I went out on my CAAD5 yesterday evening but only got a few hundred metres when I heard a loud ticking noise that sounded like a broken spoke slapping a chain stay. As I slowed down to investigate, the rear tyre went completely flat and the cause was obvious when I stopped. The spokes were fine, but I had picked up a nasty 'hitchhiker'...
(Damn Chrome browser just lost the rest of this post!!

)
Ok, I will type it again!!
I walked the bike home and switched bikes for the ride...
I just got to work on the repair and discovered that the culprit was bigger than I expected...
It is hard to imagine how it got into the tyre at the angle that it did!
The otherwise new tube only has one obvious hole in it but I decided not to patch it in case the tack had damaged the inside of it. I cut the tube in half in case I changed my mind later!
I have GP5000 tyres on order for the CAAD5 and they were supposed to be delivered by Royal Mail today but it is now gone 17:00 so it looks like that will probably happen tomorrow now...
Stuck mid-fettle! It's a pity because I was looking forward to testing the new tyres this evening. I will have to go out on the other bike again.