Went for my ride this morning. Went up the last big hill when I felt that familiar thunk, pedal, pedal, thunk, pedal, pedal, thunk. It wasn't a flat tire, it was the chain again. I stopped, checked and, sure enough, the chain had screwed up (bent and frozen) links like the one it replaced just last week. The only things I did differently this week were not to use the smallest gear in front (there are three) with the smallest gear in back, and I shifted more throughout the ride. Piece of crap bike. I can't complain about it, though, since i was a freebie from a neighbor a couple of years ago. Too bad, too, because I was really flying today.
Looks like I will have to move up my plan to buy a new bike in November.