I am looking at picking up a set of Pirelli Scorpion Ice & Snow for my 4.8is. I am going to be mounting these tires on OEM Style 87s. I did a search and it seems like everyone is running 275/40/20 all around even though the rims are staggered. However, I saw on Tire Rack that these tires are available in 295/40/20 as well. So my question is, howcome no one runs 295/40/20 in the rears? Isn't 295 closer to the suggested 315 for the rears? The 295 tire would require less stretching than the 275 one. Am I missing something here? Someone please tell me what sizes I should buy.

Thanks