What do the numbers in tire sizes mean

31x1050R15 C 109R Euro-Metric tire sizes ending with a C are commercial tires for use on delivery trucks and vans capable of carrying heavy loads. The aspect ratio sometimes called the tires profile.

An example of tractor tire sizes expressed in the standard format would be 149-42.

What do the numbers in tire sizes mean. C Commercial Example. 31x1050R15 C 109R Euro-Metric tire sizes ending with a C are commercial tires for use on delivery trucks and vans capable of carrying heavy loads. 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. Tire size specifications are outlined by the numbers and letters found on the sidewall of tires. It is important that we understand tire geometry and be informed of the parameters that govern their performance.

Tire sizes are defined by specifications such as the type width aspect ratio speed rating tire construction type and service description. 245 Section WidthTread mm The section width is the width of the tire from one sidewall to the other measured in millimeters. If theres no letter before the first number you have a metric tire most commonly referred to as European size.

Its also measured in millimeters but may have different load capacity than a P or LT tire. 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. Understanding Three Numbers in Tire Sizes.

The first number in a tires size say 225. As an example if a tire size has two sets of numbers 6-12 500-15 112-24 then the first number 500 -15 is the approximate width in inches and the second number 500- 15 is the rim diameter in inches. You may see tires without these tire numbers meaning the tires profile is standard 82.

In most cases with inch measurement tires the width will have a50 decimal after the initial number. In example A this reads 1250 meaning the tire width is 12 and 12 inches. In the size 25800-12 the meaning of the numbers is as follows.

25 - The overall height of the tire when mounted and inflated. 800 - The overall width of the tire. The final number group the 18 is the size of wheel the tire fits.

In our example size the tire will fit a 18-inch wheel. 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. Next you will find a slash and then another set of numbers.

The aspect ratio sometimes called the tires profile. This number is a percentage that indicates the tires height vs. In the example above the aspect ratio of our tire is 65 meaning that this tires height is 65 of its width.

After the forward slash the next number on our example tire is 65. This is the tires aspect ratio or its percentage of width to sidewall height. In this case 65 means that the tires height is.

1 These are some of the most important numbers on any tire as they tell you how big your tires are. In this case the tire is 245 millimeters at its widest point when its mounted on a wheel of. The next two numbers after the width of the tire show the sidewall height in the percentage of the tires width.

So if the tire markings indicate P22545R17 91V it means that the height of the sidewall is 225 multiplied by 055 or 10125 millimeters. The number 45 means that the height is equal to 45 percent of the width. 28 x 140 states the approximate outer diameter 28 inches and the tire width 140 inches.

Inch marking such as 28 x 1 58 x 1 38 approximate outer diameter x tire height x tire width is also common. Inch sizes are not precise and lack accuracy. This is the width of the tire across in inches second number 10.

This is the wheel size the tire should be mounted on last number As you can see above golf cart tires are typically classified with METRIC measurements most low profile street tires or STANDARD measurements most All Terrain Turf Lifted tires. The table at the. An example of tractor tire sizes expressed in the standard format would be 149-42.

The 149 means the tire is 149 inches wide and the 42 tells us that this tire fits a 42-inch diameter wheel. The dash - indicates the tire construction is bias-ply but this could be an R if the tire is radial.