I had my third flat in two weeks yesterday on the ride home. I ended up walking the last 4 miles of the 9 mile ride because I didn't want to waste another tube and didn't feel like messing with changing it. I had also left my cell phone at home that morning. One guy saw me walking and offered a ride but I was already about a quarter mile of home. I'm going to buy a new tire. Bad day over all. Hopefully next week will be better.