What would happen if I put 235/40/17 front AND back or 225/45/17 front and back on my Z? It's almost time to change my tires because when I bought the car they were already feathered.

 

Or 235/45/17 front and back?

 

it will mess up you TPMS gauge and most likely set off your TCS light and kill your throttle.

 

Do you have VDC?

 

I wouldn't run 225 in the rear. My snow tires are 225/55/17 in the rear and they spin way to easy, may just be the winter tire compound too though. I'm moving up to F:245/45/17 R:255/45/17 this week hopefully if the tires come in.

 

i've had contisportcontacII 255/45/17 in the rear and the fitment was perfect.

 

No I don't have VCD just traction control. Whats about the 235/45/17 front and rear since 225 is out of the question? Any problem with having 235 on the front instead of 225?

 

OEM +0:
235/45/17 front
245/45/17 rear