I'm convinced flats are random. Something cuts or punctures the tire into the tube, pinch flat, or tube leaks at the valve stem. I've also seen little difference among tire brands regarding flats, most good tires perform very well. I've used:
Conti 4000
Conti 4000s
Michelin ProRace2
Vittoria Corso
Bontager RaceXLite
As for tubes, I tend to buy mostly on sale, and haven't noticed much difference. Some hold air better then others, but seems to vary tube to tube rather then across brands.



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