European Tyre and Rim Technical Organisation

The European Tyre and Rim Technical Organisation (ETRTO) exists to specify and harmonise sizes of rims and their associated pneumatic tyres across the European Union. ETRTO sizes apply to rims and tyres for vehicles of all types. It is probably most well-known for size standardisation of bicycle tires designations in millimeters, which replaces many older national methods for referring to tire sizes that are incompatible. The great advantage of ETRTO sizing is that it is unambiguous; previously, nominal dimensions were used which were interpreted in different ways by different countries and manufacturers - a problem for the end user.

ETRTO works in liaison with the International Organization for Standardization to develop relevant standards.

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