Eurometric dating

P-metric sizes were introduced in the United States in the late 70s and are installed on vehicles primarily used to carry passengers, including cars, estate cars, sport utility vehicles and even light-duty pick-up vans.Their load capacity is based on an engineering formula which takes into account their physical size (the volume of space for air inside the tyre) and the amount of air pressure (how tightly the air molecules are compressed).(R) Internal Construction The "R" refers to radial construction, which has been the industry standard in passenger-car tires for more than 25 years.Prior to radial tires, most cars came with bias-ply tires, which had a crude construction that made for poor handling.

Generally speaking, the larger this number is, the wider the tire will be.

A letter from A to Z symbolizes a tyre's certified speed rating, ranging from 5km/h (3 mph) to above 300 km/h (186 mph).

P-metric sized tyres are those with the "P" at the beginning of the tyre size (such as P215/65R16).

Their load capacity is based on an engineering formula which takes into account their physical size (the volume of space for air inside the tire) and the amount of air pressure (how tightly the air molecules are compressed).

Since all P-metric sizes are all based on the formula for load, vehicle manufacturers can design their new vehicles (weights and wheelwell dimensions) around either existing or new tire sizes.

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