![]() 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. It can put your life in risk while you are driving.The first letter is optional, so you might not always see it. It is because we do not recommend using the tires which differ from your current tires in size more than 3%. If the difference in diameters is bigger than 3%, the result will be in red. Depending on the difference of tires, it can be in green or in red. At the bottom of the table you can see the final recommendation. Tire size comparison calculator instantly shows the difference between the tires and displays it in the table. Our tire size calculator uses inch measurements by default, but you can switch to metric system (cm) if you want. After you have entered all the parameters, click the green button "Calculate". In the second row you need to specify the size of the new tires, or the tires that you are going to buy. The third field is for disc diameter in inches. The second box is for height and width ratio in percentages. In the first box you need to choose tire width in inches. These indicators can be easily found on the sidewalls of your tires. In the top row you need to select the size of the tires that are on your car at the moment. ![]() This calculator allows you to tell the difference between the tires in inches, centimeters, and percentages. Our tire size calculator will help you estimate the difference of external dimensions of the wheels, height clearance, revolutions per mile and other characteristics, when installing tires of other sizes on your vehicle. Online tire size comparison calculator – choose the right tires for your car
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