Snow Tires/Blizzard Mountain Questions

For the cars that can be fitted for snow tires, are the snow tires automatically selected in the default settings when you go to Blizzard Mountain, or do they need to be applied manually? Likewise, if I download a tune for a car that can be fitted with snow tires, does the build/tune have to specify the snow tires, or will they automatically be applied when I am on Blizzard Mountain? For example, the stratos has snow tires, but if I download a build/tune that does not use snow tires, and I run the build at Blizzard Mountain, and assume the snow tires would not override whatever tires were used in the build/tune, correct? Sorry for the dumb questions. I wish the setup search had snow tires as a filter. Is there ever a case when you would not want to use the snow tires on Blizzard Mountain? Thanks!

If the tune uses snow tyres or rally tyres then it has snow tyres on BM.

If the tune uses any other tyres then it will keep those tyres and not swap to snow tyres (automatically).