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Performance & Hotrod Business - April '15

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April 2015 n Performance & Hotrod Business n 55 Glossary Backside Setting/Backspacing: The measurement from the mounting pad to the inner edge of the wheel. Lay a straight edge across the entire back of the wheel and mea- sure directly to the mounting pad surface. Bead Seat: The position where the tire rests and seals on the inside of the rim. Bolt Circle: The diameter of an imaginary circle drawn through the center of each lug hole. Also referred to as the bolt pattern. 4- and 6-lug patterns are easily measured, 5-lugs require a little thinking, where you measure from the center of one stud, skip a stud, and measure to the far edge of the third stud. Center Bore: The hole in the center of the wheel machined to clear the hub of specified vehicles. Lug Centric: When the wheel is centered by the bolt holes/lug nuts of the wheel, rather than by the center bore. Lug centric wheels are most common to this segment and should be balanced from the bolt holes using the proper adapter. Mounting Pad: The surface area on the back of the wheel's center that contacts the brake drum or rotor surface. Rim Width: The width of the custom wheel, measured from bead seat to bead seat (not edge to edge). Rim Diameter: The overall diameter of the wheel's bead seat, not the diameter of the rim edge. Rim Flange: The outermost edge of the wheel's rim that the clip-on weights attach to on most wheels. Safety Bead: The raised area circling the rim of the wheel and located slightly inward from the bead seat. A require- ment for tubeless tires. Spring Clips: Push-on retainer clips that hold the brake drum to the axle on the assembly line; unnecessary at any other time. Torqueing: The securing of the wheel/tire assembly to the automobile by the tightening of the wheel's lug nuts to the studs of the vehicle's hub. Custom wheels should always be torqued with a manual torque wrench (not an impact air wrench) to torque rating specifications followed by periodic re-torqueing. Wheel Weights: Weights that are used to balance the wheel/tire assembly. They are either clipped, taped, or self- adhered to the inside or outside of the wheel. (Photo courtesy Coker Tire) Blair-708-qtr-HRR.indd 1 1/3/14 2:17:14 PM

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