Chevrolet 2004 Epica Spezifikationen PDF herunterladen (Seite 244)

Tire Size

The following illustration shows an example of a typical

passenger car tire size.

(A) Passenger (P-Metric) Tire: The United States

version of a metric tire sizing system. The letter “P” as

the ﬁrst character in the tire size means a passenger

vehicle tire engineered to standards set by the U. S. Tire

and Rim Association.

(B) Tire Width: The three-digit number indicates the

tire section width in millimeters from sidewall to sidewall.

the tire height-to-width measurements. For example, if

the tire size aspect ratio is “70,” as shown in item “C”

of the illustration, it would mean that the tire’s sidewall

is 70% as high as it is wide.

(D) Construction Code: A letter code is used to

indicate the type of ply construction in the tire. The letter

“R” means radial ply construction; the letter “D” means

diagonal or bias ply construction; and the letter “B”

means belted-bias ply construction.

(E) Rim Diameter: Diameter of the wheel in inches.

(F) Service Description: These characters represent

the load range and the speed rating of a tire. The load

range represents the load carry capacity a tire is certiﬁed

to carry. The speed rating is the maximum speed a tire

is certiﬁed to carry a load. Speed ratings range from

“A” to “Z”.

Tire Terminology and Deﬁnitions

Air Pressure: The amount of air inside the tire pressing

outward on each square inch of the tire. Air pressure

is expressed in pounds per square inch (psi) or

kilopascal (kPa).

Accessory Weight: This means the combined weight

of optional accessories. Some examples of optional

accessories are, automatic transmission, power steering,

power brakes, power windows, power seats, and air

conditioning.

Aspect Ratio: The relationship of a tire’s height to

its width.

5-50

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Chevrolet 2004 Epica Spezifikationen Seite 244