tire size detail
Intended Use Of Tire
Passenger Vehicle. When a tire size begins with a P, it signifies the tire is a p-metric size that was designed to be fitted on vehicles that are primarily used as passenger vehicles. This includes cars, minivans, sport utility vehicles and light duty pickup trucks (typically 1/4- and 1/2-ton load capacity). The use of p-metric sizes began in the late 1970s and they are the most frequently used type of tire size today.
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 195 indicates that this tire is 195 millimeters across from the widest point when mounted and measured on a specified width wheel. Because many people think of measurements in inches, the 195mm can be converted to inches by dividing the width in millimeters by 25.4 (the number of millimeters per inch).
195mm / 25.4 = 7.68"
The ratio of the height of the tire's cross-section to it's width. 65 means that the height is equal to 65% of the tire's width.
Typically, following the three digits identifying the tire's width in millimeters is a two-digit number that identifies the tire's profile or aspect ratio.
The 65 indicates that this tire size's sidewall height (from rim to tread) is 50% of its width. The measurement is the tire's section height, and also referred to as the tire's series, profile or aspect ratio. The higher the number, the taller the sidewall. The lower the number, the lower the sidewall. We know that this tire size's section width is 195mm and that its section height is 50% of 195mm. By converting the 195mm to inches (195 / 25.4 = 7.68") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of 3.84".
Radial. The R in the P195/65R15 89S 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 (P195/65R15 89S), 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 15 indicates the tire and wheel diameter designed to be matched together.
Tires that have a rim diameter expressed in inches (P195/65R15 89S, 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
1797lb load. The tire assigned numerical value used to compare relative load carrying capabilities.
The 89 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.
180mph. 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 (P195/65R15 89S) 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.
FCA US LLC (also called Fiat Chrysler or Chrysler) is the American subsidiary of Fiat Chrysler Automobiles N.V., an Italian controlled automobile manufacturer registered in the Netherlands with headquarters in London, U.K., for tax purposes. FCA US is one of the "Big Three" American automobile manufacturers. FCA US has its headquarters in Auburn Hills, Michigan and sells vehicles worldwide under its flagship Chrysler brand, as well as the Dodge, Jeep, and Ram Trucks. Other major divisions include Mopar, its automotive parts and accessories division, and SRT, its performance automobile division.
Walter Chrysler founded Chrysler Corporation in 1925 from the remains of the Maxwell Motor Company. He expanded the company in 1928 with the acquisition of Fargo Trucks and Dodge Brothers, and the creation of the Plymouth and DeSoto brands. Chrysler used the General Motors brand diversification and hierarchy strategy he had seen working for Buick.
Facing postwar declines in market share, productivity, and profitability, as GM and Ford were growing, Chrysler borrowed $250 million in 1954 from Prudential to pay for expansion and updated car designs.
In the 1960s the company expanded into Europe, by taking control of French, British and Spanish auto companies; Chrysler Europe was sold in 1978 to PSA Peugeot Citroën for $1.
Chrysler struggled through the 1970s to adapt to changing markets, increased US import competition, and safety and environmental regulation. The company began an engineering partnership with Mitsubishi Motors, and began selling Mitsubishi vehicles branded as Dodge and Plymouth in North America. By the late 1970s, Chrysler was on the verge of bankruptcy. It was saved by $1.5 billion in loan guarantees from the US government. New CEO Lee Iacocca was credited with returning the company to profitability in the 1980s. In 1985, Diamond-Star Motors was created, further expanding the Chrysler-Mitsubishi relationship.
In 1987, Chrysler acquired American Motors Corporation (AMC), which brought the profitable Jeep brand under the Chrysler umbrella.
In 1998, Chrysler merged with German automaker Daimler-Benz AG to form DaimlerChrysler; the merger proved contentious with investors. As a result, Chrysler was sold to Cerberus Capital Management and renamed Chrysler LLC in 2007.