Ever wondered how to work out pcd? well i have when buying alloys second hand from muppets who cant tell you any way this is what i stumbled across How to calculate the Pitch Circle Diameter (PCD) Measure the distance between the centres of two adjacent holes S and then complete the following equation. Due to the accuracy of measuring it may be necessary to round to the nearest available PDC measurement. EXAMPLE 0.7071 is the constant factor for four stud if S= 71mm PCD = 71 0.7071 = 100.41 = 100mm EXAMPLE 0.5878 is the five stud contant factor. if S= 97mm PCD = 97 0.5878 = 165.02 = 165.1mm S can be measured in metric or imperial. Imperial measurement must be a decimal. It may be easier to measure S in millimetres and try a conversion to imperial to see if you have a metric or imperial PCD. Imperial to Metric common PCD measurements: 4 = 101.6mm 5.5 = 139.7mm 6 = 152.4mm
Nice find! Tho only needed on 3, 5 or 6 stud wheels, on 4 stud you can just measure 2 bolts that are opposite to each other
