Yesterday I had my first flat tire on my commuter track bike. but it was not a hole in the tube. No. It was the valve that got cut off when the Kryptonite lock touched it. Well – the lock is a huge chain and actually really heavy. But I was astonished that with one touch the valve broke off where it come out of the rim. And what a clean cut:
I was carrying all the tools with me (as every day) as well as the stuff to patch an inner tube – just not any spare tubes. Lesson learned: From now on I will carry a spare tube, especially when riding longer distances.