Quote:
Originally Posted by Frishkorn
Some do, Firestone's I know are sipped from the factory. But there are some that aren't (can't remember the Chinese brand that my first set were). It's easily identifiable however. Still, I get blank stares when I mention sipping every winter to folks. Figured it was good food for thought for anyone thinking of buying snow tires and something to look for.
I still highly recommend having it done on all-seasons for your normal daily drivers for the winter. On ice it just can't be beat.
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I'll admit to not having done my research, but I believe sipping tires does decrease tread life since the tread tends to squirm a bit more under load.