Sheldon Brown's

Cyclecomputer Calibration Chart

Tire Size Group A Group B Group C Group D Group E Group F
700 X 56 91.53 249 232 370 1444 2325
700 X 50 90.29 246 229 365 1424 2293
700 X 44 87.55 236 222 354 1382 2224
700 X 38 85.82 231 218 347 1355 2180
700 X 35 84.21 230 217 345 1347 2168
700 X 32 83.22 227 216 342 1339 2155
700 X 28 82.55 225 214 336 1327 2136
700 X 25 82.12 223 211 335 1308 2105
700 X 23 81.56 222 210 333 1302 2097
700 X 20 81.02 221 209 332 1296 2086
27 X 1 3/8 85.08 232 217 345 1349 2169
27 X 1 1/4 84.33 230 216 343 1343 2161
27 X 1 1/8 83.58 228 216 342 1339 2155
27 X 1 82.91 226 215 340 1333 2145
26 X 2.125 82.12 225 207 330 1286 2070
26 X 1.9 80.63 220 206 324 1276 2055
26 X 1.5 77.71 212 199 312 1234 1985
26 X 1.25 77.44 206 195 311 1213 1953
26 X 1.0 (559 mm) 75.31 205 191 305 1189 1913
26 x 1 (650C) 76.85 206 195 311 1213 1952
Wide Tubular 83.34 224 212 338 1316 2117
Narrow Tubular 82.12 223 210 335 1308 2105
26 X 1 3/8 81.41 222 207 330 1288 2068
24 75.43 205 192 305 1191 1916
24 x 1 69.01 188 175 279 1089 1753
20 X 1.75 (406) 60.15 158 150 254 927 1491
20 X 1 1/4 (451) 63.70 173 162 257 1005 1618
17 x 1 1/4 52.17 142 133 211 838 1325
16 x 1 3/8 50.47 137 128 204 797 1282

Copyright © 1996 Sheldon Brown

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Last Updated: by Harriet Fell