Dub (wheel)

The wheel size for a motor vehicle or similar wheel has a number of parameters.

The bolt pattern determines the number and position of the mounting holes to allow the wheel to be bolted to the hub. As the bolts are evenly spaced, the number of bolts determines the pattern. For example: smaller cars have three (Citroën 2CV, Renault 4, some Peugeot 106s and Citroën Saxos). Compact cars may have four bolts. Most United States passenger cars have five bolts. Pickup trucks, large SUVs, and armored vehicles may have as many as five, six, eight, or ten. It is not unheard of to find vehicles with even more, such as enormous coal mining transporters that may have twelve.

The is the notional circle determined by the positions of the bolts. The center of every bolt lies on the circumference of the bolt circle. The important measurement is the bolt circle diameter (BCD), also called the pitch circle diameter (PCD).

The BCD may be expressed in millimeters or inches, and is usually given with the number of bolts. For example, a 1974 MG B has a 4/4.5 inch (4/114.3 mm) wheel hub, meaning it has a 4-bolt pattern with a 4.5 inch (114.3 mm) bolt circle diameter.

The most common BCD values are 100 mm (≈3.94 inches), 112mm (4.41inches) and 4.5 inches (114.3 mm). Many old British cars use 4 x 4"

Wheels must be fitted with the correct type of lug nuts on wheel studs, or bolts. Lug nuts (aka wheel nuts in British English) are usually either flat, tapered (generally at 60 degrees and referred to as conical seat), or ball seats, meaning the mounting surfaces are flat, tapered, or spherical respectively. Most Mercedes have ball lug seats from the factory while most aftermarket wheels have a tapered lug design. Wrong lug nuts for the wheel will not properly center it and cause wobble. Some manufacturers (e.g. Toyota and Lexus) have used taper lug nuts for steel wheels and flat seated lug nuts for alloy wheels.

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Wikipedia