Originally Posted by BYuen
A 2" wide spacer wouldn't put any more pressure on things than a wheel with equivalent backspacing.
Just to nit-pic there is that chunk of spacer that is probably thicker than most rims with proper backspacing have. It would add more to the rotational inertia. So putting an aluminum rim with proper backspacing against an aluminum rim with a spacer, the one with the spacer would add more stress to the system if both rims were proportionally the same.
But, not anything I would think would cause near as much as a heavier steel rim in any regard. Sorry to nit-pic.