models


245

Intended Use Of Tire

.


mm wide

Tire Width

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"

40%

Aspect Ratio

The ratio of the height of the tire's cross-section to it's width. 40 means that the height is equal to 40% 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 40 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 mm and that its section height is 50% of mm. By converting the mm to inches ( / 25.4 = NaN") and multiplying it by 50% (.50) we confirm that this tire size results in a tire section height of NaN".

R

Construction Method

Radial. The R in the 245/40R18 93V(Front)275/40R18 99V(Rear) 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 (245/40R18 93V(Front)275/40R18 99V(Rear)), 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.

18" wheel

Rim Size

The 18 indicates the tire and wheel diameter designed to be matched together.

Tires that have a rim diameter expressed in inches (245/40R18 93V(Front)275/40R18 99V(Rear), 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.

40

Load Range/Ply Rating

This tire has a ply rating of which indicates how much load the tire is designed to carry at it's specified pressure.

R

Load Index/Service Description

NaNlb load. The tire assigned numerical value used to compare relative load carrying capabilities.

The R 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.

18

Speed Rating

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 (245/40R18 93V(Front)275/40R18 99V(Rear)) 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.

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avanti

The Avanti is an American performance sports coupe based on the Studebaker Avanti and marketed through a succession of five different ownership arrangements subsequent to Studebaker's discontinuation of the model. After the closure of Studebaker's South Bend factory on December 20, 1963, cars carrying the Avanti nameplate were initially produced from left-over Studebaker components and later, by the Avanti Motor Company from General Motors and Ford chassis and engines. Very few cars were made before all production ceased in 2006. Wikipedia