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    Author Topic: Lug nut spacing...sorry I have to ask  (Read 868 times)

    Offline femtnmax

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    Lug nut spacing...sorry I have to ask
    « on: October 31, 2009 - 09:34:44 PM »
    I measure just over 4.25 inch center to center between lug nut studs on my 74 challenger, yet everyone says the spacing is 4.5 inches.   So what gives?
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    Offline GoodysGotaCuda

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    Re: Lug nut spacing...sorry I have to ask
    « Reply #1 on: October 31, 2009 - 09:37:00 PM »
    It's 5x4 1/2". Somehow you are 1/4" off, what give's I'm unsure..but thats what it is!  :cheers:
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    Offline moparmaniac59

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    Re: Lug nut spacing...sorry I have to ask
    « Reply #2 on: October 31, 2009 - 09:42:12 PM »
    I think maybe you are measuring on a straight line and not on a radius??




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    Offline femtnmax

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    Re: Lug nut spacing...sorry I have to ask
    « Reply #3 on: October 31, 2009 - 09:55:49 PM »
    Quote from: moparmaniac59 on October 31, 2009 - 09:42:12 PM
    I think maybe you are measuring on a straight line and not on a radius??
    Yes, I'm measuring straight line between centers of lug nut studs.
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    Phil

    Offline GoodysGotaCuda

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    Re: Lug nut spacing...sorry I have to ask
    « Reply #4 on: October 31, 2009 - 10:03:18 PM »
    Quote from: femtnmax on October 31, 2009 - 09:55:49 PM
    Yes, I'm measuring straight line between centers of lug nut studs.

    Straight line between two opposing lugs is 4.5", any ebody
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    Offline the_engineers

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    Re: Lug nut spacing...sorry I have to ask
    « Reply #5 on: October 31, 2009 - 10:44:27 PM »
    On 5 lug, you must measure from the center of one stud to the outside edge of the opposite lug.  Summit has this outlined in the wheel section of their catalog or here...
    http://www.summitracing.com/expertadvice/storydetail.aspx?id=8dea7fa9-65a2-4eed-bca2-b6772b808801
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    Offline Changin Gears

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    Re: Lug nut spacing...sorry I have to ask
    « Reply #6 on: October 31, 2009 - 10:57:16 PM »
    Quote from: the_engineers on October 31, 2009 - 10:44:27 PM
    On 5 lug, you must measure from the center of one stud to the outside edge of the opposite lug.  Summit has this outlined in the wheel section of their catalog or here...
    http://www.summitracing.com/expertadvice/storydetail.aspx?id=8dea7fa9-65a2-4eed-bca2-b6772b808801


    If there are an even number (4,6,8) you can measure center to center to get the diameter, otherwise you can use these kind of tricks.  You could run into problems though with over size studs.
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    Offline dodj

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    Re: Lug nut spacing...sorry I have to ask
    « Reply #7 on: November 01, 2009 - 07:04:12 AM »
    Didn't the 'A' bodies use 4.25"?
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    Offline Changin Gears

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    Re: Lug nut spacing...sorry I have to ask
    « Reply #8 on: November 01, 2009 - 07:06:02 AM »
    Quote from: dodj on November 01, 2009 - 07:04:12 AM
    Didn't the 'A' bodies use 4.25"?

    Early A-bodies had a 4" bolt circle.
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    Offline BIGSHCLUNK

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    Re: Lug nut spacing...sorry I have to ask
    « Reply #9 on: November 01, 2009 - 10:56:17 AM »
    I've been through this with my guys a zillion times over the years ... thats why its called a "bolt circle" the measurement of the circle directly accross..  :thumbsup:
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    Offline femtnmax

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    Re: Lug nut spacing...sorry I have to ask
    « Reply #10 on: November 02, 2009 - 09:57:50 PM »
    Quote from: the_engineers on October 31, 2009 - 10:44:27 PM
    On 5 lug, you must measure from the center of one stud to the outside edge of the opposite lug.  Summit has this outlined in the wheel section of their catalog or here...
    http://www.summitracing.com/expertadvice/storydetail.aspx?id=8dea7fa9-65a2-4eed-bca2-b6772b808801

    YES...doing this gave a perfect 4.5 inch bolt circle.  Thanks for all responses.
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    Phil
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