![]() ![]() Most tire shops will have a maximum wheel and tire size listed for your vehicle that will still fit without rubbing, but it's always best to check multiple sources and take advantage of online forums for advice.Ĭheck out our guide for upgrading wheels and tires because bigger isn't always better. It will also change your speedometer reading. Luckily, your tire size is easy to figure out. However, measuring the tire size manually with a tape measure will not give you accurate results. ![]() Going beyond that size will throw off your gearing and result in slower acceleration. You may need to know the size of your tires for various reasons, such as for a spare tire or when purchasing wheels, rims, or snow tires. The door jam of your vehicle will also indicate what size tires the manufacturer recommends. A tire that reads 33 x 12.5 R15, is 33-inches in diameter (or tall), 12.5-inches wide, and will fit a 15-inch wheel. A few special-purpose tires, like PAX system tires, use a metric designation for rim diameter.Ī standard sized tire will be displayed in inches. If it seems odd to you to spec tire width in millimeters and diameter in inches, it does to me, too. On all other tires, it's found elsewhere on the sidewall.ĭ = Refers to diagonal, or old-fashioned bias-ply tire, now used only on trucks and trailers. Only the highest-rated tires, the Z-rated models, still label the speed rating inside the tire-size designation. A 50-series tire is half as tall as wide, while a 70-series is 70 percent as tall as its width. Tire width is usually the first thing to help you determine the tire’s size. This is the three-digit number that comes after the initial letter on the TIN and is measured in millimeters. Aspect ratio is expressed as a proportion of the width instead of as an absolute number, so it's easier to compare the profiles of different-size tires. After determining the tire type, you should look at the tire width. This indicates the distance from the wheel-rim mounting surface to the outside of the tread. That`s the overall width of the tire in millimeters when mounted on the correct width rim. ![]()
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