Euro-Metric vs. P-Metric

Euro tire and a p metric tire side by side

Load carrying capacity is one of the most important factors to consider when choosing a tire and these are designated according to Euro-metric, P-metric or LT-metric tire sizing systems. You can read these metrics by reading your tire's sidewall.

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Most tires are made using one of three primary sizing systems:

EURO-METRIC TIRES

If there is no letter designation before the tire size then the tire was constructed according to European standards set in place by the European Tyre and Rim Technical Organization (ETRTO).

P-METRIC TIRES

A “P” before the tire size indicates it is a P-metric tire. P-metric tires are constructed according to American standards set by the Tire and Rim Association (TRA).

LT-METRIC TIRES

LT-metric (or light truck) tires are used primarily on ¾ to one-ton vehicles. Considering the difference in load-carrying capacities, LT-metric tires cannot be replaced by Euro-metric or P-metric tires, which are intended for passenger vehicles and not suited for light trucks. There are several differences between passenger and light truck tires.

Both the TRA and the ETRTO use different calculations to determine a tire’s maximum load-carrying capacity, indicated by a two or three-digit code called a load index and found after the size description.

Though two tires may bear the same load index, P-metric and Euro-metric will be different in actual load-carrying capacity. Euro-metric tires typically have a higher load-carrying capacity than P-metric tires of the same size.

Avoiding overloading and underinflation helps provide the desired handling, braking and cornering performance intended by the vehicle manufacturer.

When replacing tires, be sure to install tires that meet or exceed the vehicle’s load capacity. For this reason, it is very easy to replace P-metric tires with Euro-metric options. Care must be taken when replacing Euro-metric tires with P-metric models. In certain situations, you can increase the air pressure in a P-metric tire to enable it to carry the same load as a Euro-metric one. Regardless it is important to always ensure your tires are at the correct air pressure to avoid flats, blowouts, uneven tread wear or unsafe driving conditions.

If you’re unsure what type of tire you have or what type of tire you need, turn to us at America's Tire. We’re your tire and wheel experts; we’ll get you taken care of.

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