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ETRTO

The ETRTO (European Tyre and Rim Technical Organisation) table contains the standardized sizes for bicycle tyres and rims. It ensures that tyres and rims from different manufacturers are compatible.

In the overview table you can compare the common bicycle tire sizes in inches and the corresponding ETRTO values:

inch (in) ETRTO (mm)
12" 47-203, 62-203
14" 40-254, 44-254, 47-254
16" 32-305, 35-305, 47-305
18" 32-355, 37-355, 47-355
20" 28-406, 32-406, 40-406, 47-406, 50-406
24" 32-507, 40-507, 47-507, 50-507
26" 37-559, 44-559, 50-559, 57-559, 60-559
27.5" (650B) 50-584, 57-584, 60-584
28" 25-622, 28-622, 32-622, 37-622, 40-622, 47-622
29" 50-622, 55-622, 60-622

๐Ÿ’ก Note: Some sizes overlap, especially 28" and 29", as both have the same rim diameter (622 mm). The difference lies in the tire width and the intended use (road bike vs. MTB).

Gran Fondo

Published: March 26, 2025  |  Updated: March 26, 2025

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