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Originally Posted by JoeRockhead
The rubber in a performance tire will start to harden at 44.5 farenheit, or 7 degrees celsius. Once your temperatures are in that area it's a good idea to change sooner rather than later. Conversely, in the spring once your temperatures are over 44.5 you should switch back to the Diamaris because the rubber in the winter tires becomes too plyable and will greatly increase the wear on them.
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Agreed. Even though the snow really won't be flying until November or December, I switch to winter rubber on both my rides in mid-October as the temps start to fall. The Michelin Diamaris and Dunlop SP Sport Maxx tires I run in the summer are SCARY in colder temps...not worth the risk.
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2005 X5 4.4 (Sterling on Truffle) w/sport everything
2011 Audi S4 (Prestige, DSG)
2012 Audi Q7 (Sport, S-Line)
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