Offroaders Staff Technical & Info
Offroaders.com Guide to P-Metric Tire Sizes, Conversion Chart and Tire Terminology – P-Metric to Inches
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.
| Rim Size | P-Metric Size | Tread Width | Actual Tire Height |
| 15 Inch | 205/70R15 | 8. | 26.3 inches |
| 215/75R15 | 8.46 inches | 27.7 inches | |
| 235/75R15 | 9.25 inches | 28.9 inches | |
| 265/70R15 | 10.4 inches | 29.6 inches | |
| 16 Inch | 225/75R16 | 8.8 inches | 29.3 inches |
| 235/85R16 | 9.25 inches | 31.7 inches | |
| 245/75R16 | 9. 6 inches | 30.5 inches | |
| 265/70R16 | 10.4 inches | 30.6 inches | |
| 265/75R16 | 10.4 inches | 31.6 inches | |
| 285/75R16 | 11.2 inches | 32.8 inches | |
| 305/70R16 | 12.0 inches | 32.8 inches | |
| 315/75R16 | 12.4 inches | 34.6 inches | |
| 345/75R16 | 13.6 inches | 36. 4 inches | |
| 17 Inch | 235/65R17 | 9.25 inches | 29.0 inches |
| 245/70R17 | 9.6 inches | 30.5 inches | |
| 255/75R17 | 10.0 inches | 32.0 inches | |
| 255/80R17 | 10.0 inches | 33.0 inches | |
| 265/70R17 | 10.4 inches | 31.6 inches | |
| 275/70R17 | 10. 8 inches | 32.2 inches | |
| 285/70R17 | 11.2 inches | 32.7 inches | |
| 285/75R17 | 11.2 inches | 33.8 inches | |
| 305/65R17 | 12.0 inches | 32.6 inches | |
| 315/70R17 | 12.4 inches | 34.4 inches | |
| 18 Inch | 265/60R18 | 10.4 inches | 30.5 inches |
| 275/65R18 |
10. 8 inches | 32.1 inches | |
| 275/70R18 | 10.8 inches | 33.2 inches | |
| 285/75R18 | 11.2 inches | 34.8 inches | |
| 295/65R18 | 12.6 inches | 33.1 inches | |
| 305/60R18 | 12.0 inches | 32.4 inches | |
| 305/70R18 | 12.0 inches | 34.8 inches | |
| 20 Inch | 275/60R20 | 10. 8 inches | 33.0 inches |
| 275/65R20 | 10.8 inches | 34.0 inches | |
| 285/60R20 | 11.2 inches | 33.4 inches | |
| 285/65R20 | 11.2 inches | 34.5 inches | |
| 295/55R20 | 12.6 inches | 32.8 inches | |
| 295/60R20 | 11.6 inches | 33.9 inches | |
| 305/55R20 | 12.0 inches | 33. 2 inches | |
| 325/60R20 | 12.8 inches | 35.3 inches |
Other 4×4 Related Calculators
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▪ Find MPH
▪ Find RPM
▪ Convert P-Metric Tire to Inches
All tires are required to have certain information molded into the side of the tire in a location known as the sidewall. Some of the information is self explanatory while other information requires a little knowledge to decipher. The following will help you understand what this information means.
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:
Convert the above calculated tire height (aspect ratio) in millimeters to inches by multiplying the millimeters by .03937 (139.
75 x .03937 = 5.5 inches). Then take the inches and multiply by two and add the rim size. Example: 5.5 x 2 + 15 (rim size in inches) = a 26 inch tall tire.
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.
Rating | Maximum Speed |
| Q | 99 mph |
| S | 112 mph |
| T | 118 mph |
| U | 124 mph |
| H | 130 mph |
| V | 149 mph |
| W | 168 mph |
| Y | 186 mph |
| Z | Above 149 mph |
The 265/70R17 equivalent to 31.
6x10.4R17 in inches, as follow:
| Inches | Metric | |
| Diameter | 31.6" | 803 mm |
| Tread Width | 10.4" | 265 mm |
| Rim Diameter | 17" | 432 mm |
| Sidewall Height | 7.3" | 186 mm |
| Circumference | 99.6" | 2530 mm |
| Revolutions | 636" | 395 mm |
99.6"
636 Revs/Mile
The 265/70R17 has a width of 10.
4 inches or 265 mm wide. This is the measurement of the tire at its thickest point, the distance between the inner sidewall’s widest point and the outer sidewall’s widest point. This physical width of the tire can change if the tire is mounted on a wheel slightly wider or narrower than the size indicated by the rim width.
The 265/70R17 has an overall diameter of 31.7 inches or 804 mm tall (measured from the outside edges of the wheel)
The size rim of a 265/70R17 tire is 17 inches or 432 mm tall. This number represents the distance between the two bead seat areas where the tire is sealed onto the wheel.
The sidewall height of a 265/70R17 is 6.8 inches or 186 mm tall. It’s measured from the wheel rim to the top of the tread, expressed as a percentage of tire width.
265/70R17 tire has a circumference of 99.
6 inches or 2530 mm
The 265/70R17 performs 395 revolutions per kilometer or 636 revolutions per mile. Revolutions per mile indicate the number of times a tire revolves while it covers the distance of one mile/kilometer
You can replace the 265/70R17 tires that are within ±3% of the overall tire diameter. In this case, it’s between 30.7 and 32.7 inches (780mm to 828 mm). Check our tire size chart here or the tire size calculator tool here to find your size.
36" Tire Diameter
American and European tires are distinguished by their markings. European tires have a metric marking system. Therefore, when replacing tires, the problem of translating tire parameters may arise.
In most cases, this is the conversion of inches to centimeters. Enter the size in inches and click calculate. You will see the tire size in meters (dimensions will be rounded to European parameters).
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Comparison: inch and meter sizes When you enter the old inch parameters and new European ones, you can see how the external parameters of the tire and ground clearance will change, as well as differences in the speedometer readings. |
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Thanks to the Tire Calculator, you can do the reverse calculation - convert "cm" and "mm" to inches.
To do this, you must enter the size, diameter, width and height of the tire profile and click the "calculate" button. The calculator will convert the values to inches.
| Attention! This R-metric calculator is used to convert European tire size to US tire size. But you can also use it to convert a tire from "inch" style to R-metric. Some dimensions may not be translated correctly (for example, the metric tire dimensions are 33x12.50x15 when converted to R-metric 318/72 R15, but if you translate the dimensions back, you will see 33x12.52x15). This may be due to minor rounding errors. |
For example, 175 70 13 summer Belshina
0 (800) 300-568, (044) 4981-568 (098) 0000-568, (093) 0000-568 Problems with your order?
66780 |
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With this calculator, you can convert US inches to European metric and vice versa.
To obtain a metric size, enter the values in the "Inches" fields, and to obtain a size in inches, fill in the "Metric" fields.
For example, 31x10.5 R15 tires correspond to 265/75 R15 tires
Source: autoshini.com
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