[ISO METRIC Sizing system]

The International Standards Organization (ISO) Metric system combines the Metric system with a service description. The service description designates the load index along with the speed rating symbol.

< P-Metric Sizing System >

To accommodate the smaller tires used on compact cars, the P-Metric (Passenger Metric) system was created in 1976. The maximum inflation pressures of P-Metric tires were raised for lower rolling resistance.

< TBR TIRE Sizing system >