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I actually looked at the St Maxx tires as a replacement for the AT3. If I could have found someone to sipe them, I might have put a set on.
I have 2000 ft of elevation change between my home and work and when the roads get icy it's a lot like an Olympic luge run. The heavy, big lug, AT tires turn into skates after a few thousand miles. I really need an all season heavy siped tire that can hold up to a lot of miles. I think these Michelins will.
What wheel width do you have the 285'S on? With stock 7" wheels warranty is void on the 285 size which are recommended for a 7.5 wheel and up. The companies are pretty good at CYA. If they can get out of something they will.
That's on the tire shop.
Technically, "we" are stupid, unknowing consumers laying victim to the mercy of repair facilities. I didn't go to Tire School so they know more than me. No one said boo so as far as i can see...its covered. My 2 cents