Bolt Circle / Stud Pattern (PCD)

Sometimes referred to as bolt pattern or PCD: the number of stud holes on the diameter of the imaginary circle that each stud hole is centred on
Example: 5-4.75 PCD would be a 5 stud wheel and the measurement as in the diagram below for 5 stud would measure 4 3/4" or 120.65mm

5 Stud: Measure from back of the hole to the centre of the second.
4 stud: Measure from the two hole directly across from each other from center to center of the hole.
6 Stud & 8 stud: measure same as 4 stud.

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