Technical Dictionary

Plus-sizing

An option allowing drivers to customize their vehicles by mounting low-profile tyres on wider rims (one or two inches greater in diameter), usually enhancing vehicle appearance, handling, and performance.

P-metric

Uniform designation of tyre sizes, in metric measurements originally introduced by American tyre manufacturers in 1977; commonly called P-metric series. A typical P-metric tyre is P205/70R14 93S.

Positive camber

Alignment angle that makes the top of the tyres farther apart than at the bottom; tyres are tilted out from the centerline of the vehicle.

Positive caster

Alignment setting when the steering axis is inclined rearward at the top.

Pull

A condition in which a vehicle swerves to one side without being steered in that direction, as a result of irregular tyre wear, improper front and/or rear wheel alignment, or worn or improperly adjusted brakes.

Pneumatic tyre

A tyre designed to be filled with air.

PAX System™

Michelin® PAX™ System is a new run-flat technology that combines a unique tyre, wheel, support ring, tyre pressure monitoring system, and specially formulated gel to enable continued mobility after a sudden loss of inflation pressure. The system is designed for operation at 55mph for a range up to 125 miles. When in normal (inflated) operation, Michelin® PAX™ System tyres enhance road handling and driving comfort, plus reduce rolling resistance.

Ply

A rubber-coated layer of fabric containing cords that run parallel to each other and make up the structure of a tyre. Layers of this material are called plies, and they extend from bead to bead, between the inner liner, and belts or tread. Plies are usually reinforced with either textile or steel cords.

Positive offset

The mounting face of a wheel is toward the wheel’s street side, moving the tyre and wheel assembly in toward the vehicle.

PSI

Abbreviation for pounds per square inch.

Proprietary Blended Compounding

Technology that creates a uniform compound blend that helps provide outstanding all-around performance in wet and dry conditions.