I got a Mustang GT 2014 base model no brembo brakes.. just got some aftermarket rims for it, str607 cv3s 20in 9 front and 10.5 rear 30 offset front and 35 back. can I do 295/35/20 tires? or 285/35/20 is that the wides and bigger I can go? I want to do the 35 ratio so i can fill the gap cuz i dont want to lower the car and i think the 30 ratio is two small? Or is it best to go with 295/30/20 front and 255/35/20 front? Why do people always go with a lower ratio on the back and higher in front? I really need help with this.. thanks

 

295s are going to be too wide for 9" but ok on the 10.5" wide wheels.

This might help...
http://www.tirerack.com/tires/tirete...e.jsp?techid=7

keep in mind that if you deviate from the stock diameter, your speedometer will be off...



Personally, I'd call Tirerack and tell them what you're trying to do.