I have arthritis in both knees, my orthopedist said I have a 60 year old's knees, but I have never had this type of pain before.

At mile 60 in the century I felt posterior tension in my right knee. I am not sure what it says about the fit of my bike to have one knee hurt and not the other. It is still sore 4 days later but improving steadily although I have not been back on my bike.