To get accurate results from a speed sensor like the Wahoo RPM Speed or Blue SC, input your wheel circumference in the Wahoo Fitness App. An accurate speed sensor can also improve the accuracy of GPS Bike Computers like the ELEMNT, ELEMNT ROAM, and ELEMNT BOLT, especially in tree cover or near buildings.
You can find tire size on the side of your tires. Tire circumference may vary depending on tire pressure. Properly inflate your tires for the most accurate results.
Please see Setting Up Wheel Circumference for detailed instructions and additional information.
| Tire Size | Circumference in Meters | Circumference in mm |
ISO |
| 700 x 18C | 2.07 | 2070 | 18-622 |
| 700 x 19C | 2.08 | 2080 | 19-622 |
| 700 x 20C | 2.086 | 2086 | 20-622 |
| 700 x 23C | 2.096 | 2096 | 23-622 |
| 700 x 25C | 2.105 | 2105 | 25-622 |
| 700C Tubular | 2.13 | 2130 | |
| 700 x 28C | 2.136 | 2136 | 28-622 |
| 700 x 30C | 2.146 | 2146 | 30-622 |
| 700 x 32C | 2.155 | 2155 | 32-622 |
| 700 x 35C | 2.168 | 2168 | 35-622 |
| 700 x 38C | 2.18 | 2180 | 38-622 |
| 700 x 40C | 2.2 | 2200 | 40-622 |
| 700 x 44C | 2.235 | 2235 | 44-622 |
| 700 x 45C | 2.242 | 2242 | 45-622 |
| 700 x 47C | 2.268 | 2268 | 47-622 |
| 650 x 20C | 1.938 | 1938 | 20-571 |
| 650 x 23C | 1.944 | 1944 | 23-571 |
| 650 x 35A | 2.09 | 2090 | 37-590 |
| 650 x 38B | 2.105 | 2105 | 40-584 |
| 650 x 38A | 2.125 | 2125 | 40-590 |
| 12" x 1.75" | 0.935 | 0935 | 47-203 |
| 12" x 1.95" | 0.94 | 0940 | 54-203 |
| 14" x 1.50" | 1.02 | 1020 | 40-254 |
| 14" x 1.75" | 1.055 | 1055 | 47-254 |
| 16" x 1.50" | 1.185 | 1185 | 40-305 |
| 16" x 1.75" | 1.195 | 1195 | 47-305 |
| 16" x 2.00" | 1.245 | 1245 | 54-305 |
| 16" x 1-1/8" | 1.29 | 1290 | 28-349 |
| 16" x 1-3/8" | 1.3 | 1300 | 37-349 |
| 18" x 1.50" | 1.34 | 1340 | 40-355 |
| 18" x 1.75" | 1.35 | 1350 | 47-355 |
| 20" x 1.25" | 1.45 | 1450 | 32-406 |
| 20" x 1.35" | 1.46 | 1460 | 35-406 |
| 20" x 1.50" | 1.49 | 1490 | 40-406 |
| 20" x 1.75" | 1.515 | 1515 | 47-406 |
| 20" x 1.95" | 1.565 | 1565 | 50-406 |
| 20" x 1-1/8" | 1.545 | 1545 | 28-451 |
| 20" x 1-3/8" | 1.615 | 1615 | 37-451 |
| 22" x 1-3/8" | 1.77 | 1770 | 37-501 |
| 22" x 1-1/2" | 1.785 | 1785 | 40-501 |
| 24" x 3/4" Tubular | 1.785 | 1785 | |
| 24" x 1" | 1.753 | 1753 | 25-520 |
| 24" x 1-1/8" | 1.795 | 1795 | 28-540 |
| 24" x 1-1/4" | 1.905 | 1905 | 32-540 |
| 24" x 1.75" | 1.89 | 1890 | 47-507 |
| 24" x 2.00" | 1.925 | 1925 | 50-507 |
| 24" x 2.125" | 1.965 | 1965 | 54-507 |
| 26" x 7/8" Tubular | 1.92 | 1920 | |
| 26" x 1.25" | 1.95 | 1950 | 32-559 |
| 26" x 1.40" | 2.005 | 2005 | 37-559 |
| 26" x 1.50" | 2.01 | 2010 | 40-559 |
| 26" x 1.75" | 2.023 | 2023 | 47-559 |
| 26" x 1.95" | 2.05 | 2050 | 50-559 |
| 26" x 2.00" | 2.055 | 2055 | 52-559 |
| 26" x 2.1" | 2.068 | 2068 | 54-559 |
| 26" x 2.125" | 2.07 | 2070 | 57-559 |
| 26" x 2.35" | 2.083 | 2083 | 58-559 |
| 26" x 3.00" | 2.17 | 2170 | 75-559 |
| 26" x 1-1.0" | 1.913 | 1913 | 25-559 |
| 26" x 1" | 1.952 | 1952 | 25-571 |
| 26" x 1-1/8" | 1.97 | 1970 | 28-590 |
| 26" x 1-3/8" | 2.068 | 2068 | 37-590 |
| 26" x 1-1/2" | 2.1 | 2100 | 37-584 |
| 27" x 1" | 2.145 | 2145 | 25-630 |
| 27" x 1-1/8" | 2.155 | 2155 | 28-630 |
| 27" x 1-1/4" | 2.161 | 2161 | 32-630 |
| 27" x 1-3/8" | 2.169 | 2169 | 37-630 |
| 27.5" x 1.50" | 2.079 | 2079 | 40-584 |
| 27.5" x 1.95" | 2.09 | 2090 | 50-584 |
| 27.5" x 2.10" | 2.148 | 2148 | 54-584 |
| 27.5" x 2.25" | 2.182 | 2182 | 57-584 |
| 29" x 2.25" | 2.281 | 2281 | 58-622 |
| 29" x 2.1" | 2.288 | 2288 | 54-622 |
| 29" x 2.2" | 2.298 | 2298 | 56-622 |
| 29" x 2.3" | 2.326 | 2326 | 60-622 |
