what does pcd mean for car wheels or tyres?

Q:

A: PCD stands for pitch circle diameter and is the diameter of a circle drawn through the centre of your wheel's bolt holes. P.C.D. is measured in millimeters and also indicate the number of studs or bolts the wheel will have. Volkswagen Alloy Wheels are usually either 4x100: i.e. 4 bolt holes drilled through the centre of an imaginary 100mm circle, or 5x100: for VR6s, GTis and MK4s http://ezinearticles.com/?Alloy-Wheels-Offset,-PCD,-Plus-Sizing-and-Up-Stepping&id=172078

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