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How to Determine the Bolt Pattern of a Trailer Wheel

Question:

What is the Bolt Circle Pattern for the wheels on a Dexter Axle P-18. I find it hard to measure since the 4.5 and the 4.75 is pretty close. I need to order two new rims and tires, but Im not sure if the bolt pattern is 4.5 or 4.75.

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Expert Reply:

One method you can employ to help figure out the bolt pattern is as follows: Use the distance between the center of one bolt hole to the center of the bolt hole adjacent to it:

If the distance is:
2-5/8 inches - the bolt pattern is 5 on 4-1/2
2-3/4 inches - the bolt pattern is 5 on 4-3/4

There could be different hubs put on a given axle with different bolt patterns so measuring is going to be key. The more common size is 5 on 4-1/2. This pattern can be found on everything for8 inch to 15 inch wheels. A 5 on 4-3/4 is typically limited to a 15 inch wheel.

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