Hello everyone! First of all, I'd like to qualify this post by saying I know very little about bikes!
The bike: Schwinn Varsity Road Bike 1970ish
The problem: Yesterday, I had a flat so I replaced the rear tube and tire. It was the first time I had done this on my own. After riding my bike to work today, I assumed I had performed the tire change just fine! Anyway, after work today, I unlocked my bike and started to ride home. 10 seconds into the ride, my rear wheel began to tighten, and eventually stopped spinning altogether. It felt as if I was braking... which I was not. I first checked to see if the tire was rubbing against the breaks or something else, it was not.
Since the bike would not move forward, I tried moving it backwards. As I did this, I could feel the back wheel loosening, and then it felt like it was spinning normally again... I tried riding once more, but the same thing occurred. The next few miles home was one miserable backwards bike-walk home...
On the walk home, I found that after walking it backwards for a while, I could walk it forward for a few minutes before it would tighten again. If I tried riding it forward, t would tighten and stop within 5 seconds.
Any idea what could be causing this? All opinions and advice is appreciated!