A "bolt pattern" is essentially the diameter of the "bolt circle". Basically, the bolt pattern of a wheel is the diameter of the circle that the bolt holes are drilled on.
If you were to draw a circle through all of the lug holes in your wheel, the diameter of that circle, is your bolt pattern.
Below we illustrate how to measure your wheels bolt pattern. This technique works for trailer wheels as well as automotive and truck wheels.
4-Bolt Trailer Wheels
Measure from the center of one lug hole -- to the center of the lug hole directly across from it.
5-Bolt Trailer Wheels
Measure a five bolt wheel from the OUTER EDGE of one lug hole -- to the CENTER of the lug hole most across from it.
6-Bolt Trailer Wheels
Measure a six bolt wheel from the CENTER of one bolt hole -- to the CENTER of the lug hole ACROSS from it.
8-Bolt Trailer Wheels
Measure an eight bolt wheel from the CENTER of one bolt hole -- to the CENTER of the lug hole ACROSS from it.
Want to print a bolt pattern template?