I feel your pain. I too am having knee problems (feels like the pain goes right under my knee cap). I posted previously about it and recieved some exellent ideas, including the plum bob adjustment. I thought about just trying to ride through the pain, but decided that I enjoy this sport too much to take that chance. I have made an appointment with an ortho surg. that rides a road bike all over the world (a guy my mother in law works for luckily enough). Hopefully he will tell me that I can keep riding without tearing my knee up, but I want him to tell me that. In the mean time, I'm taking several peoples suggestions to take my bike to the LBS to let them fit me on my bike. 1 or 2 mm adjustments are easy to get wrong I would think, and would prefer to leave this up to the professionals.