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Perhaps styling enters in, but in earlier days an odd number of lug nuts seemed to have less effect or wheel warping and the associated vibrations. Still today odd number of attach points are often used where balance is critical. When it comes to heavy vehicles you may have notice six, eight, teh or more lugs. So as the number of attach points increases in number the load distribution is more evenly distributed and less critical. Today however it does seem that it has more to do with style as the previous poster mentioned.
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