Hi, I live in New England and I'd like snow tires for my new S85D. I'd also like to do this through my local SC, but I've read many not-so-good reviews of the Pirellis they sell. I'd like to get the 4 wheels and TPMS through Tesla. The package is $2500. They will also do free change overs when I need to go from summer to winter tires and back; all for free. When I asked them if they would install another tire that I buy myself and they mount and install, they said no. They only mount the Pirellis that they sell in the package. I know I could go elsewhere to get this done but should I be more comfortable with getting this all through Tesla? I've heard that Town Fair Tire does this. I'm kinda torn about what to do. I was hoping to get the SC to install other/better tires. As an aside, why don't they sell better tires? thanks.