Somewhere on this board a person was complaining of Knee Pain. Everyone was very helpfull but i noticed that no one mentioned ITBS (ileo-tibial-band-syndrome) this very painful condtion is common in runners but cyclists too. Pain to the upper outer (lateral knee). I had this problem 2 years ago on a ride and mistakenly thought I could ride through it which was a very very dumb thing to do. I cost me an entire month of cycling. If anyone has this pain THAT REALLY shows up walking DOWN (not up) stairs then may I suggest a very helpful website. Just type Ilieo tibial band syndrome int he google search it is an awesome website dedicated to this condition alone. i NEVER ride now without doing the ITB stretch. It has totally cured my problem. And this problem nearly ended my cycling life.
Try this link!!