i had 20s and Michelin all-seasons on my Landcruiser and didn't have any problems riding in snow or freezing temps... but don't get me wrong, it wasn't like it stuck to the ground... they were'nt winter tires..

light snow and cold temps on all-seasons isn't as bad as people think...

i never swapped tires from season to season... it does make sense though..

for my 08 X i plan on keeping the stock rims/tire combo for winter driving since i'm getting delivery in late Dec... but once warm weather hits i plan on swapping them out to 214s w/Michelin Latitude Tour HPs..

20s aren't bad at all... and in the snow you're taking it easy anyway...

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2012 X5 50i M-Sport
2014 X3 35i M-Sport