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Tire Terminology...
| 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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