do you all think 235/40/18 would fit all around instead of staggered 245. I know the front rims are 18x8 and the back rims are 18x8.5 would this cause problems with fitting 235's all around let me know. thanks

 

I don't fitment would be a problem, the diameter might be however. Overtime your odometer will read incorrectly.

 

According to everything I've read(Brochure, manual, magazines), the wheels are the same size. I've heard the offsets may be different but I haven't seen any written documentation of that.

 

I think your VDC would get screwed up without the stagger. You might want to investigate that first. There have been server posts about the problem in the past.

 

you can always test it in a parking lot

 

I thought they were all 18x8 right?

D. Graphite/Graphite | Premium | Splash | Clears | Pedals | 35% TINT | Z-Tube | 4080 Stealthbox - JL 10w3 | Escort 8500 | PIAA's

 

The main issue is the overall rolling diameter of the wheel/tire.
The VDC, ABS, and other electronics monitor the rotation rate. At a given speed, the smaller fronts are rotating faster than the bigger rear tires. If you put on bigger ones, it may screw these systems up.

You could possibly go w/ a 245/40-18 (vs. stock 45-series tire) to decrease the diameter.

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2004 6MT DG/G Coupe | Premium | Aero Kit | ClearBra | See profile for pix

 

Just wanted to throw in with the others who have noted this already. The stock 18's are all the same size. I posted this info a month or so ago (a clip from one of the technical manual page). If you need it check my old posts.

2004 G35c AT/Prm Pkg/Sport Pkg/Aero Kit/Clear Sides/Pedal Kit/Tint/Z-Tube/K&N Drop-in/Smoked Rear Overlays/Gialla Grill

 

LOL, I went down six posts and my old message was there.

https://g35driver.com/forums/showfla...t=1#Post347094



2004 G35c AT/Prm Pkg/Sport Pkg/Aero Kit/Clear Sides/Pedal Kit/Tint/Z-Tube/K&N Drop-in/Smoked Rear Overlays/Gialla Grill