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Aspect Ratio
The height of a tire, from bead to tread, expressed as a percentage of the tire's section width.Ex. 65 in P215/ 65 R 89H indicates the aspect ratio. TERM 2
Bead
DEFINITION 2 The edge of a tire's sidewall, usually made of steel wires wrapped in rubber, used to hold the tire to the wheel. TERM 3
Tread
DEFINITION 3 The area of a tire that designed to make contact with the road. TERM 4
Plies
DEFINITION 4 The reinforcing members of a tire composed of layers of cord fabric and rubber that provide the strength to contain the air pressure needed to support a load and resist deflection. TERM 5
Radial Ply
DEFINITION 5 Tire construction in which the cords in the body plies of the carcass run at an angle of 90 degrees to the steel beads in the inner rim of the carcass. Each cord is parallel to the radius of the tire circle.
Radial Runout
An out-of-round condition in which the radius of the wheel or tire is not consistent from the wheel center to any point on the rim or the tread. TERM 7
Lateral Runout
DEFINITION 7 A side-to-side variation, or wobble, as something is rotated. TERM 8
Hub
DEFINITION 8 The inner component of a multi disc clutch that is splined with the friction discs of the clutch and a component of the planetary gearset. When the clutch is applied, the hub will drive, rotate or hold a planetary gearset component. TERM 9
Dynamic Balance
DEFINITION 9 The balance of an object when it is in motion; for example, the dynamic balance of a rotating driveshaft. TERM 10
Static Balance
DEFINITION 10 Balance at rest; still balance. It is equal distribution of weight of the wheel and tire around the axis of rotation such that the wheel assembly has no tendency to rotate by itself regardless of its position.
Tire Rotation (front-to-rear)
Front-to-rear pattern may be used for vehicles equipped with the same-store directional wheels and/or tires. TERM 17
Tire Rotation (side-to-side)
DEFINITION 17 Side-to-side pattern may be used for vehicles equipped with different-sized nondirectional tires and wheels on the front axle compared to the rear axle. TERM 18
Tire Rotation (Forward
Cross)
DEFINITION 18 On FWD cars with a full-size matching
