# What Is Pitch Circle Diameter?

**What Is Pitch Circle Diameter?**

Another wheel measurement thatâ€™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.** **

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.