I have no magic miles number. I use tires until they wear through to the under tread unless a big cut, or age weakens the body plies until they look ready to let go.
Rear tires usually last about a year or so, but I've had fronts last over 20,000 miles.
BTW - the flats might be unrelated to anything except a run of bad luck. I've gone over 3,000 miles between flats, and have also had 3 unrelated flats the same week.
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Last edited by FBinNY; 04-01-14 at 11:08 AM.