Some automobile makers recommend replacing tires at six years, but if there is no recommendation, we recommend replacement at 10 years, as some tire makers suggest. Don’t buy tires more than a couple of years old. ![]() The last four digits determine the week and year the tire was made for example, the digits 2321 would signify that the tire was made during the 23rd week of 2021. When the tire was made: Every tire has a Department of Transportation (DOT) number after the letters on the sidewall. Recognize that the first letter denotes the service type. 1 2 For instance, the series may look like this: P 225 / 50 R 17 98 H. Follow the advice on the vehicle’s placard. The size should be printed underneath the tire manufacturer name, just above the rim of the tire. But that doesn’t mean you should inflate your tires to that pressure, because automakers typically recommend an inflation pressure well below the tire’s maximum air pressure. Maximum pressure: This is a tire’s maximum safe air pressure, given in pounds per square inch. For temperature resistance, scores range from A (best) to C. Traction and temperature scores: These scores denote a tire’s wet-stopping ability and temperature resistance. The better gauge is to refer to our tread life predictions on the tire model pages, based on our extensive testing. But the tire makers certify that the tires meet the wear ratings. In theory, a tire graded 400 should last twice as long as one graded 200. Treadwear rating: Grades for our light-truck tires ranged from 500 to over 800. Choose tires that have a speed rating at least as high as the one specified on your vehicle’s placard. While such speeds may seem wildly impractical, tires with higher speed ratings tend to provide better handling at legal speed limits. Speed ratings for other tires include Q, 99 mph H, 130 mph V, 149 mph W, 168 mph Y, 186 mph and ZR, more than 149 mph. For S-speed-rated tires, it’s 112 mph for T, 118 mph. Speed rating: This letter denotes the maximum sustainable speed and is found directly after the load index. Choose tires with a load index at least as high as the one that’s listed on your vehicle’s placard or owner’s manual. You’ll find it after the tire size the 103 load index for most of the tires we’ve recently tested correlates to 1,929 pounds. Load index: This number is based on the weight the tire can safely carry. R means radial-ply construction, and 17 is the wheel diameter, in inches. The number 235 is the cross-section width in millimeters, and 65 is the ratio of sidewall height to cross-section width (65 percent). Some may start with an LT prefix, used on heavy-duty trucks. Finally, like the first set of numbers, that R15 means it is a radial tire and has a 15" diameter.įor those who have the metric reading on their tires, you can simply plug that into the conversion calculator to determine the tire size, or find that corresponding reading on one of the below conversion charts.Size: P235/65R17 is a common one. That 75 is the tire's aspect ratio and simply means the tire's height is equal to 75 percent of its width. From left to right, the P indicates a passenger tire while 265 indicates the tires width in millimeters. The second listing is a metric set up, and is what is more common on factory-type sized tires. ![]() That third reading is the tire type as radial and diameter as 17". That first number is your tire size at 35", and then the second number tells you the tire width at 12.5". If it is the first listing, then here is the breakdown. Such standards should enable the consumer to compare these basic features. For example, it could simply say 35x12.5 R17, or it may show as P265 75 R15. Although tire manufacturers have size standards, these standards allow so. ![]() Now, this information could read in a few different ways. All tires are required to have this information, regardless of the manufacturer brand name. So here is some helpful information to assist you in determining what you currently have on the vehicle.įirst, the sidewall of your tire contains all the information needed to understand everything about that specific tire. And while a stock tire size is imprinted right inside the driver side B pillar, you may not know what if have if you are not the original owner. Knowing your Jeep's tire size can be essential information when it comes time to replace that rubber, or even if you ever decide to change wheels.
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