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TIRE TECH: NORTH AMERICAN LOAD & PRESSURE MARKINGS


The maximum load and maximum inflation pressure are required to be branded on the sidewall of tires sold in North America.

Tire pressures are normally measured in "pounds per square inch" (psi), Kilopascals (kPa), or bars of pressure (bars). At sea level, Earth's atmosphere is pressing against the surface with a force of 1 kilogram per square centimeter. This pressure is identified as one "bar," and is equal to 100 Kilopascals or 14.7 pounds per square inch of pressure.

TIRE TECH: CALCULATING APPROXIMATE TIRE DIMENSIONS


Most modern passenger car and light truck tires feature size designations that indicate the tire's dimensions in a combination of metric, mathematical and English systems. While this unusual combination of millimeters, percentages and inches is a byproduct of the evolution of global tire specifications, it also provides the ability to calculate/estimate basic tire dimensions.

TIRE TECH: ALIGNMENT


While it's often referred to simply as an "alignment" or "wheel alignment," it's really complex suspension angles that are being measured and a variety of suspension components that are being adjusted. This makes an alignment an important suspension-tuning tool that greatly influences the operation of the vehicle's tires.