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Message: <blockquote data-quote="FABRICATOR" data-source="post: 42672" data-attributes="member: 80">Wheel terminology (from a manufacturer, edited)Backside setting/Back spacing - The measurement from the mounting pad to the inner edge of the wheel. 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. Center Bore - The hole in the center of the wheel machined to match the hub of specified vehicles with hub-centric wheels and machined to a generic size with lug centric wheels. Hub centric - The center bore hole of a wheel matches the hub diameter of the vehicle. This centers the wheel via the center hole rather than the lug nuts. Load rating - The maximum weight that the wheel is designed to support. To determine load rating requirements take the gross axle weight rating and divide by 2. 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 should be balanced from the bolt holes. Mounting pad - The surface area on the back of the wheel's center that contacts the brake drum or rotor surface. Negative offset - When the mounting surface is closer to the disk/drum (Inside) of the wheel. Or the mounting pad is behind the centerline of the wheel. This type of wheel is commonly referred to as a deep-dish wheel. This offset is common in older vehicles and will bring the wheel/tire combination out away from the vehicle. Offset - The offset of the wheel is the distance from the mounting pad to the centerline of the wheel. Positive offset - The mounting pad is forward of the centerline of the wheel, towards the street side of the wheel. This is common in most front wheel drive cars and some newer trucks. Generally speaking a positive offset wheel brings the wheels closer to the center of the vehicle. 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. Zero offset - The distance from the mounting pad to the centerline of the wheel is 0.The best ideas are the ones that look obvious to the casual observer.</blockquote>

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