Offroaders.com Guide to P-Metric Tire Sizes, Conversion Chart and Tire Terminology – P-Metric to Inches Show The following chart lists common p-metric tires sizes and the converted tread width and the actual tire height in inches. The values shown are calculated measurements based on the p-metric formula, which is explained below on this page. This chart is for an estimated conversion and the actual advertised tire height and tread width will vary from manufacturer to manufacturer. 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.
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Reading a Tire:
Tire Type – This Defines the intended proper use of the tire. 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 Width – This is the width of the tire measured in millimeters from sidewall to sidewall. An example might be 215 representing 215 millimeters. Aspect Ratio – This is the ratio of the height of the tire’s cross-section to its width. An example of this might be 65, which means that the height is equal to 65% of the tire’s width. To calculate the aspect ratio, multiple the first number (e.g. 215) by the second number with a decimal before the number (e.g. .65). Using the example numbers the tires aspect ratio would calculate as 215x.65=139.75 where 139.75 is the tires height in millimeters. This is the height of the rubber from rim to tread on one side of the tire. To convert the aspect ratio to a full tire height in
inches, do this: Construction – This indicates how the how the tire was put together and will say much about the tires handling characteristics. R indicates the tire is a radial type tire. For more information about what a radial is, click here. B indicates the tire is a bias ply type tire. For more information about bias ply type tires, click here. Wheel Diameter – This is the width of the opening in the tire where it would be mounted to a wheel. This is measured from one bead across the opening to the other side of the same bead. This measurement is in inches and an example would be 15 and indicates that this tire is for a 15 inch rim, or wheel. Load Index – This is a number corresponds to the maximum load in pounds that a tire can support when properly inflated. You will also find the maximum load in pounds and in kilograms molded elsewhere on the tire sidewall. Speed Rating – This is a number that corresponds to the maximum service speed for a tire. See Chart for ratings. Note: Speed ratings are specific for passenger car tires and not light truck tires. Light truck tires (LT) are not speed rated.
Are 33 inch tires the same as 275?Tires that measure 275/60 R20 are equivalent to the 33-inch.
What size is 275 in tire?"275/35R19" means the tire is 275 mm wide, has an aspect ratio (that is, the width divided by the height) of 35%, and fits on a 19" wheel. You can figure out the height of the sidewall by multiplying the section width (275) times the aspect ratio (35%). The sidewall height of our example tire would be 275 * .
What is a 33 inch tire?The 33” refers to the width of the tire (285) multiplied by the height percentage of the sidewall (75), in millimeters, x2 because there are two sidewalls, divided by 25.4 (inches) plus the wheel size in inches (16”).
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