How To Read Tire Numbers

The number 60 indicates the tires aspect ratio. Check the first two digits to know the week.

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Thus a tire with the measurement P225 is for a passenger vehicle and has a nominal width of 225 millimeters.

How to read tire numbers. The ISO Metric tire code consists of a string of letters and numbers as follows. The two-digit number that usually follows the tires section width tells us the aspect ratio or tire profile measurement. Yy is aspect ratio sidewall height to tread width.

So a tire stamped 2910 was manufactured in the 29th week of 2010. Tak from Toyo Tires gives us some. For example a 19555R15 tire is 195mm wide from sidewall to sidewall.

If you come across a three-digit number you have a tire that was manufactured before 2000. The second number represents the width of the tire. P designates this tire as a passenger car tire an LT before the tire size would mean the tire is a light truck tire and a European metric tire would have no letter before the tire size.

If a tire size has no letters at the beginning this indicates a Euro metric tire. The aspect radio tells us which is the ratio of the tires width to its height. 1 These are some of the most important numbers on any tire as they tell you how big your tires are.

To determine the tires age look at the last four numbers of the code. The first number in this series refers to the tires section width or distance from sidewall edge to sidewall edge in millimeters when measured up and over the tires tread. Prior to year 2000 three numbers are used for the date of manufacture first two numbers identify the week and the last number identifies the year of manufacture.

245 Section WidthTread mm. This means that the tire width of our tire from sidewall to sidewall is 225 millimeters wide. In our example 09 13 stands for the week and year the tire was made.

Width in millimeters The first of the tire size numbers gives you the width of the tire from sidewall to sidewall in millimeters. Zz is wheel diameter inches. Note xxx is tread width in mm.

Tires Manufactured Before 2000 You need to check the last three digits of the DOT code. P-Metric and Euro-Metric tires may have different load capacities. In this case the tire was made in the 9th week of 2013.

33X1250R15 The first number is your overall diameter of the tire. The first three digits on our tires are reading 225. The next two numbers we find on our tire tells us the Aspect Ratio.

In this case the tire is 245 millimeters at its widest point when its mounted on a wheel of. Tire width always refers to the measurement from one sidewall to another. The first number to appear in your tire size information is the width in millimeters of the correct tires for your vehicle.

In this example the tire diameter or height is 33 inches tall. If the number begins with a P the tire is called P-Metric and is built in the US. The letter P at the beginning of the Tire Size tells us the tire is a P-Metric tire referring to tires made to certain standards within the United States intended for Passenger vehicles.

Tire Section Width The tire numbers in the above example tell us that the tire is 185 millimeters wide. There are two ways that tire manufacturers display tire size inches and metric. The final four numbers in the TIN represent date of manufacturer.

To identify tires manufactured in the 90s a decade symbol a triangle on its side is located at the end of the DOT serial number. For instance when the last three digits read 022 you should understand that the tire was manufactured in the 2nd week of that year. The first two numbers reflect the week and the last two indicate the year.

P 225 70R16 91S. Knowing the age of your tires will help you decide when to replace your tires and keep your driving safe and smooth. If not the tire is a European metric tire.

Tire diameter inches xxxyy1270zz where tire size is commonly written PxxxyyRzz on the sidewall. A DOT tire code of 127 indicates the tire was made on the 12th week of the seventh year of the decade. The first letter on a tire indicates the tires class.

The last number 14 indicates wheel diameter. How to read tire size in inches is very straight forward. To read a tire look for the width and aspect ratio which is a series of numbers and letters that looks something like 22550R17 The first 3 numbers are the width of your tire tread and the second 2 numbers are the thread-width percentage.

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.

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