i'm sure many have beaten this subject to death, but does anyone know how much diameter tolerence the viscous coupling can tolerate? seems to me the thing has to tolerate quite a bit for the car to be able to goes around corners without scuffing the tires and i for one, don't like the prospect of having to replace all four tires at once if one or more is substantially above the legal limit. consider this, if i have a road hazard warranty and one tire blows after say 10k, would that mean i still have to buy 3 more? seems ridiculous and i'm hoping has some sort of an answer. not to mention how environmentally unsound this can be by having so many half worn tires stacked up.