![]() For example, a tire with an H-speed rating has a maximum speed capability of 130 mph or 210 km/h. Often speed ratings are matched to the top speed capability of the vehicle. Speed Rating tells you the maximum speed capability of a tire. You'll also find the maximum load on the tire sidewall, in both pounds and kilograms. Load Index indicates the maximum load that the tire can support when properly inflated. A size P215/65 R15 tire is made for a wheel with a 15" diameter. It tells us the size of the wheel that the tire is intended to fit. Wheel Diameter is the size of the wheel measured from one end to the other. ![]() The letter "R" in a tire size stands for Radial, which means the layers run radially across the tire. The bigger the aspect ratio, the bigger the tire's sidewall will be.Ĭonstruction. For example, in a size P215/65 R15 tire, the 65 means that the height is equal to 65% of the tire's width. The two-digit number after the slash mark in a tire size is the aspect ratio. For instance, in a size P215/65 R15 tire, the width is 215 millimeters.Īspect Ratio is the ratio of the height of the tire's cross-section to its width. The first three-digit number in the tire size refers to the tire width. Tire Width is the width of the tire measured in millimeters from sidewall to sidewall. These tires generally require higher inflation pressures than passenger tires.Ĭonsult your owner's manual or tire placard for the recommended tire size and inflation pressure for your vehicle. Vehicle manufacturers equip some light trucks with "LT" type tires. The letters "LT," either at the beginning or at the end of the tire size indicate the tire was designed for light trucks. P-Metric and Euro-Metric tires may have different load capacities. If a tire size has no letters at the beginning, this indicates a Euro metric tire. Tire Type The letter "P" at the beginning of the "Tire Size" tells us the tire is a P-Metric tire, referring to tires made to certain standards within the United States, intended for Passenger vehicles. The numbers are indicators of the size, type, and performance of the tire. With a little explanation it's easy to understand what all of the letters and numbers mean on your tire's sidewall. Check the sidewalls to make sure there are no gouges, cuts, bulges or other irregularities.NOTE: Air pressure in a tire goes up (in warm weather) or down (in cold weather) 1–2 pounds for every 10 degrees of temperature change.Visually inspect the tires to make sure there are no nails or other objects embedded that could poke a hole in the tire and cause an air leak.(NOTE: Some spare tires require higher inflation pressure.) ![]() Repeat with each tire, including the spare.Then recheck the pressure with your tire gauge. If you overfill the tire, release air by pushing on the metal stem in the center of the valve with a fingernail or the tip of a pen.Add air to achieve recommended air pressure.Firmly press a tire gauge onto the valve.Remove the cap from the valve on one tire.Never “bleed” or reduce air pressure when tires are hot.) It is normal for tires to heat up and the air pressure inside to go up as you drive. (NOTE: If you have to drive a distance to get air, check and record the tire pressure first and add the appropriate air pressure when you get to the pump. When you check the air pressure, make sure the tires are cool - meaning they are not hot from driving even a mile.The “right amount” of air for your tires is specified by the vehicle manufacturer and is shown on the vehicle door edge, door post, glove box door or fuel door. It’s important to have the proper air pressure in your tires, as underinflation can lead to tire failure. ![]()
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