How to Read Your Tire's Size Code - Tech Tire Repair Solutions (2024)

FAQs

How to Read Your Tire's Size Code - Tech Tire Repair Solutions? ›

After tire width, you'll find a slash and a two digit number. This indicates the aspect ratio, which gives the tire height. Aspect ratio specifically is the tire sidewall height as a percentage of the width. A high aspect ratio means that a tire has a larger sidewall while a lower one means a lower sidewall.

After tire width, you'll find a slash and a two digit number. This indicates the aspect ratio, which gives the tire height. Aspect ratio specifically is the tire sidewall height as a percentage of the width. A high aspect ratio means that a tire has a larger sidewall while a lower one means a lower sidewall.

Example tire number: P215/65R15 95H

The number 215 indicates the tire width in millimeters from sidewall to sidewall, so 215 millimeters in this case. 65 is the aspect ratio code, which means the ratio of its height to width. This tire has a height equal to 65% of its width. R indicates radial construction.

Look at the sidewall of your tire – there will be a code following the letters “DOT” – for Department of Transportation. There will be up to 13 characters that give you the information you need to identify your tire and also identify the date of manufacture of your tires.

The bigger number (on the left) is the Section Width. The number to the right of the slash ("/") is the Aspect Ratio (percent of width). The "R" means Radial tire and the last number, far right, is the rim diameter (in inches!).

As a general rule, you want replacement tires that are within 3 percent of the diameter (height) measurement of your existing tires' diameter — assuming your current tires are what your owner's manual recommends.

You can find that on the sidewall of the tires on your original wheels or the inside frame of the driver's door. Check out Tire Size Explained (Reading the Sidewall) for more. The wheel diameter (in inches or millimeters) is the fifth set of numbers and letters.

The forward slash separates the tire width number from the two-digit aspect ratio. The bigger the aspect ratio, the higher/taller the tire's sidewall, or “profile” as it's sometimes called. The aspect ratio is indicated on the tire sidewall as a percentage.

How to read tire marking code? ›

The tire date code appears in the DOT (Department Of Transportation) field, where other tire markings are present. The first codes are for the US market requirements. The date code appears at the end, with four numbers. The first two numbers designate the week and the last two numbers, the year of production.

Where can I find my tire size? The tire size for your vehicle and wheels can be found in two places: Sidewall of your tire. Inside frame of the driver side door.

B: TIRE WIDTH

The three-digit number following the letter is the tire's width (from side to side, looking at the tire head-on) in millimeters. This may also be referred to as the section width.

Yes it will. However as your sidewall profile is lower (60% of tread width as compared to 65% of tread width) you'll be using a smaller diameter overall tire, resulting in a slower actual speed being travelled than what your speedometer is showing.

Yes, these tires should fit just fine. The only difference is that the 265 series tires will be about 10mm shorter in width across the tread in comparison to the 275 series tires. The side wall will also be marginally taller on the 265 series tires.

The first number in the tire size, 275, represents the width of the tire in millimeters. To convert this to inches, we divide 275 by 25.4 (since there are 25.4 millimeters in an inch). This gives us approximately 10.8 inches.