ISO 5775 is an international standard for labeling the size of bicycle tires and rims. The system used was originally developed by the European Tyre and Rim Technical Organisation (ETRTO), and is now managed by the ISO. It is designed to make tire sizing consistent and clear, through replacing overlapping informal systems that ambiguously distinguished between sizes.
ISO 5775 is an international standard for labeling the size of bicycle tires and rims. The system used was originally developed by the European Tyre and Rim Technical Organisation (ETRTO), and is now managed by the ISO. It is designed to make tire sizing consistent and clear, through replacing overlapping informal systems that ambiguously distinguished between sizes.
Source: Wikipedia "ISO 5775" · CC BY-SA 4.0
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