so for the past 1000 miles or so ive ridden without getting a single flat. impressive, i thought. then this past week, everything went to hell in a handbasket, and i've been through 3 tubes and a whole patch kit. rear tire of course. each time ive checked the tire for glass or other crap and turned up nothing. the last 3 times ive actually taken the whole tire off the rim to look for stuff, nothing. there is still plenty of tread on the tire (continental gatorskins). the rim doesnt show any signs of damage, and i have a good cloth covering around the nips. the one i got today was the weirdest yet. i put a new tube in this morning, pumped it up to 125psi and rode about 25 miles total, while doing stuff in between the two rides. i got home about 5 hours later and checked the pressure and it read 70psi. i topped it off at 120 so i could determine how fast it was losing air, checked a half hour later and it was at 60. by the end of an hour it was completely flat. why would it lose air faster for no reason? why am i being plagued with these flats at a time i cant afford to take the train?!?