What do the numbers stand for? 215/70R15 - AutoPedia� Bulletin Board System: "
Secret tire decoder ring:
For a "P215/70R15":
"P" is for Passenger tire and indicates that the size and load information is generated by the Tire & Rim Association of America. "LT" is light truck in T&RA. If there is no letter before the numbers start, it is usually under the auspices of the European Tire and Rim Technical Organization (ETRTO).
"215" is the nominal section in mm at 70% rim width. So, ideally, if that tire is mounted on a rim that is 70% of 215 mm, that tire would be 215 mm wide.
"70" is the aspect ratio of the section height. Such that the design section height of the tire is 70% of the nominal section.
"R" is for Radial tire (can also be "D" for bias, don't ask me why).
"15" is the diameter of the rim."
'via Blog this'
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