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Accessory weight: The combined weight (in excess of those items replaced) of items available as factory installed equipment.

Bead: The inner edge of a tire that is shaped to fit to the rim and form an airtight seal. The bead is constructed of steel wires which are wrapped, or reinforced, by the ply cords.

Cold tire pressure: The air pressure in a tire which has been standing in excess of 3 hours, or driven for less than 1 mile.

Curb weight: The weight of a standard vehicle, including a full tank of fuel, any optional equipment fitted, and with the correct coolant and oil levels.

Gross Vehicle Weight (GVW): The maximum permissible weight of a vehicle with the driver, passengers, load, luggage, and equipment.

kPa: Kilo Pascal, a metric unit of measure for pressure.

lbf/inĀ² or psi: Pounds per square inch, an imperial unit of measure for pressure.

Maximum inflation pressure: The maximum pressure to which the tire should be inflated. This pressure is given on the tire sidewall in lbf/in2 (psi) and kPa.


This pressure is the maximum allowed by the tire manufacturer. It is not the pressure recommended for use.

Maximum loaded vehicle weight: The sum of curb weight, accessory weight, vehicle capacity weight, plus any production option weights.

Production options weight: The combined weight of options installed which weigh in excess of 3 lb (1.4 kg) more than the standard items that they replaced, and are not already considered in the curb or accessory weights. Items such as heavy duty brakes, high capacity battery, special trim, etc.

Rim: The metal support for a tire, or tire and tube, upon which the tire beads are seated.

Vehicle capacity weight: The number of seats multiplied by 150 lb (68 kg), plus the rated amount of load/luggage.