The wheel determines how far the tire will stick out. The wheels you have now will still be in the fenders, so either get some spacers or new wheels with a lower offset.

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So if i were to run a 295/70/17 tire id need wheel spacers?

 

it depends on how far you want the tires to stick out but the easiest way would have been to go with a - 12 offset instead of + 18 and maybe a 1 inch wheel spacer would be a option >>> tire size is the last thing to achieve what you want >>>

 

with a 295/70/17 tire with a 1" spacer how much do you think id have sticking out?

 

I would say your gonna have to trim but yes they should stick out.

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How far it sticks out depends on the size and offset of the wheel, not the tire. Currently you said you have a +18 offset which means it sticks closer into the fender. In order to achieve what you want you need to get new wheels with a lower or a negative offset. Just as the others above said, a spacer should work but just make sure you make sure the spacers stay tight and don't get loose.

 

what size tire came on your truck , 245 mm or 265 mm ? and you have gained approx. I inch with the 9 " wheels and the difference between +18 offset and OE wheels at +31 offset >>> My truck has 17x9 in wheels with minus 12 offset and 265 mm wide tires and my tires are out side fenders about 3/4 of a inch >>>

 

i have 265/70/17 on currently

 

while many people use wheel spacers successfully i would be inclined to steer you clear of them..because if they are not tightened correctly or periodically then you can lose a wheel and only hope to get lucky and not hurt someone.

i would chock it up to a learning experience, sell your current rims and get the right rims for the application you are aiming for

and as some pointed out....stop thinking about the width of the tire.. determine the offset and the back spacing you require and then worry about the tire...

 

It's not rocket science. Here are pictures:

Your wheel is like the one on the right side. Imagine you are looking at the front of your truck (looking past or through your grille). Now the wheel on the driver's side is atomically correct to the wheel on the right side in the first picture if you consider the driver's side wheel. The hub for the wheel is setting right of center which would push your wheel/tire assembly under the truck. Conversely, my wheels are a -12 offset, similar to the wheel depicted as the left wheel in the first picture. The hub is left of center, pushing the wheel assembly out from the center of the truck.

EDIT:
Maybe this will help.