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  #16 (permalink)  
Old 03-25-2009, 11:41 PM
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A lot of the misconception out there comes from the fact that many people don't know how to measure the bolt pattern on a 5 bolt wheel. We ran into this all the time when I worked for a company that made circle track wheels. People tend to measure center-to-center acrossed two non-adjacent holes and thereby come up with an incorrect measurement.

For example, take your typical 5-on-4.5" bolt pattern Ford wheel. If you measure center-to-center acrossed the bolt hole pattern, you will come up with a measurement very close to 4.25"!! The correct way to measure is center-of-bolt hole to OUTSIDE EDGE of bolt hole, you will come up with the correct 4.5" bolt circle.
The most common mistake was someone measuring 4.5" center-to-center and then ordering wheels, when because of the flaw in their way of measurement the bolt pattern on the car was actually 5-on-4.75" GM pattern. Of course, the next phone call was that we sold them the wrong wheels . Just a little info for everyone

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Old 03-26-2009, 09:11 AM
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4.25

yes, as you have proven their are more than one way to measure bolt patterns, the center to center has been the excepted way by hot rodders for years, even measuring the way you sau would then make me 66 stang a 5x4.750 and his 69 a 5x4.5 bolt pattern, either way you measure it they come out the same, a 1/4" longer or shorter, but looking at all of the car manufactors specs GM, PONTIACS,OLDSMOBILE, FORD, DODGE, PLYMOUTH, AND CHRYSLER all have the same measurement as going from center to center not from center to outside edge, how do you explain that?. my mustang meassures 5x4.5 center to center exactly what the book says and my 62 cutlass meassures 4x4 as the book says all my friends all meassure as the books say, so i would conclude that, thats how they are measured,now wheel manufactures may tell you something diff although i just called about a set and they ask me if i had the 5x4.5 or 5x4.25, when i asked them how they wanted me to measure them he told me center to center, i guess depending on where you go is what answer youll get, eh, keep on roddin
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Old 03-26-2009, 10:38 AM
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look this over.................

http://adaptitusa.com/index.asp?PageAction=Custom&ID=4
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Old 03-26-2009, 11:27 PM
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5x4.5 lugs

Quote:
Originally Posted by FASTFORD
3 out of the 4 measure it center to center how bout that, i guess u dont measure all of them from the back of the hole to the center, only the 5 lug axels, so telling everyone that you measure ur wheels from back to center would only apply to one kind the other 3 would be wrong eh!!!
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Old 03-27-2009, 12:49 AM
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My post says specifically, 5-bolt wheel.......

I stand by what I said.
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Old 03-27-2009, 08:54 AM
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wheel bolt circle

The correct way to measure a bolt circle is to get out the drafting tools or autocad and draw a circle then divide it into segments of 4, 5 , 6, or 8 parts then measure from the center of the circle to the center of the wheel stud, as shown on the link above for 4, 6 and 8 bolt wheels. Going ftom the center of one stud to the opposite side of the second stud is close enough to identify most wheels but if you have your dial calipers out you will get different numbers and there are different wheel stud sizes. If you are programing your CNC use the draw a circle method to be most acurate. Sonnie Rossi 's business card is heavy laminated and has the scale on the edge and is great to do a quick check. If you see him at bonneville racing his Cosworth powered T bucket he will probably give you one.

Last edited by timothale; 03-27-2009 at 09:00 AM.
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Old 10-29-2009, 03:44 AM
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Ford Bolt Pattern 4.25"

I have found that many Ford bolt patterns are 4.25" also known as (108mm). I checked www.boltpattern.net and found that mustang, taurus, escort, contour, t-birds and windstars of varying years had a 4.25" bolt pattern, some where 5 lug and other where 4 lugs. Another great resource to find Ford bolt patterns is www.FordBoltPattern.com.
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