![]() The reason this works is that the rear wheels don't have to turn like the front wheels do. You'll most often see this with muscle cars, such as the Mustang, Challenger, and Camaro. TSW explains that sometimes, it's acceptable to have differently sized tires and rims for the front and back wheels, which is called staggered tires.In our example, this number is 15, which means the tire fits a wheel with a 15-inch diameter. The last number is important, as it tells you what size wheel the tire fits. This means the layers of the tire run radially across it. The middle letter on the right side of the slash tells you about the tire's construction method and will most commonly be "R," or radial. In our P215/65R15 example, those numbers are 65, which means the tire's sidewall height is 65% as large as the tire's width. The first set of numbers represents the aspect ratio of the tire's height to its width. On the right side of the slash symbol, you'll find two numbers, a letter, and two more numbers. Using a P215/65R15-size tire as an example, we can tell that the tire is for a passenger vehicle and has a 215-millimeter width. Tires sizes with these letters are for trailer wheels only. They'll have higher psi recommendations to better take on trailers and heavy loads. Tire sizes that start with these letters are intended to be used for light trucks. The two types have different load capacities. ![]() When there is no letter, it means it's made to meet European standards. This letter also lets you know that the tire is made to meet standards in the United States. If you see a letter on the left side, it refers to the tire type. The bigger this number is, the more road the tire touches. The numbers represent how wide the tires are, in millimeters, from sidewall to sidewall. On the left side of the slash symbol, you'll find three numbers and sometimes letters. These labels can be confusing if you're not sure how to read them, but once you learn the language of tires, they become more clear. When you look for new tires, you'll come across size names such as 235/75R15 or P215/65R15. The average driver may not know exactly what they are looking for when they shop for new tires, but as long as you keep a few fundamental rules in mind, replacing tires and rims is easy. When you replace your tires, try to stick with the same brand and size, as mixing and matching leaves your vehicle with different tire threads, which can cause spinouts and control loss. This setup means your tires have shorter sidewalls, which means stiffer sidewalls, and a higher chance for blowouts should you hit a pothole. However, if you match larger-diameter wheel sizes to lower-profile tire sizes, your speedometer and odometer shouldn't see any changes. Changing to larger tires with an improper sidewall height can cause damage to your vehicle's suspension system, wheels, and the tires themselves, and can run the risk of incorrect speedometer readings. This applies to switching to both smaller and larger tires. The reason for this is that a differently sized tire can confuse your speedometer and even cause damage to your vehicle's anti-lock braking systems and stability system calibrations. Once you choose a tire size for your vehicle, you'll want to stick with that size when you buy replacements. If you opt for larger wheels when you purchase your vehicle, you may not see this rise in price at first, but when you have to replace the larger wheels and tires, you will have a higher cost of replacement than someone driving a vehicle with smaller wheels. Try to find the best balance between size and your budget. However, bigger tires also mean bigger price tags, according to Consumer Reports. Overall, bigger tires and wheels are better for increasing your vehicle's traction. That being said, a vehicle with bigger rims will often be able to fit larger tires than other vehicles. For instance, your vehicle has a set size of rims, but you can buy different sizes of tires to fit those rims, as long as the middle of the tires is the correct size. ![]() Wheels and tires are not interchangeable words. So, does tire size really matter? The short answer is: Yes. According to iSee Cars, this increase in contact with the pavement gives your vehicle more to hold onto, increasing its handling and ability to maneuver. As a tire's width increases, it covers more surface area on the road. Simply put, the larger your tire, the more of a grip your vehicle has on the road. Using improper tires can be costly and sometimes even dangerous. But, wheel size - and the size of tires you put on them - matter. Many drivers give little thought to the sizes of their wheels and tires except for cosmetic purposes.
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