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T & RA
|
Tire
and Rim Association |
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T-Rated
|
A
speed rating category for vehicles with a top speed up to
118 m.p.h.
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Tensile Strength |
The
maximum tensile force per cross-section area that a material
can withstand before it breaks.
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Three-Piece Wheel
|
A
specialty wheel composed of two outer rim halves, usually
made of aluminum alloy, and a center section of
pressure-cast aluminum or magnesium alloy. The center is
either bolted or riveted to the rim.
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Tie Roads
|
Devices that join the center link of a steering system to
the steering arms that connect to the wheels.
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Tire Mixing
|
The
installation of tires of different sizes and/or construction
on a vehicle; a condition generally to be avoided. However,
certain manufacturers do recommend different tire sizes on
the front and rear positions. Manufacturer's specifications
should always be checked.
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Toe
|
The
difference in distance between the front and the rear of a
pair of tires mounted on a common axle.
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Toe-In
|
A
condition where the fronts of two tires on the same axle are
closer together than at the rear. |
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Toe-Out
|
A
condition where the fronts of two tires on the same axle are
farther apart than at the rear.
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Toe-Out-Turns
(Ackerman
Angle)
|
The
difference between the turning angle of the inside wheel and
the outside wheel during a turn to the left or right;
toe-out turns is not adjustable and is designed into the
steering linkage system by the manufacturer. |
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Torque
|
The
product of a force applied through a lever arm to produce a
rotating or turning motion. |
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Torque
|
The
product of a force applied through a lever arm to produce a
rotating or turning motion. |
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Torque-Rating
|
The
proper torque, expressed in foot-pounds, for tightening lug
nuts of various diameters. |
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Torquing
|
The
securing of the tire/wheel assembly to the vehicle by the
tightening of the wheel's lug nuts to the studs of the
vehicle's hub; in the case of specialty wheels, torquing
should always be done with a manual torque wrench,
containing an insert socket of plastic or Teflon.
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Torsion Bar
|
A
"straight" spring that twists under loads; the natural
resistance to this twisting provides the spring action.
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TPC
|
A
Tire Performance Criteria marking, appearing on radial
tires, which denotes that a tire meets performance
specifications set by General Motors, for original equipment
use.
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Trac·Point
|
Bridgestone's sipe design.
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Track
|
The
distance between the front tires on the front axle and the
rear tires on the rear axle.
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Tracking
|
The
difference in distance between each of the rear wheels and
the centerline of the vehicle.
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Trailing Arm
|
A
rear suspension system consisting of an arm whose pivot axis
is exactly across the vehicle or perpendicular to the
direction of travel.
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Tread
|
The
portion of a tire which contacts the road surface.
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Tread Buffing
|
A
process in which a portion of the tire tread is removed by
buffing or grinding it down; similar to tread shaving.
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Tread Depth
|
The
distance from the tread surface to the bottom of the
grooves.
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Tread Life
|
Length of service in miles before the tread wears out.
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Tread Radius
|
The
radius of curvature of the tread arc across the tread.
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Tread Shaving
|
The
shaving of tread from a tire with a blade (usually to half
of original tread depth) to reduce tread squirm and tearing
in racing applications.
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Tread Wear Indicators
|
A
raised area in the tread grooves which becomes even with the
tread surface when the tire is worn to 2/32" tread depth;
used to define the legal wear-out point in a tire's life.
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Tread Width
|
The
tread width is the distance from outer edge to outer edge of
the tread.
e |
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Two-Piece Wheel
|
A
specialty wheel comprising a center section of aluminum or
steel that is fastened to an aluminum or steel rim. |