![]() Convert Metric to Imperial or Imperial to Metric Comparison between two tire (tyre) sizes, either can be metric or imperial. Only calculator that will let you compare metric tire (tyre) sizes with Imperial (US) tire sizes, automatically converts mm into inches. Suitable for Cars, SUVs, 4x4s, Buses, Trucks, ATVs and Bikes. Light truck tires (LT) are not speed rated.The most comprehensive tire (tyre) comparison tool and size calculator on the store. Note: Speed ratings are specific for passenger car tires and not light truck tires. Speed Rating – This is a number that corresponds to the maximum service speed for a tire. You will also find the maximum load in pounds and in kilograms molded elsewhere on the tire sidewall. Load Index – This is a number corresponds to the maximum load in pounds that a tire can support when properly inflated. This measurement is in inches and an example would be 15 and indicates that this tire is for a 15 inch rim, or wheel. This is measured from one bead across the opening to the other side of the same bead. Wheel Diameter – This is the width of the opening in the tire where it would be mounted to a wheel. For more information about bias ply type tires, click here. B indicates the tire is a bias ply type tire. For more information about what a radial is, click here. R indicates the tire is a radial type tire. Example: 5.5 x 2 + 15 (rim size in inches) = a 26 inch tall tire.Ĭonstruction – This indicates how the how the tire was put together and will say much about the tires handling characteristics. Then take the inches and multiply by two and add the rim size. #Tire metric to standard calculator full#To convert the aspect ratio to a full tire height in inches, do this:Ĭonvert the above calculated tire height (aspect ratio) in millimeters to inches by multiplying the millimeters by. This is the height of the rubber from rim to tread on one side of the tire. Using the example numbers the tires aspect ratio would calculate as 215x.65=139.75 where 139.75 is the tires height in millimeters. 215) by the second number with a decimal before the number (e.g.65). To calculate the aspect ratio, multiple the first number (e.g. An example of this might be 65, which means that the height is equal to 65% of the tire’s width. An example might be 215 representing 215 millimeters.Īspect Ratio – This is the ratio of the height of the tire’s cross-section to its width. Tire Width – This is the width of the tire measured in millimeters from sidewall to sidewall. P indicates this is a passenger car tire while LT indicates the tire would be for a light truck with a heavier load rating. Tire Type – This Defines the intended proper use of the tire. The following will help you understand what this information means. Some of the information is self explanatory while other information requires a little knowledge to decipher. Rim SizeĪll tires are required to have certain information molded into the side of the tire in a location known as the sidewall. If you need to know the actual p-metric tire size and the equivalent measurements in inches for a specific tire, check with the manufacturer’s actual dimensions per individual tire brand before purchasing. This chart is for an estimated conversion and the actual advertised tire height and tread width will vary from manufacturer to manufacturer. The values shown are calculated measurements based on the p-metric formula, which is explained below on this page. The following chart lists common p-metric tires sizes and the converted tread width and the actual tire height in inches. Guide to P-Metric Tire Sizes, Conversion Chart and Tire Terminology – P-Metric to Inches ![]()
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