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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

   
Backspacing The measurement from the back of the bolt pad to the back edge of the rim; used to calculate offset and determine where the back of the bolt pad is located in relation to the rim width, sometimes referred to as rear spacing.
Balance A uniform mass distribution of a tire and wheel assembly about its axis of rotation.
Bale Rubber The form in which solid rubber is shipped to tire manufacturers.
Ball Joint A ball-and-socket connection that lets a steering knuckle move in several directions at the same time.
Bead The area of the mounted tire which seats against the wheel.
Bead Filler A rubber extrusion in the bead area of a tire; used to permit a smooth contour of casing plies around the bead and to the lower sidewall. Also used in enlarged form to stiffen the lower sidewall of a tire.
Bead Seat The position where the tire rests and seals on the inside of the rim.
Belt An assembly of fabrics and/or wire used to reinforce a tire's tread area. In radial tires, it also constrains the outside diameter against inflation pressure and centrifugal force.
Belt Edge Wedge or Insert An extrusion of rubber placed under the edges of a belt; used in radial tires to improve durability.
Belted Bias Tire A bias tire with additional reinforcing belt's between the casing plies and the tread.
Bias Tire A tire built with two or more casing plies which cross each other in the crown at an angle of 30 or 45 degrees to the tread centerline.
Bladder A rubber bag used inside a tire during the molding and curing process; contains hot water steam which presses the inside of the tire into the mold.
Blemish Tire A tire with a cosmetic or minor uniformity imperfection but whose safety and performance are unaffected.
Block Part of a tire tread pattern created by lateral (side-to-side) grooves.
Body Tire structure except for tread and sidewall rubber.
Bolt Circle Often referred to as the bolt pattern; the diameter of an imaginary circle drawn through the center of each lug hole.
Braking Torque Torque applied by a brake to a tire/wheel assembly which slows or stops the vehicle.
Breakaway The point at which tire cornering traction is lost.
Bump Steer A steering effect resulting from toe or camber changes as the suspension moves up and down.
 

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