increments)
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Instructions

    • 1

      Lift the brake release lever on the right side of the front brake caliper of the bike to open the brake pads slightly. Lower the quick-release lever on the left side of the front wheel hub, then pull the wheel out of the fork.

    • 2

      Measure the outer circumference of the wheel using a tape measure with millimeter increments. Write down this measurement so you don't forget it. For most road bike wheels, the measurement should be between 1900 and 2200 mm.

    • 3

      Slide the hub of the wheel back into the dropouts on the fork and close the quick-release lever on the left side. Lower the brake release lever to set the brake pads back into position.

    • 4

      Refer to the owner's manual that came with your speedometer to determine the step you should take to change the wheel-size setting of the computer. Most often this is done by removing the face of the computer from the handlebars, pressing the Reset button once, then cycling through the available options until "Wheel Size" is displayed on screen.

    • 5

      Input the measurement you took previously into the computer. Save this setting (most often by pressing the Menu button twice) and place the computer back in its bracket on the handlebars. Head out for a ride, and you should see an accurate reading of your speed and other available calculations.