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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

   
T & RA
Tire and Rim Association
T-Rated
A speed rating category for vehicles with a top speed up to 118 m.p.h.
Tensile Strength The maximum tensile force per cross-section area that a material can withstand before it breaks.
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.
Tie Roads
Devices that join the center link of a steering system to the steering arms that connect to the wheels.
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.
Toe
The difference in distance between the front and the rear of a pair of tires mounted on a common axle.
Toe-In
A condition where the fronts of two tires on the same axle are closer together than at the rear.
Toe-Out
A condition where the fronts of two tires on the same axle are farther apart than at the rear.
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.
Torque
The product of a force applied through a lever arm to produce a rotating or turning motion.
Torque
The product of a force applied through a lever arm to produce a rotating or turning motion.
Torque-Rating
The proper torque, expressed in foot-pounds, for tightening lug nuts of various diameters.
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.
Torsion Bar
A "straight" spring that twists under loads; the natural resistance to this twisting provides the spring action.
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.
Trac·Point
Bridgestone's sipe design.
Track
The distance between the front tires on the front axle and the rear tires on the rear axle.
Tracking
The difference in distance between each of the rear wheels and the centerline of the vehicle.
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.
Tread
The portion of a tire which contacts the road surface.
Tread Buffing
A process in which a portion of the tire tread is removed by buffing or grinding it down; similar to tread shaving.
Tread Depth
The distance from the tread surface to the bottom of the grooves.
Tread Life
Length of service in miles before the tread wears out.
Tread Radius
The radius of curvature of the tread arc across the tread.
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.
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.
Tread Width
The tread width is the distance from outer edge to outer edge of the tread. e
Two-Piece Wheel
A specialty wheel comprising a center section of aluminum or steel that is fastened to an aluminum or steel rim.
 

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