Pickup trucks and SUVs are available in different load carrying capacities. Compact pickups often feature 1/4 ton (226 kg) capacity while full-size pickups feature 1/2 (453 kg), 3/4 (680 kg) and 1 ton (907 kg) capacities. Full size SUVs are often available in similar load capacities. It is easier to "overload" a pickup truck than a passenger car, so tires on pickups and SUVs are more likely to experience additional stress. experience additional stress.
Switching from P-Metric/Euro-Metric to LT-Metric/Flotation
Many pickups and SUVs (especially compact and ½ ton) will come with P-Metric or Euro-metric tires as original equipment. These tires are selected by the vehicle manufacturer to meet the load capacity of the vehicle and so an equivalent replacement tire of the same size, load capacity and speed rating is of course appropriate. However, in some cases it may be desirable to switch from a P-Metric or Euro-Metric to an LT-Metric or Flotation size tire. Some of the benefits to switching to an LT tire can include:
Notice that none of the benefits include increased load capacity. That is because no matter what tire you put on your truck, the vehicle itself has a load capacity that should not be exceeded.
There are some important points to consider before deciding to switch your pickup or SUV from P-Metric or Euro-Metric to an LT type tire (LT-Metric or Flotation).
To determine the proper inflation pressure of LT tires on your vehicle use the following procedure:
Replacing LT-Metric/Euro-Metric Commercial (C-Type)
If your truck or SUV is ¾ or 1 ton capacity then it likely came from the factory with LT type tires. OE LT tires should never be replaced with passenger type tires, they do not have enough load capacity and are not designed to have the same load handling characteristics that your vehicle was intended for.
Also of consideration, if your vehicle has dual rear wheels, LT-Metric or C-Type tires should not be replaced with Flotation tires even if they are of equivalent physical size. Flotation tires are not intended for dual application and do not have dual load index stamping.
Trucks and SUVs tend to have a higher center of gravity than passenger cars. Ground clearance is important for trucks being driven off-road, and the only way to add clearance under the axles is to install taller tires. Designing the truck around taller tires results in a tall vehicle package and a higher center of gravity (with more body roll and load transfer), making the tires work harder, especially under braking and cornering situations and can make the vehicle less stable.