What Do Numbers In Tire Size Mean

1 These are some of the most important numbers on any tire as they tell you how big your tires are. Diameter in inches of the wheel that the tires are designed to fit.

How To Read Tire Size

A smaller number means a lower profile and the height-to-width ratio is shown as a percent.

What do numbers in tire size mean. After the forward slash the next number on our example tire is 65. The P stands for PMetric. Few tires are made to this size currently.

Its also measured in millimeters but may have different load capacity than a P or LT tire. 225 identifies the tire section width which is the measurement of the tire from sidewall to sidewall in millimeters. An example of tractor tire sizes expressed in the standard format would be.

245 Section WidthTread mm The section width is the width of the tire from one sidewall to the other measured in millimeters. 28 x 140 states the approximate outer diameter 28 inches and the tire width 140 inches. Is the ratio of the height of the tires cross-section to its width.

In this case 65 means that the tires height is. 25 - The overall height of the tire when mounted and inflated. In the example above the aspect ratio of our tire is 65 meaning that this tires height is 65 of its width.

The first number is your overall diameter of the tire. Inch marking such as 28 x 1 58 x 1 38 approximate outer diameter x tire height x tire width is also common. If your tire size starts with LT rather than a P then it identifies the tire as a Light Truck tire.

The standard method of size expression is relatively simple but not as descriptive as metric. This measurement varies depending on the rim to which it is fitted. TIRE WIDTH The three-digit number following the letter is the tires width from side to side looking at the tire head on in millimeters.

800 - The overall width of the tire when mounted and inflated. In this case the tire is 245 millimeters at its widest point when its mounted on a wheel of. Some manufacturers build off-road tires using inches instead of millimeters so you may see sizes like 3317 This simply means the total height of the tire is 33 inches and it fits a 17-inch wheel.

The two-digit number that usually follows the tires section width tells us the aspect ratio or tire profile measurement. Understanding Three Numbers in Tire Sizes The first number in a tires size say 225 is the width of the tire in millimeters. 1- or 2-digit number.

In the size 25800-12 the meaning of the numbers is as follows. In most cases with inch measurement tires the width will have a50 decimal after the initial number. If theres no letter before the first number you have a metric tire most commonly referred to as European size.

The two-digit number after the slash mark in a tire size is the aspect ratio. The aspect ratio sometimes called the tires profile. This number is a percentage that indicates the tires height vs.

In this example the tire diameter or height is 33 inches tall. You may see tires without these tire numbers meaning the tires profile is standard 82. If the tire has the metric alpha or low-profile inch numbering system the aspect ratio will appear immediately after the width.

Inch sizes are not precise and lack accuracy. There is the rare exception of metric-diameter tires such as the use of the 390 size which in this case would indicate a wheel of 390 mm in diameter. It is important that we understand tire geometry and be informed of the parameters that govern their performance.

For example if the aspect ratio is 90 that means that your tires cross-sectional height is 90 of its width. This is the tires aspect ratio or its percentage of width to sidewall height. The final number group the 18 is the size of wheel the tire fits.

12 - The diameter of the wheel this tire will mount to. The second number represents the width of the tire. Next you will find a slash and then another set of numbers.

In our example size the tire will fit a 18-inch wheel.

What Do The Numbers On My Tires Mean Virginia Tire Auto