ISOETRTO

ISOETRTO is a proposed international standard and regulatory framework intended to harmonize tire and rim designation, labeling, and performance data across automotive markets. It would be developed and maintained through a collaboration between the International Organization for Standardization (ISO) and the European Tyre and Rim Technical Organisation (ETRTO).

The concept arose from concerns that divergent regional practices complicate cross-border tire supply and undermine safety. A joint working group of manufacturers, regulators, and researchers began in the early 2020s, producing initial drafts and public reviews in 2023–2024.

The scope would cover passenger cars, light commercial vehicles, and trucks. It would prescribe a unified tire size designation (width, aspect ratio, construction, and rim diameter), standardized load and speed ratings, and consistent labeling information. It would also specify testing procedures and data formats to support interoperability with vehicle and inventory management systems.

Governance would be provided by an ISO-ETRTO Council, with technical committees responsible for different parts of the standard. The program envisions multiple parts, such as terminology (ISOETRTO 1), measurement methods (ISOETRTO 2), labeling and data formats (ISOETRTO 3), and testing protocols (ISOETRTO 4). Ratification would require approval by ISO member bodies and national standards organizations.

As of the present, ISOETRTO remains in development and its adoption is voluntary in many jurisdictions. Proponents argue it would simplify cross-border tire procurement, improve safety through standardized information, and streamline regulatory compliance for manufacturers and fleets.