Posted by ScottyHOMEy on February 03, 2009 at 10:53:00 from (64.222.201.63):
In Reply to: Lug bolt pattern posted by GentleBen on February 03, 2009 at 10:25:21:
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.
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