315's because 600hp supercharger....... 275's because why not... Doesn't rub, with the exception of hitting a really nasty bump and even then, it was soooo minimal... Can turn wheels lock to lock with no rub. And it grips like a son of a bitch, turn in on corners makes this thing feel like a go kart
Only thing, with the PSS tires, they pick up and hold a lot dirt/dust... So when you mash the loud pedal you get a fun little bit of tire spin