I'm thinking about picking up another set of wheels. Just wanted some opinions on how my ride/handling will change if I go with the same size tire 275 45 18 in front and back.
Im looking a getting a set of rp-02j 18x 9

 

275-45-18 is a bit too tall. go 275-40-18.

Nissan USA also recommends a 1/2" to 3/4" difference in tire height to front and rear so technically you should do a 245-40-18 and 275-40-18.
Enkei Rpo2-j
Go 18x8 +35 19.0lbs
and 18x9 +35 19.9lbs

 

Im trying to get a set that not only perfor well but can also be rotated. tires are to expensive to be buying them ever 3-4 months can I put rp-o2 in 9" on front and back?

 

I doubt rotating the tires will help much. Both the front and back tires in my car have been replaced once (fronts at 16K miles, rears today @ 21K miles) and all the tires were worn pretty evenly across the tire.

I was thinking of doing what you are talking about, and getting one size so I could rotate, but after seeing the wear pattern, I just don't know if it's worth the bother.

BTW, I'm now running 245/40-18 F and 245/45-18 R on the stock Performance wheels.

I'm getting RPO2j's for race wheels (18x8) and will probably be running either 245/40 all around or 265/35 all around for my race tires (still gotta figure out those tires).

-D'oh!