Tire circumference reference table
Tire size is usually indicated on the side of the tire.
The following table shows standard values for reference purposes only. Actual tire circumference may change depending on the air pressure in the tire and other factors.
| ETRTO | Tire Size | Circum- ference (mm) |
Circum- ference (cm) |
Inches |
|---|---|---|---|---|
| 47-203 | 12x1.75 | 935 | 94 | |
| 54-203 | 12x1.95 | 940 | 94 | 12 |
| 40-254 | 14x1.50 | 1020 | 102 | 14 |
| 47-254 | 14x1.75 | 1055 | 110 | |
| 40-305 | 16x1.50 | 1185 | 119 | |
| 47-305 | 16x1.75 | 1195 | 120 | 16 |
| 54-305 | 16x2.00 | 1245 | 125 | |
| 28-349 | 16x1-1/8 | 1290 | 129 | |
| 37-349 | 16x1-3/8 | 1300 | 130 | |
| 32-369 | 17x1-1/4(369) | 1340 | 134 | |
| 40-355 | 18x1.50 | 1340 | 134 | |
| 47-355 | 18x1.75 | 1350 | 135 | 18 |
| 32-406 | 20x1.25 | 1450 | 145 | |
| 35-406 | 20x1.35 | 1460 | 146 | |
| 40-406 | 20x1.50 | 1490 | 149 | |
| 47-406 | 20X1.75 | 1515 | 152 | |
| 50-406 | 20x1.95 | 1565 | 157 | |
| 28-451 | 20x1-1/8 | 1545 | 155 | |
| 37-451 | 20x1-3/8 | 1615 | 162 | 20 |
| 37-501 | 22x1-3/8 | 1770 | 177 | 22 |
| 40-501 | 22x1-1/2 | 1785 | 179 | |
| 47-507 | 24x1.75 | 1890 | 189 | 24 |
| 50-507 | 24x2.00 | 1925 | 193 | |
| 54-507 | 24x2.125 | 1965 | 197 | |
| 25-520 | 24x1(520) | 1753 | 175 | |
| 24x3/4 Tubular | 1785 | 179 | ||
| 28-540 | 24x1-1/8 | 1795 | 180 | |
| 32-540 | 24x1-1/4 | 1905 | 191 | |
| 25-559 | 26x1(559) | 1913 | 191 | |
| 32-559 | 26x1.25 | 1950 | 195 | |
| 37-559 | 26x1.40 | 2005 | 201 | |
| 40-559 | 26x1.50 | 2010 | 201 | |
| 47-559 | 26x1.75 | 2023 | 202 | |
| 50-559 | 26x1.95 | 2050 | 205 | |
| 54-559 | 26x2.10 | 2068 | 207 |
| ETRTO | Tire Size | Circum- ference (mm) |
Circum- ference (cm) |
Inches |
|---|---|---|---|---|
| 57-559 | 26x2.125 | 2070 | 207 | |
| 58-559 | 26x2.35 | 2083 | 208 | |
| 75-559 | 26x3.00 | 2170 | 217 | |
| 28-590 | 26x1-1/8 | 1970 | 197 | |
| 37-590 | 26x1-3/8 | 2068 | 207 | |
| 37-584 | 26x1-1/2 | 2100 | 210 | 26 |
| 650C Tubular 26x7/8 | 1920 | 192 | ||
| 20-571 | 650x20C | 1938 | 194 | |
| 23-571 | 650x23C | 1944 | 194 | |
| 25-571 | 650x25C 26x1(571) | 1952 | 195 | |
| 40-590 | 650x38A | 2125 | 213 | |
| 40-584 | 650x38B | 2105 | 211 | |
| 25-630 | 27x1(630) | 2145 | 215 | |
| 28-630 | 27x1-1/8 | 2155 | 216 | 27 |
| 32-630 | 27x1-1/4 | 2161 | 216 | |
| 37-630 | 27x1-3/8 | 2169 | 217 | |
| 18-622 | 700x18C | 2070 | 207 | |
| 19-622 | 700x19C | 2080 | 208 | |
| 20-622 | 700x20C | 2086 | 209 | |
| 23-622 | 700x23C | 2096 | 210 | |
| 25-622 | 700x25C | 2105 | 211 | |
| 28-622 | 700x28C | 2136 | 214 | |
| 30-622 | 700x30C | 2146 | 215 | |
| 32-622 | 700x32C | 2155 | 216 | |
| 700C Tubular | 2130 | 213 | 700c | |
| 35-622 | 700x35C | 2168 | 217 | |
| 38-622 | 700x38C | 2180 | 218 | |
| 40-622 | 700x40C | 2200 | 220 | |
| 42-622 | 700x42C | 2224 | 222 | |
| 44-622 | 700x44C | 2235 | 224 | |
| 45-622 | 700x45C | 2242 | 224 | |
| 47-622 | 700x47C | 2268 | 227 | |
| 54-622 | 29x2.1 | 2288 | 229 | |
| 60-622 | 29x2.3 | 2326 | 233 |
Tire circumference may change depending not only on tire size, but also on tire type, air pressure, the weight of the rider, and other factors.
To facilitate initial setup, the above "Tire circumference reference table" is contained in the instruction manual. However, if you would like more accurate measurement or if your tire size is not listed in the "Tire circumference reference table", you will need to measure the tire circumference (i.e. ground contact surface) as shown in the illustration below and enter the measured value.
Measure the tire circumference of your bicycle. Make a mark to use as a reference point on the surface of the tire that contacts the ground, then roll the tire and determine the tire circumference.
