Originally Posted by gazm
How are you supposed to know where the puncture is? Memories of putting a bicycle inner-tube in a bucket a water to find the bubbles would be a little more difficult with a 19" wheel at the side of the road...
All my punctures have been caused by a nail,screw or stone getting stuck in the tyre.I think it is very unusual to have a puncture with nothing stuck in it unless the valve or tyre bead is leaking.