- Tire metric to standard calculator driver#
- Tire metric to standard calculator code#
Tire metric to standard calculator code#
We've got the tire code and the data required for us to calculate various tire measurements, such as the tire diameter and sidewall height. If you found this calculator useful our fuel cost calculator may also be of interest to you. So that's the tire code and tire size explained. In that case, it represents the wheel diameter in millimeters. In some rare cases, the number is three digits long. You might also see the wheel (or rim) diameter given to an accuracy of half an inch. The wheel diameter is indicated by the final 1- or 2- digit number, in inches.
If no letter is present, a diagonal tire construction is assumed. B: bias belt – same as diagonal, but with an extra layer of reinforcing belts under the tread and. D: diagonal (or cross-ply) – cords are at an angle diagonal to the direction of travel. 
R: radial – cords that make up the structure of the tire are at right angles to the direction of travel. Here is a summary of radial and some other constructions you may see: Radial ( R) is now the most common and the standard design for car tires today, with over a 98% market share. If the number is more than 200, then it represents the tire's diameter in millimeters.įollowing the profile ratio, you may see an optional letter indicating the type of tire construction. If it is not present, you can assume a profile ratio of 82%. So, for example, if the value was 50%, the sidewall height would be half of the width. This number is the ratio of sidewall height to the tire's width as a percentage (also called the aspect ratio). Next is a forward-slash for character separation, then there's a 2- or 3-digit number representing the profile of the tire. Expect the width of the tire actually in contact with the road to be smaller than this value. Up next is a 3-digit number that indicates the width of the tire in millimeters, measured at the widest point of the sidewall (technically called the " nominal section width"). T: Temporary (e.g., "space-saver" spare wheels). It gives information about the intended use or the class of vehicle the tire fits. Finally, like the first set of numbers, that R15 means it is a radial tire and has a 15" diameter.įor those who have the metric reading on their tires, you can simply plug that into the conversion calculator to determine the tire size, or find that corresponding reading on one of the below conversion charts.The first letter is optional, so you might not always see it. That 75 is the tire's aspect ratio and simply means the tire's height is equal to 75 percent of its width. From left to right, the P indicates a passenger tire while 265 indicates the tires width in millimeters. 
The second listing is a metric set up, and is what is more common on factory-type sized tires. That third reading is the tire type as radial and diameter as 17". That first number is your tire size at 35", and then the second number tells you the tire width at 12.5". If it is the first listing, then here is the breakdown. For example, it could simply say 35x12.5 R17, or it may show as P265 75 R15. Now, this information could read in a few different ways. All tires are required to have this information, regardless of the manufacturer brand name. So here is some helpful information to assist you in determining what you currently have on the vehicle.įirst, the sidewall of your tire contains all the information needed to understand everything about that specific tire.
Tire metric to standard calculator driver#
And while a stock tire size is imprinted right inside the driver side B pillar, you may not know what if have if you are not the original owner. Knowing your Jeep's tire size can be essential information when it comes time to replace that rubber, or even if you ever decide to change wheels.
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