I just had a flat last night myself, my first in a long time. I was running sefas 700X38's with puncture protection and a green piece of the devils guitar pick stuck in it. When I stopped and removed the tube I carefully looked and felt around the hole and saw nothing, I didn't see the glass until I got home, maybe it didn't really cause the flat, the hole it the tire looked shredded. I'll bet the glass just made multiple slits as I slowed to a stop. It was a pretty big piece of glass, shark tooth shaped, just like somebody else had mentioned.

I thought the slit looked big so I ran out and got some michelin transworlds today. When I was trying to find the hole in my punctured tire I could not find it, maybe they are OK to ride after all, I think I will like the smaller michelins though. I am thinking of putting the michelins on the front and the wider serfas on the back the next time I do a tire change.

I forgot to add that it had been raining but had quit when I got the flat. I had gone to the store and loaded down my panniers with a 12 pack of odules, a 6 pack (to balence the load) of a different beverage, and some banannas. I wonder if the glass was stuck in the tread and the wt caused the flat. I wound up calling the sagwagon because she had just gotten home and it was easier. A long time ago I could change a flat in 5 minutes but guess I have not had as much practice. I have to wear glasses now and although my headlight makes a good flashlight it was no substitute for a small headlamp. I could have changed it if I had to but I took the easy way out.

I'm wondering if the "tread" on the commuter tires traps stuff more than slicks. I am kind of bummed because the road from the grocery store has a lot of debris on it and loading my panniers will be risking a flat.