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{ Useful Info.
Tire Terminology:
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Off-The Car Balancing
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A procedure in which a tire and wheel assembly is balanced by a bubble or computerized electronic balancer while the assembly is off the vehicle; computerized electronic balancers are the best way to accurately measure dynamic balance. |
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Offset
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The distance from the centerline of the wheel to the mounting face of the wheel. |
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One-Piece-Wheel
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Used to describe an aluminum specialty wheel that is cast in one piece; also the standard wheel found as OEM on production cars. (OEM wheels are typically two piece.) |
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Original Equipment (O.E.)
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Refers to tires sold to automobile manufacturers for equipping their new cars. |
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Out-of-Round
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A wheel or tire defect in which the wheel or tire is not round. |
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Overall Diameter
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The maximum height of a tire when mounted on a wheel and inflated to rated pressure. |
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Over inflation
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The inflation of a tire above recommended pressure to achieve improved performance; negative byproducts are rough ride, bruise damage, and suspension system strain. |
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Over steer
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A cornering condition where rear tires operate at a greater slip angle than the front tires; the tendency of a car to turn more sharply than the driver intends while negotiating a turn. |
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Oxidation
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Reaction of a material with oxygen, usually resulting in degradation of the material. |
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P-Metric System
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A tire sizing system using the section width in millimeters, aspect ratio, type of tire construction, and rim diameter in inches (e.g.: P225/70R15). |
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Pitch
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The length from a point on one tread block to the same point on the next tread block. Pitch is varied around a tire to minimize noise. |
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Pitman Arm
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A rubber compound chemical; used to make or keep rubber soft and flexible. |
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Plies
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The layers of fabric that make up the cord body of a tire. |
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Plowing
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The loss of cornering capability of the font of the vehicle. The car tends to go straight. |
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Plus 1/Plus 2 Concept
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A concept to improve handling and performance through the mounting of tires with wider section widths and lower section heights to rims of 1,2 and sometimes even 3 inches greater diameter. |
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Polyester
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A strong and lightweight synthetic cord material used in casing construction. |
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Polymer
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A chemical compound made up of a large number of identical components linked together like a chain. |
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Positive Camber
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A condition where the top of a tire is leaning outward from the tire's vertical centerline, as viewed from the top. |
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Positive Caster
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A setting where the steering axis is inclined rearward at the top, as viewed from the side; makes possible the self-centering force that tends to return the wheel to the direction the vehicle is traveling. |
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Positive Offset
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When the back of the bolt pad is closer to the street side of the wheel; when the mounting face is outboard of the rim centerline, draws assembly towards the vehicle resulting in narrower tracking. |
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PSI
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Pounds per square inch. |
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Pull
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The tendency of a vehicle to veer to one side. |
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Pyramid Belt
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A belt design in which the upper layer is narrower than the lower layer. |
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Pyrometer
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A thermocouple device used for measuring tread temperatures in tires. |
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