Im gonna buy those KMC Nova's for my 08 gt mustang they are 20'8.5 and 20'10 what size tires do i need to get in the front and back to not rub and im gonna put the pro kit lowering on it.

 

245/255 35 series tires for front and 285/295 35 or 30 series in the back and you should be fine. You might hit your bump stops with that low a spring on hard or rough terrain (like michigan potholes or speedbumps)! JMO but they are the standard for this rim size ( I am running the same rim sizes....)

 

so it would be ok if i went 285/35/20 in the back???

 

I have 255 35 20 & 295 30 20, but to play it real safe you can sub your rears w/ 275 35 20.

 

do the side walls look bad if the front is 35 and the back is 30?????