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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 c …