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Feb
The 149 means the tire is 149 inches wide and the 42 tells us that this tire fits a 42-inch diameter wheel. Diameter in inches of the wheel that the tires are designed to fit.
The final number group the 18 is the size of wheel the tire fits.
What does tire size numbers 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.
LT or Light Truck are tires for towing trailers or have a 34 to 1 ton load capacity. A tire labeled T or Temporary Spare is meant to be used in the event of a flat tire. Tires labeled ST or Special Trailer are meant for trailers.
Including but not limited to boat trailers utility trailers and 5th wheels. Tires usually come in the following widths in inches. 8 10 12 13 14 15 17 18 19 20 22 23 24 26 and 28.
Tires in these sizes are typically found on most passenger cars light-duty light trucks SUVs minivans and vans. Tires with a rim diameter measured in inches are called inch rim sizes. R indicates that the tire is a Radial tire and D designates that it is a Diagonal also known as Bias ply tire and B means it is a Belted-Bias ply tire.
Today tires featuring Radial construction are by far the most common type. 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. 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.
1- or 2-digit number. Diameter in inches of the wheel that the tires are designed to fit. 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.
Few tires are made to this size currently. 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. Inch size is the most widely used measurement in ATV tires. 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 when mounted and inflated. 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. To simplify everythingA the best sizing to use is the ETRTO number as it is a universal standard and is based off the technical measurement of the tires.
Nowadays bicycle tire sizes are all marked according to ETRTO E uropean T ire and R im T echnical O rganization or ISO European standardHowever older English and French tire size dimensions are still used as well. 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. 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. In most cases with inch measurement tires the width will have a50 decimal after the initial number. 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. 410 refers to the width of the tire measured in inches 350 refers to the distance from the outside edge of the tire to the outside edge of the rim in inches 4 refers to the diameter of the rim in inches It should be noted that tire sizes in the industry are not exact.
60 is the two-figure aspect ratio. This percentage compares the tires section height with the tires section width. For example this aspect ratio of 60 means that the tires section height is 60 of the tires section width.
R indicates the construction used within the tires casing. 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.
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