What does PCD mean?
The Pitch Circle Diameter (PCD) is the diameter of the circle which passes through the centre of all the studs, wheel bolts or wheel rim holes.
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The easiest way calculate the PCD is as follows:
1) Measure the distance ‘S’ between two adjacent studs from the centre of each hole.
2) Calculate from the formula below
**Note: on 4 lug fitments you can measure from the center of one stud to the center of the stud directly opposite.
PCD Calculation Formula
4 Stud PCD = S / 0.7071
5 Stud PCD = S / 0.5878
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6 Stud PCD = S / 0.5
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–Courtesy of YHI