We got snow..should i air down?

It’s all the same shitstorm. PDX drivers are a joke.

 

Here is the reply I have from Nokian’s head office in Finland regarding winter tire pressures. I have replied asking specifically for his opinion regarding airing down and will post his reply if he comments on this.

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Hi Steve
Our recommendation when using Nokian branded M+S tyres is to use 20 kpa ( 0.2 bar) higher pressure level compared to summer tyres.

Main reasons are:
-better stability on bare road
-less heat generation à better durability
-more tolerance to weather temperature change ( 10 °C = 10 kpa )
-lower rolling resistance

Best winter regards:

Matti Morri
Manager, Technical Customer Service

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20kpa is approx 3psi which in the case of my Off-Road is 10% higher than the 30psi Toyota recommendation.