Originally posted by Diabolik
What abou 16x7's with a +42 offset? Would they rub?
This is a wheel offset calculator:
http://toy4two.home.mindspring.com/offset.html
So you enter in a 7.5" wide rim with a +45 offset, and a 7" rim with a +42 offset. According to the calculator, the 7" +42 wheel will have 9 mm more clearance with the shock housing, and 3 mm more clearance with the outer fender. Quite handy.
Originally posted by teg_fan
I don't understand why a +40 would stick further out than a +45, I thought it was just the placement of where the hub connected to the outside of the rim ex: stock(standard, not alloy) rims are like in the middle and aftermarket ones are more towards the outside it seems.
Think about it this way: the higher the offset, the further the wheel gets "pulled in" towards the car.
The offset is the distance between the hub mounting face and center line of the wheel. The link I posted above should give you a decent explanation of what exactly it is.