Okay... So, stock wheels are 7.5" wide, and "i think" have an offset of 52. Is this positive or negative?

The wheels I have currently are 8" wide and supposedly have an offset of 25. I don't know if this is positive or negative.

According to a nifty calculator I found, I have 21mm additional clearance with the after market wheels.

Does this make any sense?

Sorry for the metric.

 

Your MB Predators in 17x8" have 5.5" of backspacing.

Stock wheels also have 5.5" of backspacing.

Your current setup sticks out .5" further than stock but are the same distance away from your spindle as stock wheels. I'm not sure what you mean by having more clearance but hopefully this helps.

 

That helps. Backspacing is easier to compute than offset.

 

Offset is a useless spec. It's only used to calculate backspacing, which is what we really need to know.

 

Attworth, if your wheels are 8 inches wide with a 5 1/2" BS you can put 35's on them without rubbing. About as close to stock specs as you can get with an aftermarket wheel, or you may know this already.