Pilot: Nominal diameter of center hole that
fits over the hub or axle.
Rim Diameter: Nominal Diameter measured from
Non-Reversible: Wheel will mount on one side of
disk face only.
Chamfer: Breaks the sharp edges of mounting
holes to assist in assembly.
Rim Width: Nominal width measured between rim
Bead Seat: Position where tire rests on rim and
Centerline: 1/2 of rim width.
Click here for visual description of
Bolt Circle (Pattern): The diameter of an
imaginary circle drawn through the center of each lug hole or stud.
Illustration on right.