This is also why people snap wheel studs (happened to people on this site). There are rings that should be supplied with aftermarket, these go over the hub, when the hole in the middle of the alloy is too large so as the vehicles weight lays on the hub not on the studs. When not used, the hub isnt in contact with the wheel and the studs hold all the weight.
If the spacers u use are thin enough that ur wheel still rests on the hub, then it should be ok
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