Joe, Thanks for the PM. I am going to ask Rob @ S Car Go about this. My spacers are not installed as you said above. My original studs were removed and longer studs added. The spacer is concentric and slides over the studs. I do not bolt the spacer to the hub and then the wheel to the spacer. I am also talking about a spacer that is less than half an inch wide. From a mechanical stand point I can't see the difference. On this point I may be blind. Again, I will put this question to Rob at S Car Go Racing. Thanks.