can i use 205x75x15 front and 285x60x15 rear without rubbing the fender?

 

I dont think you would have any problems with that size on the front,i guess it just depends on the backspacing of the wheel.As for the rear,i dont know the specs on a 285/60,but i have 275/60 on mine and they fit fine with no rubbing,i had 275/50 on my last camaro and they were a tight fit,but they did clear,same principle the wheel has to have the correct back spacing.

 

like B.M said, it 's all about the backspacing. I have 235/60's on front and 28x12's that have a section width of about 12.2" and tread width of 10.4" on back and they tuck in the fender and don't rub. I have 5.25" backspacing on the rear though