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How To Measure a Bolt Pattern

4-Lug Trailer Wheels

5-Lug Trailer Wheels

   

4bolt2.jpgMeasure from the center of one lug hole -- to the center of the lug hole directly across from it.

5bolt2.jpgMeasure a five bolt wheel from the OUTER EDGE of one lug hole -- to the CENTER of the lug hole most across from it.

 

 

6-Lug Trailer Wheels

8-Lug Trailer Wheels

 6bolt2.jpgMeasure a six bolt wheel from the CENTER of one bolt hole -- to the CENTER of the lug hole ACROSS from it.  8bolt2.jpgMeasure an eight bolt wheel from the CENTER of one bolt hole -- to the CENTER of the lug hole ACROSS from it.
   

Measuring 4-Bolt Trailer Wheels

Measure a four bolt wheel from the center of a bolt hole, skip one bolt hole and then the center of the next hole. Basically your ruler goes across the center of the wheel.
 
Measuring 5-Bolt Trailer Wheels
Measure a five bolt wheel from the edge of one bolt hole, skip one bolt hole and then the center of the next hole. In this case the ruler is not across the center of the wheel and you measure from the edge of one to the center of the other.

You can also determine your 5 bolt pattern by measuring the distance between the center of one bolt hole, to the center of the bolt hole next to it. 

    If you measure:
  • 2 5/8" - your bolt pattern is 5 on 4.5"
  • 2 3/4" - your bolt pattern is 5 on 4.75"
  • 3" - your bolt pattern is 5 on 5"
  • 3 1/4" - your bolt pattern is 5 on 5.5"
 

Measuring 6-Bolt Trailer Wheels

Measure a six bolt wheel from the center of the bolt hole, skip 2 bolt holes and then the center of the next hole. Your ruler goes across the center of the wheel.
 

Measuring 8-Bolt Trailer Wheels

Measure an eight bolt wheel from the center of a bolt hole, skip 3 bolt holes and then the center of the next hole. Your ruler goes across the center of the wheel.