Hi , nice forum you have here. Thought I may add something. I'm a runner, hurt my right knee 18months ago, and pain just did not want to go away. Last October got on my bike, and guess what, after 2-3 40-60 km rides, pain subsided, after a month it was bearable. I now cycle a few times a week (60-80mins weekdays), 2-4 hours weekend, purely to strengthen the knee. What I am trying to say, is that for me a ride's definitely + sign, for prior knee pain. Exercise the muscles around without the pressure of running.