Black plate (52,1)Cadillac SRX Owner Manual (Include Mex) - 201210-52 Vehicle CareTire DesignationsTire SizeThe following is an exampleof a typical passenger vehicletire size.(A) Passenger (P‐Metric) Tire :The United States version ofa metric tire sizing system.The letter P as the firstcharacter in the tire sizemeans a passenger vehicletire engineered to standardsset by the U.S. Tire and RimAssociation.(B) Tire Width : The three‐digitnumber indicates the tire sectionwidth in millimeters fromsidewall to sidewall.(C) Aspect Ratio : A two‐digitnumber that indicates the tireheight‐to‐width measurements.For example, if the tire sizeaspect ratio is 60, as shown initem C of the illustration, it wouldmean that the tire's sidewall is60 percent as high as it is wide.(D) Construction Code :A letter code is used to indicatethe type of ply construction inthe tire. The letter R meansradial ply construction; theletter D means diagonal orbias ply construction; and theletter B means belted‐bias plyconstruction.(E) Rim Diameter : Diameter ofthe wheel in inches.(F) Service Description :These characters represent theload index and speed rating ofthe tire. The load indexrepresents the load carryingcapacity a tire is certified tocarry. The speed rating is themaximum speed a tire iscertified to carry a load.
