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When I put the new tires on my truck, I did a coastdown test at 32 PSI, then repeated the test at 47 PSI (sidewall maximum). The difference was dramatic.
I get excellent traction on snow and ice at the higher pressure. The only negative is rumbling and banging over tar strips.
Tires are Nokian WR size 235/75R15. This is 2% larger than stock.
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