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Lug bolt pattern

G

GentleBen

Member
Hi, how do you determine what the lug bolt pattern on a tractor or auto wheel is ? I see some listed as 5-4 3/4 or 5-4 1/4 How do I measure lug bolt pattern ? Thank You...Ben
 

I believe you measure from the center of one hole to the center of an adjacent hole, 4 1/4 in one example you gave. The 5 is the number of holes. Another important measurement is the diameter of the center hole. Example: on some models of Nissan and Mazda cars the lug pattern was the same but the center hole was smaller on one and would not interchange. Don't know if it is true for current production, but earlier full size Ford and Chevy lug bolts had different spacing. The Ford spacing was used on the 3500 pound capacity trailer axle I bought recently.

KEH
 
The first number is simply the number of lugs. The second number is the diameter of the circle on which teh lugs are centered.

The first one you cited would be called "five on 4 and three quarters", the second "five on 4 and a quarter".

On even numbered bolt patterns (sixes and eights) it's easy just measure center to center on two opposing lugs. On 5s, you have to get into a little trig. Measure the distance between the centers of two holes or lugs. Take half that distance, and divide it by 0.5878 (which is the sine of 36 degrees, half the angle between the lugs). That will give you the radius. Then just double that number to get the diameter.

Ex. You measure 2-15/16" between the centers of two lugs. Half of that is 1-15/32". Convert that to decimals and you get 1.4688. Divide by 0.5878 giving you a radius of 2.4987, making the diameter 4.9974". Call it 5" and chalk up the difference to a little inaccuracy in your initial measurement, and you have what would be called a "5 on 5" bolt pattern.

The 0.5878 works for any five-lug pattern.
 

Ok, I stand corrected on the lug pattern. Anyway, a simple way to see if lug patterns will match up assuming number of holes is the same is to measure the distance between 2 adjacent holes is the same and see if the center hole is the same. If I measured correctly, the distance for Ford wheels is 2 5/8, for Chevvy 2 13/16, lug bolt to lug bolt.

KEH
 
Yep, 2-5/8 is 5 on 4-1/2" and 2-13/16 is 5 on 4-3/4"

You make a good point on the size of the center hole, though, and another issue is the offset. And certainly straight measurements will do for comparing two wheels. You don't need all the arithmetic unless you're trying to figure out what you've got or what you need.
 
Ford and Chev. 8 bolt wheels have the same 8 bolt
spacing, but the center holes are different. A
Ford wheel has a larger center hole, and will
fit a Chev., but chev. has a smaller center hole,
and won't fit a Ford.
(now, someone will probably correct me ??)
 
Ford and Chev. 8 bolt wheels have the same 8 bolt
spacing, but the center holes are different. A
Ford wheel has a larger center hole, and will
fit a Chev., but chev. has a smaller center hole,
and won't fit a Ford.
(now, someone will probably correct me ??)
 
greygoat,you were right until 1998 when Ford went to their own 8 bolt pattern hubs.Up until that time all(Ford,Int.,Dodge)would interchange on each other and on most if not all trailers too.Chevy and the trailer wheels had the small center hole and wouldn't work on the Fords.
 
on 5 lug wheels, measure from the center of one bolt hole diagonally across to the outside edge of another bolt hole- i know it sounds way wrong, but it will generally get you the right 5 lug bolt circle. I know, i know....but try it, i'll be dog-goned if it don't work!
 
Leaving the Orient for a moment, you can also measure center-to-center and multiply by 1.7. Not quite as accurate, but close.
 
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