![]() ![]() ![]() Because tires are global products, their maximum load capacity is branded on the tire in kilograms (kg) and pounds (lb.). The tire's maximum load is indicated in relatively small sized print branded near the tire's bead (adjacent to the wheel) indicating the appropriate value. Tires with equivalent physical dimensions typically carry equivalent loads (until they reach their maximum load pressure). This is because a tire's load capacity is a function of its size (which determines the size of the 'air chamber'), its construction (which determines how much pressure can be held) and the actual air pressure used (which determines how many air molecules are forced inside the chamber). The above chart correctly shows that an extra load tire is not rated to carry any more load than a standard load tire when both are inflated to the same pressure (up to the standard load tire's 'maximum load' pressure of 35 psi). Note: 35 psi is the assigned 'maximum load' pressure for standard load tires and 41 psi is the assigned 'maximum load' pressure for extra load tires. For example, P235/75R15 P-metric sized, standard load (SL) and extra load (XL) tires used on cars would be rated to carry the following loads at the inflation pressures indicated: Air Pressure (psi) This reduction in load results in causing light truck vehicle manufacturers to select proportionately larger P-metric sized tires for their vehicles to help offset the forces and loads resulting from a light truck's higher center of gravity and increased possibility of being occasionally 'overloaded.'įor example, P235/75R15 P-metric sized, standard load tires used on cars and light trucks would be rated to carry the following maximum loads at 35 psi: CarsĪdditionally, while a tire's maximum load is the most weight the tire is designed to carry, its load carrying capacity at lower inflation pressures is proportional to how much inflation pressure is used. However, if the same P-metric tires are used on light trucks, (pickup trucks and sport utility vehicles for example), their carrying capacity is reduced to 91% of the load indicated on the tire's sidewall. P-metric tires used on passenger cars and station wagons are rated to carry 100% of the load indicated on the tire's sidewall (or listed for the tire in industry load/inflation charts). Inflation Pressure Assigned For 'Maximum Load' Ratings Listed below are the air pressures at which maximum load is rated for popular P-metric and LT tires: Tire Load Ranges 'Higher' load ranges are used to identify tires that have a stronger internal construction, and therefore can hold more air pressure and carry more weight.Įach load range has an assigned air pressure identified in pounds per square inch (psi) at which the tire's maximum load is rated. Since a tire's load carrying capacity is related to the tire's size and how much inflation pressure is actually used, maximum loads are rated with the tire inflated to an industry assigned inflation pressure.Īdditionally, load ranges are used to separate tires that share the same physical size, but differ in strength due to their internal construction. The Tyre and Rim Association of AustraliaĪ tire's maximum load is the most weight the tire is designed to carry.The Japan Automobile Tire Manufacturers' Association (JATMA).Indian Tyre Technical Advisory Committee.European Tyre and Rim Technical Organization (ETRTO).Associacao Latino Americana De Pneus E Aros.The Tire and Rim Association in the United States has established a liaison with the following international tire and rim organizations: The purposes of the Tire and Rim Association, Inc., include the establishment of interchangeability standards for tires, rims and allied parts for the guidance of manufacturers of such products, designers and manufacturers of motor vehicles, aircraft and other wheeled vehicles and equipment, and governmental and other regulatory bodies. ![]()
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