P-Metric tyres are the most common type of tyre. The P stands for passenger vehicle, meaning that these tyres are designed for use on passenger vehicles like cars, minivans, light-duty pickup trucks (¼ ton or ½ ton capacity), and SUVs.

Metric tyres, also known as Euro-Metric tyres because the sizing originated in Europe, don’t have a letter designation. Euro-Metric sizes are equivalent to P-Metric sizes in dimensions, but Euro-Metric sizes have subtle differences in their load-carrying ratings and capabilities. Euro-Metric tyres are usually found on European cars, but they’re also used frequently used on SUVs and vans.

Light Truck Metric tyres sizes begin with the letters LT. These tyres are designed for use on vehicles used to tow trailers or carry heavy loads. This includes SUVs, full-size vans, and medium-duty and heavy-duty pickup trucks with ¾ ton to 1-ton capacity.

These tyres are made for light-duty, medium-duty, and heavy-duty pickup trucks (typically ½ ton, ¾ ton or 1-ton load capacity), sport utility vehicles, and vans.
When a tyre’s descriptor ends in LT, it falls into one of three light truck categories:
Numeric:
Earlier numeric sizes are designed to carry heavy cargo loads and/or tow trailers.
Wide base:
Wide base tyres are also designed to carry heavy cargo loads and/or tow trailers on a wheel rim with a diameter of 16.5 inches.
Flotation:
Flotation tyres are wider, oversized tyres designed to carry heavy cargo loads and/or tow trailers on loose surfaces such as sand, gravel, or dirt.