robots in disguise
Join Date: Dec 2004
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This probably isn't the answer you want to hear, but since this is the training forum: the gym.
I don't mean to be insensitive -- I've had some knee pain too, on longer rides when my body tired. For me, it had to do with the strength of my quads and, as I fatigued, increasingly poor form. I ride a road bike and a fixed gear, so this may not apply to your (recumbent) situation. I would like to note that I've had no problems on the fixie, because I've never taken it on 5+ hour journeys.
Anyway, without more information, my $.02 is that it has to do (despite what you wrote) with fatigue, probably slightly off form as you get to the top of Twin Peaks and are (momentarily) tired. If you let your legs flail out to the side, that can do it.