Calculate and compare the tire dimensions for any tire size (in mm and inches). The sidewall height is a percentage of the width of the tyre. Skip to secondary content. It also shows real tire sizes if such exist. So, the sidewall height of a Width * Please select your tyre width. By using this website you consent to our terms of service and cookies policy. The first number is the tire width in millimeters. This calculator also gives the option to compare tires. Tire Size Calculator. Use the comparison tab to see side by side comparison and speedometer error. The 2nd number is used to calculate the sidewall height or "aspect ratio", by percentage. From standard bias ply sizes such as 6.70-15 to Alpha Numeric sizes like F70-15, all the way up to modern P-Metric sizing, such as 205/75R15. Tire Size Comparison. Below is is a tyre conversion chart that show different size options you could possibly change your tyre size to but ensuring you keep the Rolling Road Circumference similar. Tire Size and Comparison Calculator Calculate tire diameter from code and compare speedometer differences for tire sizes. Our tyre calculator makes this happen for you. Enter a Tire Size [+] - or - 21" Tire Sizes . This second number is that percent. A ISO tire size of 28-622 is how we would refer to a 700 x 28C tire has a tire width of 28 mm and a rim diameter of 622 mm. Convert metric or inch tire sizes and view the results with our tire visualizer. Tire Sizes. It can also be written as 120/70Zx17TL or 120/70ZR17TL. Supports tire sizes in metric and inches. Our tire size comparison calculator will help you compare up to 10 additional sizes. A tire size converter at your convenience everyday anytime you want. Just type in a metric or standard size tyre and click calculate. Some manufacturers put the speed rating at the end of the size and do not indicate if the tire is tubeless or not. Search By. Use our tyre size calculator to calculate the diameter, width, sidewall, circumference, and revolutions per mile of any tyre. The second number on a metric tyre is to calculate the side wall measurement. In a tire with an aspect ratio of 85, for example, height is about 85% of the tire width. Original size . 80 The aspect ratio (the ratio of sidewall's section height to the tire's section width) in % (80%). The first number on a metric tyre is the width. There are many more possibilities and choices in metric tyres so the use of a tyre size calculator can come in handy. Just enter the size of tire you have now, then the new wheel size you want to go with and click "convert equivalent". About us. Use our tire size calculator to find tire size specs and suggested tire sizes. Tire sizes can be a bit confusing, as the size designations changed a lot over the years. Example: 285/75R16 (285 X 75 / 2540 x 2) + 16 = 32.8 inches tall. How to Read Tires Tire Tread Depth Tire Size Meaning FAQ. Also check out our tire size calculator and tire size comparison pages for a more detailed tire conversion. A tire size converter at your convenience everyday anytime you want. R The construction code (the radial construction). 'Low profile' tires have as aspect ratio of less than 80. It reads : 32 x 11.5 R 15 LT - total height of the tyres x width R diameter : 32 : Tyre diameter in inches. The sidewall and aspect ratio are used in metric sized tyres to determine the overall height of a tyre. We have a tire size converter for that too. Minilite; Revolution Alloy Wheels; Alloy Wheels for Ferrari; Alloys For Vans. R : Radial tyre. The Tire Size Converter performs tire size conversion from the inch tire size (English/Standard/Imperial measuring system) to the metric tire size and the other way around. So here you go. The comparison of tire sizes is the most common problem a customer must deal with when deciding what … Also browse our tire conversion charts to get ideas on tire conversion or to find the tire that is right for you. Look at our free to use tyre size calculator, used to compare the differences between you OE fit tyres and other alternatives. It also solves the problem of deciding what tyre you would like to run if you have inch measurements in mind but can't find a company that manufactures that inch size tyre. The table below lists most of the sizes of tyre that are likely to be found in the UK. The calculator above is based on the ISO/ETRTO (European Tyre and Rim Technical Organization) tire size which specifies tire size as a tire width and rim circumference in mm. The tire size comparison calculator takes the measurements of two tyres and compares the diameter, width, sidewall, circumference, and revolutions per mile. It also shows real tire sizes if such exist. Aside from the acceptable tyre diameter difference, you should also consider the various indexes and factors that represent a tyre’s suitability. Education . Need more help? 15-inch Wheel Conversion Chart. A tyre size conversion calculator or tyre diameter calculator are the best ways to get the answers you are looking for. Tire Size Calculator. Perform tire size conversion for any tire size, from the inch tire size to the metric tire size and the other way around with the tire size converter. Use the tyre calculator to populate a list of alternate tyre sizes. 22.5 11.5 : Tread width in inches. Enter the metric size (i.e. However, this will just show you all the theoretically possible sizes. There you go, the equal tire size on a different size wheel using the tire converter on the right. Click on each size to see available tires in that size. The chart below is for conversion of one type of size series with original inch sizes from the 60's and 70's. This has resulted in various size markings. The tire size we will use for our example is a 120/70ZR-17TL. Then as a bonus it shows examples of your speedometer reading with the first tyre, and the actual speed you"re traveling if you were to install the second tyre. As a rule, please only allow yourself a maximum of 2.5% difference +/-. The tool can be useful for finding out whether or not an alternative tire size is compatible with your vehicle. Motorcycle tyres are manufactured in a number of different countries with differing requirements in terms of load, dimensions and speed ratings. This is comparison calculator to compare diameter, width, sidewall, circumference and revolutions per mile. Tyre Calculator. In that case the size would look like this 120/70-17Z. Where you see a block of two or more compatible sizes, having the same bead diameter, you can assume that intermediate sizes exist that will also fit the same rim. What size tires do you need? Reference. What are Tire Size Calculator and Conversion Tools Benefits?