How to read tire measurements

Is the ratio of the height of the tires cross-section to its width. A tire that reads 33 x 125 R15 is 33-inches in diameter or tall 125-inches wide and will fit a 15-inch wheel.

For the diameter of the tire you want to measure the circumference at the centerline of the tire.

How to read tire measurements. Is the ratio of the height of the tires cross-section to its width. The two-digit number after the slash mark in a tire size is the aspect ratio. For example in a size P21565 R15 tire the 65 means that the height is equal to 65 of the tires width.

The bigger the aspect ratio the bigger the tires sidewall will be. P Passenger Car Tire. The first letter on a tire indicates the tires class.

P designates this tire as a passenger car tire an LT before the tire. 245 Section WidthTread mm 45 Aspect Ratio. Ratio of Sidewall height to width Z Speed Rating S 112mphT 118mph.

There are two ways that tire manufacturers display tire size inches and metric. How to read tire size in inches is very straight forward. 33X1250R15 The first number is your overall diameter of the tire.

In this example the tire diameter or height is 33 inches tall. The second number represents the width of the tire. How to Read Tire Size The Letters P and LT.

For most vehicles youll see the letter P before the number sequence begins. The first number to appear in your tire size information is the width in millimeters of the correct tires for. After the slash mark.

Euro-Metric tires do also have different load capacities. The first three digits on our tires are reading 225. This means that the tire width of our tire from sidewall to sidewall is 225 millimeters wide.

For example a 19555R15 tire is 195mm wide from sidewall to sidewall. The first number in this series refers to the tires section width or the distance from sidewall edge to sidewall edge measured in millimeters up and over the tires tread. The first set of numbers in the numerical sequence indicates the width of your tire as measured in millimeters from sidewall to sidewall.

Read the manufacturer and the tire name. These are printed in large letters toward the outside of the tire. Look at the service description.

The service description although it doesnt appear on every tire is usually right. Find the width and aspect ratio. This is a series of.

To get the sidewall height take the tire width of 215 mm and convert it to inches 846. Then multiply this by65 and you get 55 inches the sidewall height in inches. CONSTRUCTION TYPE This single letter tells you about the internal construction of the tire.

R is for radial tires the industry standard for most tires today. In the example above the tires width measured from the widest point of the inner sidewall to the widest point of the outer sidewall when properly mounted is 225 millimeters. The section width can be converted to inches by dividing the width in millimeters by 254 like so.

225 millimeters 254 mmin 886 inches. A standard sized tire will be displayed in inches. A tire that reads 33 x 125 R15 is 33-inches in diameter or tall 125-inches wide and will fit a 15-inch wheel.

The door jam of your vehicle. The 225 represents the approximate section width or width of the tire from sidewall to sidewall. The larger the number the wider the tire.

60 Aspect Ratio The 60 refers to the aspect ratio which is the nominal sidewall height reflected as a percentage of section width. To do this properly youll need to multiply the tires aspect ratio by two which will give you the overall width that the tire adds to the wheel. Convert to inches and add this number to the.

Understanding Metric Tire Measurements Metric to Imperial tire conversion chart Metric Imperial Metric Imperial Metric Imperial 2157515 277x 85 2457516 305x 96 3157017 349x 129 2257015 274x 89 2557016 300x 100 2756518 321x 110 2257515 283x 89 2657016 3. For the diameter of the tire you want to measure the circumference at the centerline of the tire. The easiest way to measure this distance is using a string.

Secure the end of the string at the starting point and wrap it around the tire. Mark the string where it intersects the starting point. This percentage compares the tires section height with the tires section width.

For example this aspect ratio of 50 means that the tires section height is 50 of the tires section width. R indicates the construction used within the tires casing. R stands for radial construction.

Frequently Asked Questions About Changing Wheel Size need to know your vehicle to ensure a proper fit. Experience has taught us that searching by wheel size offset andor bolt pattern alone arent specific enough criteria to ensure an exact fitment. Attention to detail prevents vibration wheel and tire interference and unbalanced handlingRead.