ok im trying to figure this out but im getting stumped. i think im thinking about it to much. I originally have 17x7 rims with 225 50 17 tires.

My question is this. I have Konig Prophet rims that are 18x8 with a back spacing of about 5.75. the tire size will be 225 45 18. if there is a 1 inch or 25.4 mm spacer will this tire fit in the wheel well. This is in reference to this post i did yesterday
http://forums.maxima.org/showthread.php?t=558956

sorry if this sounds confusing. Thats what i am right now. Let me knoe if i f'd up and ill give whatever additional info.

 

I would get a wider tire for those wheels. And what's the offset? Anything under 45, and you're golden. Get a 15mm spacer for the rear and they'll look better(less 'tucked').