I cut a 13.42 with 18x9.5 Chrome Z06 wheels on 275/35/18 BFG DRs, since then I sold them and just bought the Black Zr1s, 17x11 in the rear wrapped in 315/35/17 BFG DR's.

I was wondering if I'm gonna notice a difference in maybe 60' times? The wheels weigh about the same.

 

I've run both 315s and 275s...I saw no difference at all in 60' so I stayed with 275's...mine were 17s in both cases, so with all else being equal I stayed with lighter and cheaper...
--Alan