TweetyPot (my 29er) has been out of commission since two weeks ago due to damaged tubes.
First, after pumping the front tire in preparation for a ride, it got suddenly flat. There's no time to fix it, I used AlitePot (my 26er).
When I got back home, I found out that the base of the Presta valve was torn. Thus, I replaced it with my spare tube. The next day, I bought another spare tube.
The following weekend, I noticed the rear tire's flat. The culprit's the same. So, I had to replace it with the new tube. But, while pumping it, it exploded. Darn!
I tried to buy tubes; but, they're out of stocks from well known bike shops I inquired from - Knobbies, All Terra, Bikezilla, Iron Bike, Sabak and Bike Town.