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Jul
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. 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 final number group the 18 is the size of wheel the tire fits.
Tire size numbers what they mean. 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 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. 245 Section WidthTread mm The section width is the width of the tire from one sidewall to the other measured in millimeters.
What do the numbers on tires mean. Tire service type ratings. Most tire sizes begin with one or more letters – for example P or LT.
The letter tells us. P P-Metric Example. P-Metric tires are the most common type of tire.
The P stands for passenger. Metric Euro-Metric. 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. Explanation of tire codes 3-digit number.
The nominal section width of the tire in millimeters. The widest point from both outer edges side. Slash character for character separation.
2- or 3-digit number. The aspect ratio of the sidewall height as a percentage of the nominal section width. 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. Also called the section width this measurement is taken from outer sidewall to inner sidewall.
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.
Aspect ratiotire profileseries is the relation of the tires width and height in percent. So 55 profile is 55 of the width meaning the tires height is taking the width of 205 mm 11275 mm or 44. You may see tires without these tire numbers meaning the tires profile is standard 82.
Understanding Three Numbers in Tire Sizes The first number in a tires size say 225 is the width of the tire in millimeters. This is pretty straight forward except that in the days of buying tires sized by the inch remember 311050x15 the first number was the height rather than the width. Back then it was inches not millimeters.
Heres a common tire size. The first letter P means its a passenger car tire. Tires for a pickup or some sport-utility vehicles might start or end in LT meaning light truck.
In example A this reads 1250 meaning the tire width is 12 and 12 inches. The final number simply is the wheel size or diameterof the wheel that the tire will fit on. Finding the tire size meaning in metric measurements is a little more difficult and usually take a calculator to get exactly right.
A smaller number means a lower profile and the height-to-width ratio is shown as a percent. For example if the aspect ratio is 90 that means that your tires cross-sectional height is 90 of its width. If the tire has the metric alpha or low-profile inch numbering system the aspect ratio will appear immediately after the width.
P identifies your tire as a Passenger Tire. The P stands for PMetric. If your tire size starts with LT rather than a P than it identifies the tire as a Light Truck tire.
225 identifies the tire section width which is the measurement of the tire from sidewall to sidewall in millimeters. This number is the tires aspect ratio or its section height compared to its section width. In this example the section or sidewall height is 65 percent of the section width.
This number can be. After the tirewheel size there is often a gap followed by a set of numbers and letters. These denote the tires load index or how much weight the tire can carry.
The letters and numbers. The number following the construction code is the size of the wheel that the tire will fit in inches. The example tire would be designed to fit a 16-inch wheel.
Tire sizes on modern vehicles typically start at 13-inches and go up to 18-inches but aftermarket and special package wheels can be 22-inches or even larger. The next three-digit number tells you the tires size in millimetres. In the picture below the tire would be 215 mm wide measured from sidewall to sidewall.
As pictured above the numbers that indicate the size are found on the sidewall of the tire and although they might be confusing at first sight they are pretty straightforward. Generally the size is indicated by two numbers that correspond approximately to the outside or inside diameter and the width of the tire but not always in that order.