Originally Posted by 3Ms75Argosy
Offset refers to the distance the hub-face is mounted in relation to the rim.... so, if the hubface (the lugnut mounting surface) is directly in the middle of the rim from front to back, it's zero offset. If the hub surface is mounted more towards the rear of the rim (so that the wheel is pushed forward), I believe this is called Negative offset. Most rear wheel drive cars / trucks have this. Positive offset is when it's mounted more towards the front of the rim, making the wheel more inboard in relation to the hub (like most frontwheel drive cars..). I hope this makes sense. I believe the Tirerack.com has something about this in the wheels section.
Wheel Tech - Offset
More negative offset would make the rim go away from the wheel wells.
No problem about the old axle, I thought it might be illuminating to what's going on.
I checked with my Detroit wheel guy today and he said that I should be ok. However, he said that if I needed more clearance to go with the negative offset rim............thanks very much...............toastie