I am looking for a good buy for a spare tire to carry when on a road trip. I'm content to use Roadside Assistance when in the metropolitan areas, but I'm worried about getting caught with a flat in the middle of nowhere when on a road trip. My plan is to have a fully mounted and inflated tire in a zippered tire bag in the back, so that it can be swapped with the flat if needed. I'm not planning to do the swap myself, so not worried about having a jack or cracking the nuts myself.
I have stock rims with Michelin Primacy MXM4 245/45R19 98W. I have Air Suspension if that matters. Since it will be a spare, it doesn't have to be a perfect match to the other tires, although I don't want driving on the spare for a while to do any damage either.
Any/all recommendations welcome. I'm located in Seattle/Issaquah area if anyone has a local recommendation. I'm not adverse at all to purchasing online.
2015 Model S 70D (VIN 90890)