A sound of metal on pavement

I"m turning around, my car is almost silent, windows down. I can hear this grating sound of metal on pavement. Almost like an inner city Amish buggy I suppose, as a metal wheel scrapes along down the street. Here comes a guy on a bike, his rear wheel is missing a tire. I couldn't resist taking a picture of him after he passed. I figure taking a picture without his face will protect his identity. It was one of those magic moments in photographing decay. I wish the focus was a bit better.