Tire Size > Wheel Circumference Chart

For the most accurate data from a speed sensor like the Wahoo RPM Speed or Blue SC, measure and input your wheel circumference in the Wahoo Fitness App. An accurate speed sensor can also improve the speed/ distance data accuracy of GPS Bike Computers like the ELEMNT, ELEMNT ROAM, and ELEMNT BOLT, especially in tree cover or near buildings.

Manual Rollout Measurement 

Because wheels of the same "size" come with rims of varying widths, tires of the same "size" will often vary in actual size and tread pattern, and inflation pressure will affect tire circumference, in order to determine most accurate circumference value of your wheel, inflate your tire to the pressure you use when riding and then complete a manual rollout measurement.

Mark a point on the floor/driveway and place your front wheel with the valve stem at the bottom of the wheel at that point. Roll the bike one wheel revolution forward in a straight line, until the valve stem is again at the bottom of the wheel. Mark that spot. Set your bike aside and measure the distance between the two points in metric units, or convert and enter that value in meters. One imperial inch = 25.4mm or .0254 meters.

Tire Size > Wheel Circumference Approximation Chart

For a near approximation of wheel circumference, you can find tire size written/molded into the side of your tires. Find that tire size in the chart below and enter the corresponding value in meters.

Please see Setting Up Wheel Circumference for detailed instructions and additional information.