dont know if this has been mentioned yet but perform a tyre inspection after or before every ride. A few nights ago i did my first ever one on my Duranos and i have literally picked out small but sharp stones and bits of glass that have become embedded in the tyres with a small screw driver. I have also noticed the odd small deep hole that has gone right into the blue puncture protection layer. Needless to say, the tyres are still good but I cant help worrying about having to stop at the side of the road with a puncture - I always roll with one spare inner tube at least so if the inevitable happens then i wont be completely stranded. Im a careful cyclist. If i see glass on the tarmac then i'll try to avoid cycling right over it. Puncture protection doesnt make tyres invincible.