I m currently running 2004 g35 coupe 7 spoke 18's 30mm(Pic's Below) with tire specs of 225 45/18 Front & 245 45/18 Rear. I want to keep the front tire setup the same but a slight stretch in the rear, and i was wondering if i did 225 45/18's all around (for a slight stretch in the rear) how will that look? another thing i also wanted to put spacers, but didn't know what size i needed.... or do i need to change the entire setup for that look...

want front & rear flush like this..

looking for flushed look...and also my rear panels are rolled a bit here's my car...

 

Measure your clearance. I'm going to guess you have 15mm before it'll rub.

Stretching is dumb if you ask me. Easier rash plus less traction and is aesthetically wtf. Meaty looking tires is where it's at.
Leave stretching to the VW retards lol

 

ok so you're telling me to do 225 45 18 all around, i also noticed 235 40 18 are a gr8 math for these wheels.

 

I'd do 245/40/18 all around.