I went out for a little ride this evening. This was in the immediate neighborhood which is very hilly. I had to stop and walk a couple of hills, but did pretty well. At the end of the ride, about 1/2 mile from home, it suddenly got very hard to pedal. It was up a little hill, and just too hard to ride, so I stopped to rest. I smelled something burning, but could not see anything that looked hot. I felt the brakes, and they were not hot. I could not pedal backwards to get the pedal where I wanted to start off again. That's when I realized that something was broken. The rear hub was moving freely when I pushed the bike along beside me, and the chains were on the sprockets, but it was extremely hard to pedal forward, and impossible to spin the pedals backwards. I don't know what is wrong with it. I walked the level parts, and coasted it down the hill to the house. I did not see anything that looked obviously out of place or broken. Any ideas? I am going to take a closer look at it tomorrow, and if I can't see anything, I will take it to the local bike shop.