depends on the style of spacer too

if you get the normal spacers from super crap, ye they're illegal, they also don't have CBL rings etc, and are dodge..

the spacers you can buy which you bolt onto the hub using the original wheel studs, and then have a second set of studs built into the spacer you will find the pits/police will most likely accept, as they don't put reduce the amount of thread turns your wheel nut is using to hold the wheel on..

ive seen a couple of cars with spacers loose wheels as there has only been 4-5 turns of thread left after they put the spacer on, this ain't enuf..

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