Douglas Wheel halves come in two different shapes, commonly referred to as a "BELL" and a "NOSE".

The BELL shape creates the maximum amount of clearance inside the wheel for brake and steering parts.

The NOSE shape has a smaller drop center for ease of tire mounting.

Each completed wheel must contain at least 1 NOSE half for ease of tire mounting.

 

Following each part number will be a description of the wheel that might look like this:

8x8 3B+5N 4/110.125 10MM

8x8 3B+5N 4/110.125 10MM. The first 8 refers to the wheel diameter, measured from the tire bead seat.

8x8 3B+5N 4/110.125 10MM. The second 8 refers to the wheel width, measured from the inside bead to the inside bead.

8x8 3B+5N 4/110.125 10MM. The 3B refers to the width of the inside half of the wheel, in this case a BELL shape.

8x8 3B+5N 4/110.125 10MM. The 5N refers to the width of the outside half of the wheel, in this case in a nose shape.

8x8 3B+5N 4/110.125 10MM. This 4/110 refers to the bolt pattern. It has 4 bolt holes, equally spread around a 110-millimeter diameter circle.

8x8 3B+5N 4/110.125 10MM. This .125 refers to the thickness of the material used in the wheels, in this case .125 inch thick.

8x8 3B+5N 4/110.125 10MM. This 10MM refers to the size of the bolt hole, in this case 10 millimeters.

Other terms found in wheel descriptions will include IR for integral reinforcing rings, IB for integral beadlocks, BILLET for a billet center, BB for a conventional center, and S for bead retention screws.