What is a wheels PCD
A wheels PCD which stands for pitch cross diameter is the pattern of the studs and broken down into two numbers.
The first number, usually 3,4 or 5 is the number of bolts or studs the car has.
The second number is the diameter of an imaginary circle the bolts holes or studs are spread over.
For example a car with the PCD of 4*100 would have 4 bolt holes or studs spread over an imaginary circle of 100mm.