P-Metric (example 1) P215/65R15 95S
P = Passenger Car
215 = Section width measured in millimeters (25.4 millimetes per inch)
65 = Aspect Ratio, which means the sidewall height is 65 percent of the section width.
R = Radial Carcass Construction
15 = Rim Diameter
95 = Load Index
S = Speed Rating - View Speed Rating Chart Below
A. Passenger car tire.
B. Width of tire diameter.
C. Ratio of height to width.
D. Radial.
E. Diameter of wheel in inches.
F. Load index & speed symbol
G. U.S. DOT safety standard code.
H. Max. cold inflation & load limit.
I. Treadwear, traction and temperature grades.
J. Tire ply composition and materials used.
The image below breaks down all the different components that make up the basic tire from the outer tread into the inner bead wires.
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