Re: 275/40/17 fronts and 285/40/17 rears affects on handling? (out2run)
None at all. My 1993 40th Anniversary Coupe with ZO7 suspension came with 275s front and rear on 9.5" wheels. I immediately changed to 285s in the back and never had a problem. But don't put the 275s on the smaller (base) front wheels. The 285s would benefit from wider rear wheels, but will work OK on the stock wheels.