To determine a passenger tire's load rating, check the tire’s sidewall, and find the load range code next to the tire size. The minimum range is 71, or a load rating of 761 pounds, whereas the maximum range is 110, or a load rating of 2,337 pounds.
A tire’s load rating refers to its load limit or the amount of weight it can safely carry while running on the road. The Department of Transportation and tire manufacturers choose appropriate load ratings through extensive testing. The numbers or letters printed on tires do not indicate actual load ranges; they are codes that correspond to specific load ranges. Several charts are available online to help look up the load ranges from these codes, such as the one found at TyreRack.com.
The load rating and tire size of a truck tire are usually indicated separately. Load ratings of truck tires consist of alpha characters rather than numbers, and they differ based on the tire size. For instance, a D load rating on a 7.50R16LT tire means that the tire can support up to 2,140 pounds, whereas it can support around 2,150 pounds on an LT225/75R16 tire. Again, tables of these ratings are available online, such as the one available within the Wikipedia tire code article.