Well I am planning on getting some aftermarket rims. What I am looking at is 20x10s. What I need help on is the offset? I want the tire and rims to flush up or maybe push out of the wheel well an inch. The tires I am looking at are terra grapplers 325x60/20. I am a total dumb a** when it comes to figuring out this sort of thing. Please help is needed.

 

Good luck tucking 20x10's on an F150. With the same offset as the stock wheels, you will be adding 2" more wheel to the outside edge of the wheel. Measure two inches out from the outside edge of your stock wheels and that's where the 20x10's will come to. If the tires are wider than the wheels, then the tires will be even further out.