Your safest solution is to choose equivalent options with the same rim diameter. Cars just aren’t designed to accommodate such great changes, which is why rules such as the 1.5% or -2% are regularly used. Similarly, you couldn’t go up from a 185/80 R13 to a 225/40 R18 tyre due to a look of space in the wheel arch. You can’t replace a standard 225/40 R18 tyre, for instance, with a 185/80 R13 tyre, as the smaller model would require 13 inch wheels that can’t fit the braking discs from the larger 18 inch wheels. Likewise, you need to be careful when changing the diameter of the tyre. As such, always keep the physical needs and parameters of your vehicle in mind. Our tyre calculator does not, for instance, take into account your specific car or model. Our tyre diameter calculator is a great tool for finding a new tyre size, but you should keep in mind some physical limitations. An alternative sizes can offer various improvements, such as a shorter braking distance, as well as drawbacks, so it is important to understand what it is you want from your car tyres.įind the correct tyre sizes for your vehicle. For most drivers, this is done to achieve or improve certain driving parameters on their vehicle. When it comes to these results, it is recommended that you only use options within 1.5% and -2%. ![]() Our tool gives this in percentages: a positive number is larger/wider, while a minus number represents a negative change. When using a tyre size comparison tool, it’s important to know the difference in the outer diameter. They are typically larger - upgrading in this way is referred to as plus sizing. Alternatives, on the other hand, have a different size. When it comes to choosing a new size, many drivers choose to stay within the same size and diameter - these tyres are known as equivalents. It can put your life in risk while you are driving.The tyre size calculator does not include information about car make and model. Please keep in mind your car's capabilities. 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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