I have a 05 g35 coupe. I'm running an 18x8.5 wheel currently. How wide in 18 or 19 do I need to go to be able to run a 295-315 on the car. wanting a wider tire?

 

Welcome to Driver Andrew! You must want a wider tire for looks, it's not needed for traction! I'm running 10.5" wide Volks out back and they're a perfect fit for my 285/35X19 Michelin Pilots SS! I could run 295s but that would create an unwanted bulge!
Gary

 

Hey man thanks. yeah it's just gonna be for looks for sure. I just love the way wide ads tires look on the rear of cars. so 10.5 would be perfect?