Can I use wheel spacers to gain clearance between the wheel and the face of the caliper?
Yes, you can. We should however point out that wheel spacers are not recommended by the Wheel Industry Council, and may or may not meet certain legal requirements. That being said, wheel spacers can be a very effective means to gain additional (within reason) clearance where required. If you think about it, your slip-on rotor is a wheel spacer as well.
