Black plate (54,1)Cadillac DTS Owner Manual - 2011(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) Load Range : Load Range.(G) Service Description : The service descriptionindicates the load index and speed rating of atire. If two numbers are given as in the example,120/116, then this represents the load index forsingle versus dual wheel usage (single/dual).The speed rating is the maximum speed a tire iscertified to carry a load.Tire Terminology and DefinitionsAir Pressure : The amount of air inside the tirepressing outward on each square inch of the tire.Air pressure is expressed in pounds per squareinch (psi) or kilopascal (kPa).Accessory Weight : This means the combinedweight of optional accessories. Some examples ofoptional accessories are, automatic transmission,power steering, power brakes, power windows,power seats, and air conditioning.Aspect Ratio : The relationship of a tire's height toits width.Belt : A rubber coated layer of cords that islocated between the plies and the tread. Cordsmay be made from steel or other reinforcingmaterials.Bead : The tire bead contains steel wires wrappedby steel cords that hold the tire onto the rim.Bias Ply Tire : A pneumatic tire in which the pliesare laid at alternate angles less than 90 degreesto the centerline of the tread.Cold Tire Pressure : The amount of air pressurein a tire, measured in pounds per square inch (psi)or kilopascals (kPa) before a tire has built up heatfrom driving. See Inflation - Tire Pressure onpage 6‑57.Curb Weight : The weight of a motor vehicle withstandard and optional equipment including themaximum capacity of fuel, oil, and coolant, butwithout passengers and cargo.6-54
