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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. 0 inches | 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
▪ Convert P-Metric Tire to Inches
▪ Ring Pinion and Gear Ratio
▪ Speedometer Converter
▪ Find new Gear Ratio with new Tire Size
▪ Find Overall Crawl Ratio
▪ 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 |
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* These tables are for informational purposes only and are not intended as a guide to action.
For specific applicability of non-standard discs, please contact the vehicle manufacturer or vehicle dealer. We do not test wheel interchangeability and cannot make recommendations.
| Landing width of the disc | Minimum tire width | Optimum tire width | Maximum tire width |
|---|---|---|---|
| 5.0 inches | 155 mm | 165 or 175 mm | 185 mm |
| 5.5 inches | 165 mm | 175 or 185 mm | 195 mm |
| 6.0 inches | 175 mm | 185 or 195 mm | 205 mm |
| 6.5 inches | 185 mm | 195 or 205 mm | 215 mm |
| 7.0 inches | 195 mm | 205 or 215 mm | 225 mm |
| 7.5 inches | 205 mm | 215 or 225 mm | 235 mm |
8. 0 inches | 215 mm | 225 or 235 mm | 245 mm |
| 8.5 inches | 225 mm | 235 or 245 mm | 255 mm |
| 9.0 inches | 235 mm | 245 or 255 mm | 265 mm |
| 9.5 inches | 245 mm | 255 or 265 mm | 275 mm |
| 10.0 inches | 255 mm | 265 or 275 mm | 285 mm |
| 10.5 inches | 265 mm | 275 or 285 mm | 295 mm |
| 11.0 inches | 275 mm | 285 or 295 mm | 305 mm |
| 11.5 inches | 285 mm | 295 or 305 mm | 315 mm |
| 12.0 inches | 295 mm | 305 or 315 mm | 325 mm |
| 12.5 inches | 305 mm | 315 or 325 mm | 335 mm |
| Profile | Designation in metric dimension | Permissible range of landing width of the disc |
|---|---|---|
| 35 Series | 275/35R17 | 9. 0-10.5 |
| 335/35R17 | 11.0-13.0 | |
| 345/35R15 | 11.0-13.5 | |
| 40 Series | 285/40R15 | 11.0-13.5 |
| 215/40R15 | 7.0-8.5 | |
| 245/40R17 | 8.0-9.5 | |
| 255/40R17 | 8.5-10.0 | |
| 265/40R17 | 8.5-10.0 | |
| 235/40R18 | 8.0-9.5 | |
| 45 Series | 195/45/R15 | 6.5-7.5 |
| 215/45R15 | 7.0-8.5 | |
| 255/45R15 | 8.5-10.0 | |
| 205/45R16 | 7.0 | |
| 225/45R16 | 7.5-9.0 | |
| 245/45R16 | 8.0-9.5 | |
| 215/45R17 | 7.0-8.5 | |
| 235/45R17 | 8. 0-9.5 | |
| 255/45R17 | 8.5-10.5 | |
| 50 Series | 175/50R13 | 5.0-6.0 |
| 195/50R14 | 5.5-7.0 | |
| 205/50R15 | 5.5-7.5 | |
| 215/50R15 | 6.0-7.5 | |
| 225/50R15 | 6.0-8.0 | |
| 195/50R16 | 5.5-7.0 | |
| 205/50R16 | 5.5-7.5 | |
| 225/50R16 | 6.0-8.0 | |
| 235/50R16 | 6.5-8.5 | |
| 215/50R17 | 6.5-7.5 | |
| 55 Series | 205/55R14 | 5.5-7.5 |
| 185/55R15 | 6.0-6.5 | |
| 195/55R15 | 5.5-7.0 | |
| 205/55R15 | 5.5-7.5 | |
| 205/55R16 | 5. 5-7.5 | |
| 225/55R16 | 6.0-8.0 | |
| 60 Series | 185/60R13 | 5.0-6.5 |
| 205/60R13 | 5.5-7.5 | |
| 185/60R14 | 5.0-6.5 | |
| 195/60R14 | 5.5-7.0 | |
| 205/60R14 | 5.5-7.5 | |
| 195/60R15 | 5.5-7.0 | |
| 205/60R15 | 5.5-7.5 | |
| 215/60R15 | 6.0-7.5 | |
| 225/60R15 | 6.0-8.0 | |
| 235/60R15 | 6.5-8.5 | |
| 65 Series | 185/65R15 | 5.0-6.5 |
| 195/65R15 | 5.5-7.0 | |
| 205/65R15 | 5.5-7.5 | |
| 215/65R15 | 6.0-7.5 | |
| 70 Series | 165/70R10 | 4. 5-5.5 |
| 175/70R12 | 5.0-6.0 | |
| 175/70R13 | 5.0-6.0 | |
| 205/45R16 | 7.0 | |
| 185/70R13 | 5.0-6.5 | |
| 185/70R14 | 5.0-6.5 | |
| 195/70R15 | 5.5-7.0 | |
| 205/70R14 | 5.5-7.5 | |
| 185/70R15 | 5.0-6.5 | |
| 205/70R15 | 5.5-7.5 | |
| 215/70R15 | 6.0-7.5 | |
| 82 Series | 155R12 | 4.0-5.0 |
| 155R13 | 4.0-5.5 | |
| 165R13 | 4.0-5.5 | |
| 175R14 | 4.5-6.0 | |
| 185R14 | 4.5-6.0 | |
| 165R15 | 4.0-5.5 | |
| Profile | Designation in metric dimension | Permissible range of landing width of the disc |
|---|---|---|
| 75 Series | P205/75R15 | 5. 5-7.5 |
| P215/75R15 | 5.5-7.5 | |
| P225/75R15 | 6.0-8.0 | |
| P235/75R15 | 6.0-8.0 | |
| 80 Series | P155/80R13 | 4.5-5.5 |
| P165/80R13 | 4.5-6.0 | |
| P175/80R13 | 4.5-6.0 | |
| P185/80R13 | 5.0-6.5 | |
| 35 Series | P315/35R17 | 10.0-12.0 |
| 40 Series | P275/40R17 | 8.5-10.0 |
| 50 Series | P215/50R13 | 5.5-8.5 |
| P235/50R13 | 6.0-9.0 | |
| P245/50R14 | 6.5-9.0 | |
| P225/50R15 | 6.0-8.0 | |
| P295/50R15 | 7.5-11.0 | |
| P225/50R16 | 6. 0-8.0 | |
| P245/50R16 | 6.5-9.5 | |
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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 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.
