I don't have any experience with the T-Serv, but I can speak for the Urban Max and the Road tire "Extreme Duro". In about 10K miles combined, I have flatted once on my Panaracers. Could be luck; could be their protex liner. In the same time frame DH has flatted a few times (Note: I ride the gutter, he gets the cleaner road).
Anectdotal #1...In Tucson, I had a thump, thump sound coming from the front wheel. I stopped and pulled out a goathead. I waited. No flat? Really? Never punctured the liner. I was good to go.
Anectdotal #2...Bad bicycle owner, I forgot to check the tread on my tires and went on vacation. As I was packing my bike up to put it back in the box I noticed that sections of the tread were missing. I'd worn the tire down to the liner. No flats. When I removed the tire, I took a thumbtack and played with it....went through the sidewall like butter (road tires don't put the liner in the sidewalls), but I could not drive that thumbtack through the protex liner. Tough stuff.
So my flat? Last Sunday I flatted (while standing next to my favorite LBS guys at the start of a century). All 3 of us were in complete disbelief that I managed to flat a Panaracer Duro. But it was a really nasty piece of glass--almost 1/2 inch.
My commuter bike needs new shoes.....she's getting another pair of Urban Max.



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