How To Measure PCD

 

 

If the wheel rim size is either 8″  or 10″  and has a notch /cut out in the large centre hole as shown in the diagram below ”  it will almost certainly have a PCD of 4″ (101.6mm) The stud size for this PCD is 3/8 unf

4 HOLE WHEELS
Measure the distance between the centres of 2 OPPOSITE holes
OR
Measure the distance between the centres of 2 ADJACENT holes and multiply by 1.414
5 HOLE WHEELS
Measure the distance X between the centres of 2 ADJACENT holes and multiply by 1.7012