Only stupid knee

pain more often lately. Luckily, I had no problems so far in the race and could, if the pain started during training courses have to take out to go with a higher cadence. Yesterday, however, it was already so far that I had to stop after an hour of spinning left knee because I could barely move. If I'm lucky lags only yesterday in the wrong position, but sits on my bike I've ever not been changed at the position ... or maybe just the new shoes??

I would like to see in any case, my knees are simply! Have something else in the years before the next