What Is Pitch Circle Diameter?

What Is Pitch Circle Diameter?


 Another wheel measurement that’s sometimes used is pitch circle diameter (PCD). This is the diameter of an imaginary circle that passes through the center of all studs, lug bolts, or wheel rim holes. 


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Shown here are formulas for calculating the pitch circle diameter of 4-, 5-, and 6-hole wheels.


 Pitch circle diameter is calculated by taking a measurement between the center points of any two lug holes. Then, that measurement is divided by .7071 for a 4-stud wheel, by .5878 for a 5-stud wheel, or by .5 for a 6-stud wheel to arrive at the PCD.