I don't understand the impulse to break bottles all over the street, but there it is. On my route through southwest Philly there are blocks where the sound of glass crunching beneath my tires is the loudest thing I hear.

No question that a sharp piece of bottle class standing upright can slice your tire, but I guess I've just managed to dodge them successfully. For the rest, I've been pretty happy with the Conti TT 2000 and Avocet Cross K's (both 700x32c, both pumped to 95psi religiously) on my two bikes -- at least, I've had no flats with the Conti's and only one with the Avocets (that was the one 8000 miles ago, 4000+ miles ago on that particular tire, it was almost brand new at the time).

Maybe I'm just so slow I have more time to dodge the glass than the younger, faster riders do!

RichC