Who is switching to winter tires and steel wheels?

I disagree that the note in the manual about bumping up psi in snow tires is to account for a drop in ambient temperature for winter. I believe they would state that if it was implied.

I’d lean towards it has to do with the softer rubber compounds used in their design and how it affects drive feel.

But that’s just me.
Yes, I think you're right. While it does have something to do with it, It's probably to maintain tire firmness.

I am currently playing around with higher pressures in my winter tires, but I think that 36+4PSI will be too stiff.
 
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