You may have been better to say it didn't grind or you grinded/ clearanced the caliper to accommodate the wheel. :dumb:
You quoted 5mm.
5mm removed from the center a wheel makes the way for a nice fracture line given the right impact. 5mm is a LOT of material.
Thankfully, we can be sure that your guess was way off as you'd have a hell of a time putting the wheel on with 5mm of caliper protruding. However, we've all seen amazing things done with impact guns before...
People are concerned for your safety, and their own though. :no:
For Reference, here is a 5mm spacer:
http://www.vorshlag.com/images/catalog/products/wheel_spacers_5mm_03.jpg