Quote:
Originally Posted by ML
This would be negligible compared to winter tires(or chains!), and under inflation.
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Well yeah, I was assuming he already knew to get winter tires. But I question underinflation... I think it's only good for getting out of deep snow. But for grip and traction on hardpack snow and ice, you want normal inflation so that there is more pressure pushing into the ground. But the pressures are already pretty high on these cars so maybe dropping a psi or two for a little extra sidewall flex would be OK.
Now underinflating the stock or summer tires is a good idea so that they can try to build some heat into them. But obviously that's only if it's just cold tarmac and there is no snow. Tires are not going to warm up on snow and if anything, they'll just get a bit colder. But they'll probably get underinflated by the cold anyway. You lose about 1 psi per every 10 degrees F. If you want an accurate reading though, check your pressures after the car sits out in the cold.