I have 3/8" spacers on the front of my '87 Mustang, to clear my calipers, never a problem.

I have 1" wheel adapters on the rear of my trike to hold a pair of Rocket wheels on for 6 yrs, never had a problem. I pull wheelies all the time, 1st thru 3rd gear. I slip the wheelie bars on and go out for rice all the time . I machined up my own 1 1/2" spacers to put custom offset wheels on my wifes '27 Tudor Sedan, they are stronger than the wheel they are holding.

Not all wheels use the hub for alingment, mostly un-lug wheels, My wire wheels(steel not un-lug) 8"x15" & 9"x15" on my Mustang use the lugs. I hit a hole in the road and broke about half the spokes on one front wheel, didn't do anything to the studs with the space plate being on it.

Pat