Tire Size
as stamped on the sidewall
Approximate Circumference
in Centimeters
Approximate Circumference
in Millimeters
Solar (mph)
700x38c 218 2180 1355
700x35c 217 2168 1347
700x32c 216 2155 1339
700x28c 214 2136 1327
700x25c 211 2105 1308
700x23c 210 2096 1301
700x20c 209 2086 1296
27x 1 3/8 217 2169 1349
27x 1 1/4 216 2161 1343
27x 1 1/8 216 2155 1339
27 x 1 215 2145 1333
26x 2.35 208 2083 1293
26x 2.125 207 2070 1286
26x 2.1 207 2068 1281
26x 2.0 206 2055 1280
26x 1.9 205 2050 1276
26 x 1.75 202 2023 1255
26 x 1.75 202 1985 1234
26 x 1.0 191 1913 1189
26x 1.0 (559 mm) 195 1952 1213
26x 1 3/8 (650 c) 207 2068 1288
24x 1 175 1753 1089
20x 1.75 150 1491 927
16x 1 3/8 128 1282 797