(F) Tire Ply Material : The type of cord andnumber of plies in the sidewall and underthe tread.(G) Single Tire Maximum Load : Maximum loadthat can be carried and the maximum pressureneeded to support that load when used as asingle. For information on recommended tirepressure see Inflation - Tire Pressure onpage 6‑59.Tire SizeThe following illustration shows an example of atire size.(A) P‐Metric Tire : The United States version of ametric tire sizing system. The letter P as the firstcharacter in the tire size means a passengervehicle tire engineered to standards set bythe U. S. Tire and Rim Association.(B) Tire Width : The three‐digit number indicatesthe tire section width in millimeters from sidewallto sidewall.(C) Aspect Ratio : A two‐digit number thatindicates the tire height‐to‐width measurements.For example, if the tire size aspect ratio is 60, asshown in item C of the illustration, it would meanthat the tire's sidewall is 60 percent as high as itis wide.(D) Construction Code : A letter code is used toindicate the type of ply construction in the tire.The letter R means radial ply construction; theletter D means diagonal or bias ply construction;and the letter B means belted‐bias plyconstruction.(E) Rim Diameter : Diameter of the wheel ininches.(F) Service Description : These charactersrepresent the load index and speed rating of thetire. The load index represents the load carrycapacity a tire is certified to carry. The speedrating is the maximum speed a tire is certified tocarry a load.6-55InformationProvidedby:
