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Tire Terminology:

A B C D E F G H I K L M N O P R S T U V W Z

   
U-Rated A speed category for a vehicle of a top speed up to 124 mph.
Under inflation A condition where a tire is inflated below recommended pressure.
Under steer A cornering situation where the front tires generate more sip angle than the rear tires; the tendency of a car to turn less sharply than the driver intends and compensated for by the addition of more steering input.
Under tread The portion of the tread compound between the bottom of the tread grooves and the top of the uppermost ply belt.
Undulation A slight indentation or wavy appearance on the sidewall surface of an inflated radial tire. Radial body ply cords run straight across the tire from bead to bead and the joining of the ply material in the sidewall area may sometimes cause this condition. Undulating is a common characteristic of radial tires and will not effect the performance of the tire.
Uniformity A term describing the amount of radial and lateral force variation in a tire.
Un-sprung Weight The total weight of a vehicle not supported by the suspension system; tires and wheels, for example.
Upper Sidewal The part of a tire's sidewall nearest the tread shoulder.
UTQG Uniform Tire Quality Grade; a performance measurement of a tire, based upon its test results in three categories: tread wear, traction, and temperature resistance.
  V
V-Rated A speed category for vehicles with a top speed of more than 130 mph. Load index V-speed rated capped at 149 mph.
Variable Integrated Pitch Variations in angles and sizes of a tire's tread elements that reduce ride noise levels.
Vulcanization The linking together, under heat and pressure, of rubber compound polymers which changes material from a sticky, putty-like substance to an elastic, bouncy substance.
 

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