Stud Patterns

Bolt pattern or Pitch Circle Diameter (PCD) is the diameter of an imaginary circle formed by the centers of the wheel lugs. Bolt patterns can be 4-, 5-, 6-, or 8-lug holes. A bolt circle of 4×100 would indicate a 4-lug pattern on a circle with a diameter of 100mm. The diagram (upper, left) indicates the proper measuring methods.