Got back from a ride 2 months ago. Went to lube chain whilst still warm, when I saw a nail head sticking out of tyre!!! Pulled it out with pliers (bad mistake...), &: ssssssssssssssssssssss............... all air went out.... AA man came out & put can of 'Slime' into tube, then inflated. Was fine for a week before I got new tube at dealer! I think they do an emergency kit to get you home - could be an answer. Still, its just really bad luck I guess!!