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Thread: Wheel spacers on stock wheels

  1. #1
    Building Boost Art Vandelay's Avatar
    Join Date
    May 2012
    Location
    St. Louis, MO
    Posts
    52

    Wheel spacers on stock wheels

    I'm having clearance problems with front coilovers and stock wheels/tires, and it's requiring me to run 1/4" spacers up front to keep the lower spring perch from rubbing the tires. I don't know how to determine whether or not I need longer wheel studs, and if I do need them, which ones do I need. Somewhere on MM's website, it says that you need 6 full turns of lug nut engagement, and mine get to be finger tight at about 5 1/2 turns, so I'm probably still a bit short overall. There is also a rule of thumb (not sure how true it is) that the depth of your lug nut engagement should be equal or greater than the diameter of the stud, and I am short on that metric.

    I think the car is fine to drive around casually, but I don't want to be on the margins with this. What are the specs of the stock studs, and is there anything I need to look out for if I decide to change them? The studs that MM sells say they require open end lug nuts, but I don't know why that would be the case. I will be using stock SVO lug nuts.

    My other alternative here is to slot a mounting hole in the strut to angle the top of the tire away from the strut. The MM struts are already slightly slotted, I don't have any major concerns here, but I want to keep it to a minimum, if I do it at all.

    The car is stuck on jack stands during prime driving season until I figure out where to go with this.

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  2. #2
    Red Captain MikeFleming's Avatar
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    Jun 2011
    Location
    Tucson, AZ. USA, Earth
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    4,924
    You can indeed slot the struts and find another way to compensate for the camber change. There some posts on how I did this to the KONI DA Fox struts on the Red Baron.

    On the thread engagement "standards":
    for non-critical threads - AT LEAST one full diameter of thread engagement
    For critical or high-load applications: 1.5 to 2.0 x diameter thread engagement.

    Personally I would want at least 1.5 x dia on wheel studs and 2x on main bolts, head bolts, etc.

    The stock studs are 1/2-20 thread. You want between 0.5 and 0.75" of thread engagement at finger tight. This is not a place to have a failure, imho.

    Most aftermarket longer studs are WAAAAY long, like 3" and the nut must be open-ended so the stud can stick out - need a deep socket to install them. Or you get to custom-shorten 20 studs to work exactly as you need. As we say "Flavor to taste".
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  3. #3
    Building Boost Art Vandelay's Avatar
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    May 2012
    Location
    St. Louis, MO
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    52
    World's slowest mechanic checking in.

    Thanks for the input, Mike.

    I slotted out the strut hole a bit, and now I'm just barely clearing on the driver side, and just barely not clearing on the passenger side. I think I want to leave it there for now, and combine that effort with smaller 1/8" wheel spacers. I'm also long overdue for new tires, and that may change the clearance just a bit, so I'll re-evaluate when all that is done.

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