Looking for a new rim style, need help with offsets

[utley]

I come across a set of Fuel Reaction D755 rims Im looking to put on my truck. Im trying to match the rims to the current fender flares that I have installed which stick out about 2". Currently have a 2" leveling kit installed with 305 50/20"s on a factory rim set that work fairly well, but Im in dire need to know if a -18 offset would work ok without cutting any fenders. Been searching for an answer for this for a few months but I havent really learned anything as I have peanut butter floating around my brain right now and nothing else sticks. Lots of help would be appreciated, would like to buy these rims soon. TIA

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I currently have some Nitto Grapplers on the truck at the moment.

 

[markabby]

 

[diymirage]

this is my all time favorite website for these things

Wheel size comparison calculator

Wheel size comparison calculator

wheelpcd.co.uk

i have allready entered your specs
so now all you need to do is figure out if that blue wheel (the new one) sticks out far enough for you to fill up your flares

 

[GTyankee]

Just think about the OFF SET
The Front Wheel Bearings Take a beating
Especially if the bearings are not top of the line

 

[utley]

Im mostly interested if rubbing fenders would be a problem with what I already have and if theres anything I would have to cut. I can deal with the wheel bearings and whatever, I only want to push the tires out about 3/4 to 1" or so. The fender flares in the back are mostly mud flaps and they do stick out about 2" and Im assuming the 305s will fill them out the rest of the way.