Centramatic Wheel Balancers
Centramatic Wheel Balancers     

Centramatic Wheel Balancers - Measuring Bolt Circles


What is a Bolt Circle?
The bolt circle is the pattern of the lug nut bolt holes on your wheel.

The bolt circle is measured from the positions of the holes from the middle of each bolt hole on the circumference of the bolt circle. The bolt pitch diameter is measured in inches or millimeters. For a 4 or 6-bolt wheel this is the distance between the center of two bolts that are directly opposite each other. To determine the center of a 5-bolt pattern multiply the center distance between any two adjacent holes by 1.701. For any wheel, you can calculate the bolt pitch diameter from the number of bolts and the measured center distance between two adjacent bolts.

How do I measure?
First count the number of Lug Nut "bolt holes", then, follow the chart below:
  • 4, 6, or 8-Lug: Measure between two lugs directly across the center, from the middle of one hole to the middle of the one directly across, bisecting the middle of the axle hole.
  • 5-Lug: Measure the distance from the center of the two holes next to each other and use this chart:
    • You have a 4.00" bolt circle if the distance is 2.35" between the holes
    • You have a 4.25" bolt circle if the distance is 2.50" between the holes
    • You have a 4.50" bolt circle if the distance is 2.65" between the holes
    • You have a 4.75" bolt circle if the distance is 2.79" between the holes
    • You have a 5.00" bolt circle if the distance is 2.94" between the holes
    • You have a 5.25" bolt circle if the distance is 3.09" between the holes
    • You have a 5.50" bolt circle if the distance is 3.23" between the holes

Centramatic Wheel Balancers     


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