How to Measure the Bolt Pattern of a Trailer Wheel


What is the bolt pattern?

Measuring wheel bolt hole pattern illustration

The bolt pattern of a wheel is defined by two numbers: the number of bolt holes and the diameter of the circle (in inches) that they form, measured through the centers of the bolt holes. For example, a 5 on 5-1/2 bolt pattern defines a wheel that has 5 bolt holes spaced out evenly along a circle that has a 5-1/2" diameter. Learn how to measure for bolt hole pattern and see all of the most common bolt patterns found on wheels, below.




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How to Determine the Bolt Pattern of a Trailer Wheel


measure bolt pattern across the circle






Most Common Bolt Hole Patterns

Learn how to measure bolt hole patterns on trailer wheels in the sections below. Each section shows how to determine the pattern of a wheel with a specific number of bolt holes.


Bolt Patterns for Wheels with Four Bolt Holes

Measure from the center of one bolt hole to the center of its opposite to determine the diameter of the lug pattern on wheels with four bolt holes.


Common bolt patterns for wheels with four bolt holes are:

4 on 4 trailer wheel




Bolt Patterns for Wheels with Five Bolt Holes

The diameter of the circle formed by the bolt holes is not easy to measure on wheels that have 5 lugs. You can't measure from the center of one bolt hole to the center of its opposite because there is no opposite bolt hole. You have to guess where that opposite bolt hole would be. However, there are easy, alternative ways to measure the diameter of these wheels.


Bolt Hole Diameter

This illustration shows where the diameter of the bolt hole circle is measured on wheels that have 5 bolt holes. Notice that the measurement is from the center of one bolt hole to a point on the rim where there is no bolt hole. You must guess where this point is located if you want to measure the diameter this way. The next section shows other, easier ways to find the diameter.


Common bolt patterns for wheels with five bolt holes are:

5 on 4-1/2 trailer wheel


Alternative Methods for Measuring Bolt Hole Patterns

Consider these alternative methods to determine the diameter of the circle formed by the bolt holes of a 5 bolt hole wheel.


Alternative Method #1

An easy way to determine bolt hole circle diameter on wheels with 5 bolt holes is to measure from the center of one bolt hole to the farthest edge of one on the two farthest holes.


Common bolt patterns for wheels with 5 bolt holes are:

Measure bolt hole pattern on trailer wheel with 5 bolt holes

Measure from center of one hole to the outer edge of the other





Alternative Method #2

Another way to determine bolt hole circle diameter on wheels with 5 bolt holes is to measure center-to-center of adjacent holes and then compare the distance to those in the list below to find the circle diameter.


If the distance is:

Measure bolt hole pattern on trailer wheel with 5 bolt holes

Measure center-to-center between adjacent bolt holes





Bolt Patterns for Wheels with Six Bolt Holes

Measure from the center of one bolt hole to the center of its opposite to determine the diameter of the lug pattern on wheels with six bolt holes.


Common bolt patterns for wheels with six bolt holes are:

6 on 5-1/2 trailer wheel




Bolt Patterns for Wheels with Eight Bolt Holes

Measure from the center of one bolt hole to the center of its opposite to determine the diameter of the lug pattern on wheels with eight bolt holes.


Common bolt patterns for wheels with eight bolt holes are:

8 on 6-1/2 trailer wheel




Shop for Different Styles of Trailer Wheels

After you have determined the bolt hole pattern of your trailer wheels, you can shop for wheels and tire/wheel combinations. You can choose from our large selection of trailer wheels, including conventional, modular, spoked, and more.



These wheels are the basic, old-style automobile wheels, available in white and black. A raised lip or ridge provides an attachment point for older-style hubcaps. The 8 on 6-1/2 bolt pattern conventional wheel is often mounted to older pickup trucks and outfitted with baby moon hubcaps, available here at etrailer.com.

Baby moon hubcap Shop for Hubcaps




Steel Spoke Wheels


This design is a favorite. These spoke wheels come in powder coated steel and galvanized finishes.




Aluminum Spoke Wheels


These polished, clear-coated wheels can give your trailer an attractive, custom look.





These trailer wheels have a solid center, a design that gives the wheel maximum strength.





Replace the modular wheels on your trailer or upgrade to custom-look, show-quality polished aluminum wheels. Our modular wheels are available in polished aluminum, galvanized steel, or painted steel models.





These wheels feature a design in which each spoke is divided into two parallel spokes for a custom, sporty look.





These wheels are made with a sweptback design that gives a unique, custom look to your trailer.




Aluminum Wheels


Aluminum wheels combine an upgraded appearance over standard wheels and superior corrosion resistance.




Galvanized Wheels


Galvanized wheels provide strong corrosion resistance at an attractive price.






Related Products




Additional Articles


How to Measure a Trailer Tire


How to Determine Diameter of Tires and Wheels


Specifications for Most Tire Sizes


Answers to Common Tire Questions


Written by: Raymond P.

Last updated: 12/5/17







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