Tire plus size calculator

Code or from measuring into the first three fields of the calculator. You may also specify the construction type of the tire, though it will not affect any tire's size dimensions.You will then see confirmation of the tire code.As a result, you will see the tire diameter, sidewall height, circumference, and the number of revolutions completed per mile.Don't forget to click on the units to switch to your preferred unit for each input and output.Want to compare one tire with another one? Then tick the "Compare with another tire" checkbox at the end of the first tire's details. The same inputs and outputs will appear for the second tire.At the end of the tire size conversion calculator, you will see the absolute difference in the diameters of the two tires and the corresponding percentage change. Note that if you are looking to put this second tire on your vehicle, the difference in tire diameter should be no more than 2.5% smaller or larger. If it is larger, the tire might foul the wheel arch of your car, or the tire may be too weighty for the car's suspension and shock absorbers. Too small a tire size may mean the vehicle's ground clearance is not practical (scrapping speed bumps) anymore.Changing the tire diameter will also affect the speedometer reading when compared to the actual speed of the car. Fortunately, this is also a tire size speedometer calculator too! Enter a speed into the "Speedometer reading" row, and you see the actual speed displayed. This information could be important when keeping to speed limits. If it is a modern vehicle, you might be able to set the tire diameter size in the car's electronics system. Your garage should be able to help you out, depending on the make and model of your vehicle.✅ Now that you know your tire size, you can use it in the speedometer gear calculator to find the right gear for your vehicle, too!Example of tire size comparisonLet's take a more in-depth look at the tire comparison feature by comparing two tires with the tire codes 195/65R15 and 195/85R15. If you enter these values into the tire size calculator, we can check them out in more detail.The diameter calculated for the first tire is 25 inches, and the second one is just over 28 inches in diameter. That's a difference of over 3 inches. You'll see that's a

Market share. Here is a summary of radial and some other constructions you may see:R: radial – cords that make up the structure of the tire are at right angles to the direction of travel;D: diagonal (or cross-ply) – cords are at an angle diagonal to the direction of travel;B: bias belt – same as diagonal, but with an extra layer of reinforcing belts under the tread; andIf no letter is present, a diagonal tire construction is assumedThe wheel diameter is indicated by the final 1- or 2- digit number, in inches. You might also see the wheel (or rim) diameter given to an accuracy of half an inch. In some rare cases, the number is three digits long. In that case, it represents the wheel diameter in millimeters.So that's the tire code and tire size explained.If you found this calculator useful our fuel cost calculator may also be of interest to you.How to calculate tire size?Let's learn how to find tire sizes. 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.To calculate the sidewall height, we multiply the profile ratio by the tire width (dividing by 100 as the ratio is a percentage). The formula is, therefore:sidewall height = profile ratio × width / 100So, for the tire code shown in the figure above, P215/65R15, you would calculate the sidewall height as:sidewall height = 65 × 215 / 100 = 139.75 mmConverting to inches (divide by 2.54 × 10), that's 5.5 inches. We know the diameter of the wheel is 15 inches, so the diameter of the tire is given by:tire diameter = wheel diameter + (2 × sidewall height)So, for our example, that's:tire diameter = 15 + (2 × 5.5) = 26 inchesTo calculate the circumference, we use the classic circle equation:circumference = π × diameterSo, for our exemplary tire, the tire circumference is:circumference = 3.1416 × 26 = 81.7 inchesOur tire size calculator can also tell you how many revolutions a tire completes in a mile (or kilometer). This value is found by converting a mile into inches and dividing the result by the tire's circumference:revolutions number = 63360 / 81.7 = 776How to use the tire size calculatorUsing our tire size calculator is easy:Enter the values for the tire's width, profile ratio, and wheel size diameter obtained from either the tire

Last updated: Jul 29, 2024Using our tire size calculator, you can find the tire measurements of your car tire, such as its diameter, sidewall height, and circumference. It's also a tire size comparison calculator, allowing you to compare your current tire with the one you are thinking of buying. It tells you whether the new tire will be a good fit, and how it might affect your speed dial.The text below also explains:How tire sizes work;What the tire code you see on your tire means; andHow to use our tire size calculator to compare tires.So let the tremendous tire comparison begin!How do tire sizes work?You've probably seen this strange set of numbers and letters on your car's tires and wondered what they mean. It's called a tire code, and it specifies the size and type of tire. Getting properly sized parts for your vehicle is crucial, so make sure to visit the wheel offset calculator to get that right, too.Let's go through each part of the code and make you a tire code expert.By F l a n k e r – Own work, CC BY 3.0, wikimedia.org. Modified version, focusing on the tire size code.The first letter is optional, so you might not always see it. It gives information about the intended use or the class of vehicle the tire fits. Possible values are:P: Passenger carLT: Light TruckST: Special TrailerT: Temporary (e.g., "space-saver" spare wheels)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"). Expect the width of the tire actually in contact with the road to be smaller than this value.Next is a forward-slash for character separation, then there's a 2- or 3-digit number representing the profile of the tire. This number is the ratio of sidewall height to the tire's width as a percentage (also called the aspect ratio). So, for example, if the value was 50%, the sidewall height would be half of the width. If it is not present, you can assume a profile ratio of 82%. If the number is more than 200, then it represents the tire's diameter in millimeters.Following the profile ratio, you may see an optional letter indicating the type of tire construction. Radial (R) is now the most common and the standard design for car tires today, with over a 98%

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

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