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P Metric Tires
With the P-Metric system, Section Width is measured in millimeters. To convert millimeters into inches, divide by 25.4. The Aspect Ratio (Section Height divided by Section Width) helps to provide more dimensional information about the tire size.

Aspect ratio is expressed as a percentage (75%, 70%, 60%) & is commonly referred to as the tire series (75, 70, 60 series). Lower aspect ratio tires tend to look shorter & wider.

From the examples below, you can determine each tire's Section Width (7.28/8.07") & Section Height (5.46/4.84").

 

P18570R14

P

Passenger Car Tire

185

Section Width (in millimeters)
(Conversion: 185 mm ÷25.4 = 7.28")

70

Aspect Ratio (Conversion: 7.28" X .70 = 5.10" Section Height)

R

Radial Construction
(B-bias, D-diagonal)

14

Rim diameter in inches


205/60R15

205

Section Width in millimeters
(Conversion: 205 mm ÷25.4 = 8.07")

60

Aspect Ratio
(Conversion: 8.07" X .60 = 4.84" Section Height)

R

Radial Construction

15

Rim diameter in inches




 
NOTE: The dimensions in the sizes noted are nominal. This means they are figured from the number for that size. Actual dimensions may vary by manufacturer from the actual dimensions in the size because of tolerances allowed.


As the example below illustrates, Overall Diameter can now be determined by adding the sidewall heights (Section Height) & the rim diameter.

P185/70R14
Conversion
(5.10" + 5.10") + 14" = 24.2" 		205/60R15
Conversion
(4.84" +4.84") + 15" = 24.68"
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