My problem is somewhat hard to explain. Today, I took my back tire off to do some cleaning and put it back on. I had my bike hooked up on my trainer and I noticed something strange. When I was spinning the pedals with my hand while dripping some oil on the chain, after stopping the spinning motion and letting go of the pedal, the chain continued to spin, but it kept pushing the pedals with it. Normally, when you are pedaling and you stop pedaling, the chain continues to spin but the pedals do not - this is how my bike has always operated. Also, when I pedal backwards, it seems like the chain gets caught and will bunch up. Anyone have any idea what this problem is?