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Measure Your Trailer Wheel Bolt Pattern

HOW TO MEASURE YOUR TRAILER WHEEL BOLT PATTERN

If you're replacing your trailer wheel, you've no doubt realized you need to know something called the bolt pattern (also called the lug pattern or bolt circle).An 8-lug wheel needs to be replaced by another 8-lug wheel, but the number of bolt holes or lugs is only half the equation. The bolt pattern of a wheel is defined by two numbers: the number of bolt holes and the diameter of the circle (in inches) they form. Measuring for your pattern is pretty simple, but to make things even easier, you can use a bolt pattern template or print one.If you'd rather measure it yourself, however, it's pretty simple to do. Below, we'll show you how to measure a bolt circle to determine the correct wheel bolt pattern of your trailer wheel.
Watch Now: How to Measure Your Trailer Wheel Bolt Pattern
Determining Your Trailer Wheel Bolt Pattern

Determining Your Trailer Wheel Bolt Pattern

The first step in determining your wheel bolt pattern is counting how many bolts (or lugs) your wheel has. Typically this will be 4, 5, 6, or 8. Next, you'll measure how many inches apart the bolt holes are. These two steps together will give you your bolt hole pattern. For example, if you have a wheel with 5 bolt holes and they form a circle with a 5-1/2" diameter, you have a wheel with a 5 on 5-1/2 bolt pattern.So how exactly do you measure between the bolt holes? The process differs a little depending on if your wheel has an even or odd number of holes. We'll go over the process for each below.

Bolt Patterns for Wheels with Even Bolt Holes

(4, 6, or 8 Holes)To measure between the holes on a wheel with an even number of holes, simply measure from the center of one bolt hole to the center of its opposite to determine the diameter of the lug pattern.
Bolt Patterns for Wheels with 4 Bolt Holes
Bolt Hole Pattern - 4 Lugs
Common bolt patterns for wheels with 4 bolt holes are:
Bolt Patterns for Wheels with 6 Bolt Holes
Bolt Hole Pattern - 6 Lugs
Common bolt patterns for wheels with 6 bolt holes are:
Bolt Patterns for Wheels with 8 Bolt Holes
Bolt Hole Pattern - 8 Lugs
Common bolt patterns for wheels with 8 bolt holes are:

Bolt Patterns for Wheels with Odd Bolt Holes

(5 Holes)Measuring the diameter of a bolt circle with an odd number of lugs isn't as straightforward. You can't measure straight across because there is no opposite bolt hole. However, there a few ways to get around this and figure out the bolt pattern you need for your new wheel.
Option 1 - Measure from Center to EdgeAn 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 of the two farthest holes.
5 Lug Pattern Trailer Wheel
Option 2 - Measure to Imaginary Bolt Hole CenterMeasure from the center of one bolt hole to a point on the rim where the bolt hole would be on an odd-lug wheel. You must guess where this point is located if you want to measure the diameter this way.
5 Lug Pattern Trailer Wheel
Option 3 - Measure Adjacent HolesYou can also measure the center-to-center distance of adjacent holes. Then, compare the distance to those in the list below to find the circle diameter.
If the distance is:2-5/8" - bolt pattern is 5 on 4-1/22-3/4" - the bolt pattern is 5 on 4-3/43" - the bolt pattern is 5 on 53-1/4" - the bolt pattern is 5 on 5-1/2
5 Lug Pattern Trailer Wheel
Still have questions?Give our experts a call at 800-298-8924, or contact us online. We're happy to assist any way we can!Related ArticlesRelated ProductsUpdated by: Amber S.Updated on: 2/18/20

Ben R.

9/11/2022

I have an old homemade trailer that i have not been able to find a spare rim for. The rim is 15 inches, 5 lug pattern. The distance from the lug holes next to each other, center to center is 3 1/2". The distance between lug holes across from each other, center to center is 4 3/4". The center hole is 3 1/2 wide. Does anyone know what vehicle this came from? I was told it was built on an older Chevy or Ford frame but have not been able to confirm that.

Etrailer Expert

David B.

9/12/2022

Ben, the closest thing I have to that is this # TTW550547WS1 . You can see its full specs on the product page. If this doesn't work you will probably have to get new spindles or in all honesty get a new axle with spindles/hubs included. That may be the easiest route and possibly cheaper.

Alex K.

11/14/2022

@BenR Same thing happened to me. I bought a homemade trailer that ended up having an old ford axle on it. After some measuring, I found out it was a 15x6 rim with a 5x5.5 bolt pattern (Or 5x139.7mm). Most replacement steel wheels have been discontinued and I had a hard time finding a spare rim (Ended up finding one today). My advice is to call wheel and tire shops, junkyards/salvage yards, or a classic car shop. Measure from the center of one hole to the farther edge of another hole (Measure the hole across, not side to side). Hope this helps. I think the old chevy pattern is 5x5 (5x127)

David G.

3/25/2022

Very good! But I still measure 6 on 6 bolt pattern. Is that possible?

Les D.

3/28/2022

@DavidG most 6 lug tires, have lugs that are 5-1/2 inches apart. I would remeasure making sure to measure from the center of the lug holes. We do not carry any 6 on 6 inch patterned wheels.

Bob H.

3/6/2022

I bought a German trailer that has 13" wheels with a 4 X 100mm bolt pattern. Will a 4 inch bolt pattern work on this (101.8mm)?

Les D.

3/7/2022

BobH they need to be exact size to work. Replacing all axles, wheels, bearing, etc would likely be more costly than just buying another trailer.

Angela B.

1/18/2022

For someone like me that doesn't know anything about trailers the etrailer experts know their stuff.

Glenn D.

12/24/2021

yes, I too have an old homemade trailer, hand me down. it has 5 lugs 3inches apart and 5 inches from center to center with a 4-inch hub opening. 15-inch tire.is there any rim available to fit my old homemade trailer?

Les D.

12/27/2021

@GlennD if your wheel has 5 lugs, and the distance from the center of one lug hole to the center of the next lug hole is 3 inches, then your lug pattern is 5-ON-5. I have included a link to all of our 5-ON-5 wheels, plus wheels with tires. However, these all have pilot holes that are sized 3.19 or 3.31 inches. I would double check your measurements. Many customers find it easier to use the print out template. I have included a link to it below.


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