tire size detail
Intended Use Of Tire
Following the letter(s) that identify the type of vehicle and/or type of service for which the tire was designed, the three-digit numeric portion identifies the tire's section width/cross section in millimeters.
The indicates that this tire is millimeters across from the widest point when mounted and measured on a specified width wheel. Because many people think of measurements in inches, the mm can be converted to inches by dividing the width in millimeters by 25.4 (the number of millimeters per inch).
mm / 25.4 = NaN"
. The R in the size identifies that the tire has a radial construction in which the tire's plies "radiate" out from the center of the wheel. Radial tires are by far the most popular type of tire today representing over 98% of all tires sold.
If the R in the size was replaced with a D (), it would identify that the internal tire body plies crisscross on a diagonal and that the tire has a "bias ply" construction. Tires using this construction are for light truck and spare tire applications.
The indicates the tire and wheel diameter designed to be matched together.
Tires that have a rim diameter expressed in inches (, as well as 8, 10, 12, 13, 14,15, 17, 18, 19, 20, 22, 23, 24, 26 and 28) are called "inch rim" sizes. These are the most common types of tire sizes and are used on most cars, minivans, vans, sport utility vehicles and light duty light trucks.
Tires and wheels with unique rim diameters should never be combined with traditional "inch rim" tires and wheels.
Load Index/Service Description
NaNlb load. The tire assigned numerical value used to compare relative load carrying capabilities.
The represents the tire's service description. A service description identifies the tire's load index and speed rating. Service descriptions are required on all speed rated (except for Z-speed rated) tires manufactured since the early 1990s.
mph. The maximum speed that the tire can sustain for 10 minutes.
Today, the only tires that continue to include the speed rating "in" the tire size () are Z-speed rated tires. In this case, following the two digits used to identify the aspect ratio are the letters ZR to identify the tire's speed rating (Z) and its internal construction (R). Since 1991, all other speed ratings are identified in the tire's Service Description.
Chevrolet, colloquially referred to as Chevy and formally the Chevrolet Division of General Motors Company, is an American automobile division of the American manufacturer General Motors (GM). Louis Chevrolet and ousted General Motors founder William C. Durant started the company on November 3, 1911  as the Chevrolet Motor Car Company. Durant used the Chevrolet Motor Car Company to acquire a controlling stake in General Motors with a reverse merger occurring on May 2, 1918 and propelled himself back to the GM presidency. After Durant's second ousting in 1919, Alfred Sloan, with his maxim "a car for every purse and purpose," would pick the Chevrolet brand to become the volume leader in the General Motors family, selling mainstream vehicles to compete with Henry Ford's Model T in 1919 and overtaking Ford as the best-selling car in the United States by 1929.
Chevrolet-branded vehicles are sold in most automotive markets worldwide, with the notable exception of Oceania, where GM is represented by its Australian subsidiary, Holden. In 2005, Chevrolet was relaunched in Europe, primarily selling vehicles built by GM Daewoo of South Korea with the tagline "Daewoo has grown up enough to become Chevrolet", a move rooted in General Motors' attempt to build a global brand around Chevrolet. With the reintroduction of Chevrolet to Europe, GM intended Chevrolet to be a mainstream value brand, while GM's traditional European standard-bearers, Opel of Germany, and Vauxhall of United Kingdom would be moved upmarket. However, GM reversed this move in late 2013, announcing that the brand would be withdrawn from Europe, with the exception of the Camaro and Corvette in 2016. Chevrolet vehicles will continue to be marketed in the CIS states, including Russia. After General Motors fully acquired GM Daewoo in 2011 to create GM Korea, the last usage of the Daewoo automotive brand was discontinued in its native South Korea and succeeded by Chevrolet.
In North America, Chevrolet produces and sells a wide range of vehicles, from subcompact automobiles to medium-duty commercial trucks. Due to the prominence and name recognition of Chevrolet as one of General Motors' global marques, Chevrolet, Chevy or Chev is used at times as a synonym for General Motors or its products, one example being the GM LS1 engine, commonly known by the name or a variant thereof of its progenitor, the Chevrolet small-block engine.