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U-Rated |
A
speed category for a vehicle of a top speed up to 124 mph.
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Under inflation
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A
condition where a tire is inflated below recommended
pressure.
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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.
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Under tread |
The
portion of the tread compound between the bottom of the
tread grooves and the top of the uppermost ply belt.
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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. |
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Uniformity |
A
term describing the amount of radial and lateral force
variation in a tire.
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Un-sprung Weight
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The
total weight of a vehicle not supported by the suspension
system; tires and wheels, for example.
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Upper Sidewal |
The
part of a tire's sidewall nearest the tread shoulder.
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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.
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V |
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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.
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Variable Integrated Pitch
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Variations in angles and sizes of a tire's tread elements
that reduce ride noise levels.
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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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