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Aspect ratio calculator for tires code#

Aspect ratio calculator for tires code#

So, for the tire code shown in the figure above, P215/65R15, you would calculate the sidewall height as: sidewall height = profile ratio × width / 100.To calculate the sidewall height, we multiply the profile ratio by the tire width (dividing by 100 as the ratio is a percentage). 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. The first letter is optional, so you might not always see it.