Wheel Size Chart For Bicycle Computer Settings 

Bicycle computers (Bontrager RideTime, Garmin Edge, Wahoo Element, Wahoo Bolt, Hammerhead Karoo, Cateye Padrone, Sigma ROX, etc.) may be paired with a speed sensor. Speed sensors may connect wirelessly via ANT+ or Bluetooth, or may connect via wired connection. Most modern speed sensors connect wirelessly, such as the Bontrager DuoTrap, Garmin Speed Sensor, and Wahoo RPM Speed Sensor.  In addition, numerous bicycle computer programs that may be run on mobile phones (RideWithGPS.com app, Strava app, Trailforks app, Komoot app, Map My Ride app, etc.) also may be wirelessly paired with such speed sensors via ANT+ or Bluetooth. The speed sensor accurately measures the number of tire rotations, which in turn allows the computer to accurately measure both speed and distance traveled. In order to accurately record the number of tire rotations, the computer must know the circumference of the bicycle’s tires. This setting is very important.  The chart below may be used to find the circumference of various size tires (in mm), which can be entered into the settings in bicycle computers and software running on mobile phones. 
It should be noted that many GNSS enabled bicycle computers and/or software running on mobile phones offer a function to “auto calculate” or “auto calibrate” the tire size. That function will only be available if use of a GNSS (GPS, GLONASS, Galileo, etc.) is enabled in the device’s settings. If that function exists on the device, that is generally considered more accurate and optimal compared to entering a number from the below chart. 

To use the below chart, simply locate the tire size using the first or second column, then enter the circumference (in mm) in the appropriate field in the bicycle computer's or mobile device software's settings. If your tire size is not listed, please let a Crossroads Cycling Company sales associate know, and we will be happy to calculate the circumference for you. 

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