Please help with tire and wheel fitment

[raider1]

I need help from all the tire and wheel guru's. I have an '06 F250 Superduty crew cab FX4 PSD that is totally stock. I have an opportunity to buy a nearly brand new set of 305/65/18 tires for an awesome price. It sure looks like they will fit, but can anyone tell me if they will for sure? Also what size rim would be better, 18x9 or 18x10, and what offset will I need to make this work (if possible)?

The factory rims are 17x7.5 with a +40 offset and the tires are 265/70/17.

One local tire place said they would work fine but said I needed a -12 offset. This seemed odd to me since the factory wheels have a +40 offset, but I'm not to knowledgable in this area. Please offer advice.

Thanks for the help.

[powerjunky]

You should be alright on stock rims with those tires. I have seen guy's run 35/12.50's on stock 9"rims. The only problems you might have is with rubbing on the front bumper or the wheel well.But that is what why the sawzall was invented.

[raider1]

Thanks. My stock rims are 17's though and I need 18's for these tires so what width and offset would be needed or recommended?

[TYREBOYS_DEMAXIN]

with the wider wheels you want a -offset(not sure on the right offset but that sounds about right)or else the tires will hang out the side like a overgrown wart.with the wider wheels and taller tires you'll need a lift to make everything work right..