Most flat tires are caused by, well... a puncture to the tire that flats the tube. I usually keep using the tire and patch the tube.


Only trouble is if there is a large cut in the tire or the bead breaks.

Also, if a tire has high mileage, it will be more prone to frequent flatting... if the tire is old, it is time to replace.

The only thing less cool than carrying a flat kit/pump is being caught without one.