Car Tire Number Meaning

Is the ratio of the height of the tires cross-section to its width. Winter tires may carry the letter R 106 mph or higher.

Tyre Designation Wheel Designation Design Tyre Knowledge Car Tyre Size Automobile Engineering Tire Specification

So if a tire has an aspect ratio of 45 that means the tires height is 45 of its.

. If there is no letter s than the tyre is engineered according to European Tyre and Rim Technical Organisation ETRTO standards. It is an optional letter or letters to indicate the intended vehicle for the tyre that the tyre is engineered according to Tyre and Rim Association TRA standards. The two-digit number after the slash mark in a tire size is the aspect ratio.

21565 R15 65 in the sequence is the aspect ratio of the tire. This number is the tires aspect ratio essentially the height of the tires profile outward from the rim represented as a percentage of the tires width. For a better understanding lets take the series P21565R15 95H as a reference.

21565 R15 215 in this sequence refers to the tires width in millimeters. The raised numbers of the DOT Code are placed together and often enclosed in a raised oval. That number can be found in your owners manual and on the.

It tells you who manufactured the tire where it was made and other tracking information. It is not the recommended tire pressure. Research and Shop at Tire Rack.

The aspect ratio is a percentage and it tells you the ratio of the tires height to its width. The letter is the speed rating or the maximum speed the tire is. We calculate this number by dividing the tires section height by the tires section width.

The sixth number in the code lists the tires load index. A P refers to a Passenger car tire. This number refers to the maximum amount of air you can put in a tire before you harm it.

The following tire numbers represent rimwheel diameter measured from one side to another. Tires with the lowest speed ratings are usually listed as A followed by a number for example A1 A2 A3 and so on. The next number such as 235mm is the width of your tire from side wall to side wall and determines the width of the rim your tires are mounted on.

A grade of 300 denotes a tire that will wear three. For a P18575 R17 82S tire the aspect ratio would be 75 meaning the sidewalls height is 75 of the tires width or about 55 inches. The higher the number the larger the sidewall.

Plus it indicates that the tire has passed the Department of Transportations testing and NHTSA manufacturer requirements. The first two letters or numbers after DOT refer to the manufacturing plant where the tire was produced and the last four numbers indicate the week and year the. What Do Tire Numbers Mean.

Like with the 9L symbol its intended for internal use between the manufacturer and distributor. Learn More at Tire Rack. Ad Understanding Tire Size.

You can see such tires on most passenger vehicles. For example in a size P21565 R15 tire the 65 means that the height is equal to 65 of the tires width. This is a measure engineers use to show the maximum amount of weight the tire can support when fully inflated.

The next number such as 40 or 65 refers to the height of the sidewall as a percentage of the width. The DOT stands for Department of Transportation and is followed by the tire identification number. Manufacturers may also insert Z into the size description in the tire code data between aspect ratio and diameter for these kinds of tires.

1016 this is the date of manufacture. The two-digit number that usually follows the tires section width tells us the aspect ratio or tire profile measurement. A government-required number that indicates a tires expected wear.

In this example the 45 indicates that the sidewall distance from the wheel rim to the outside of the tread is 45 of the section width. In most cases with inch measurement tires the width will have a 50 decimal after the initial number. The DOT number is used for safety standard certification and also in the event of a tire recall by the manufacturer.

In other words this tire is 215 millimeters wide from sidewall to sidewall. What do the numbers on this tire mean. The number is the load rating or the amount of weight that it can handle.

TIRE TYPE The first letter in the code tells you what class of tire it is. P stands for passenger vehicle tire. Get Started With Treadwell Today.

What the tire treadwear number means is how well the tire stood up in tests against a control set of tires after being driven 7200 miles on a government test track. The two-digit number is in inches and the most regular sizes are the following. Heres where the treadwear numbers meaning gets a little murky.

Find The Perfect Tires For Your Driving Needs. According to current regulations the DOT Tire Identification Number must begin with the letters DOT followed by a series of characters usually 10 11 or 12 numbers letters or symbols. Heres what those numbers and indicators on the sidewall indicate and how to understand them.

Ad 30 Shorter Average Wait Time When You Buy and Book Online. 8 10 12 13 14 15 17 18 19 20 22 23 24 26 28. Some tires carry W or Y speed ratings.

In example A this reads 1250 meaning the tire width is 12 and 12 inches. The letters and tire numbers printed on the tire represent model width aspect ratio construction wheel diameter load index and speed rating. The final number simply is the wheel size or diameterof the wheel that the tire will fit on.

P-class tires include cars SUVs crossovers minivans and smaller pickup trucks. Tires sold on passenger cars. The second number represents the width of the tire.

The bigger the aspect ratio the bigger the tires sidewall will be. Its a percentage that tells you the height of the sidewall compared to the tires width. CC A plant code that indicates the tire manufacturer and plant location 9L Manufacturer-specific code that expresses tire size XYZ This is a code for brand characteristics.

Type Letters that stand at the beginning of the series are to inform the tire type.

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