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Alternate method of measuring a PCD
measuring the Pitch Circle Diameter (PCD) of a rim involves taking a few simple measurements. Here are the steps:
Determine the number of studs or bolt holes on the rim. This will typically be 4, 5, 6, or 8.
Measure the distance between the center of one stud or bolt hole to the center of the opposite stud or bolt hole. This is called the Stud or Bolt Hole Diameter (SBHD).
If the rim has an odd number of studs or bolt holes, measure the distance between the center of any stud or bolt hole to the midpoint between the two adjacent studs or bolt holes. This is called the Center Distance (CD).
If the rim has an even number of studs or bolt holes, measure the distance between the center of any two adjacent studs or bolt holes. This is called the Center-to-Center Distance (CCD).
Calculate the PCD by using one of the following formulas:
For an even number of studs/bolts: PCD = (CCD x 1.414)
For an odd number of studs/bolts: PCD = (CD x 2)
Check your measurements to ensure accuracy and precision.
It's important to note that the PCD is typically measured in millimeters, so you may need to convert your measurements from inches to millimeters before calculating the PCD.