I have noticed my right knee feeling the same since I have put my bike onto the trainer. I think it is due to mashing the pedals/using too high of a gear, like you mentioned. Try spinning with less resistance and if the problem continues, make little adjustments to your positioning.



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I teach Spinning and will say the knees could be the fore/aft position. Sometimes even if you are set up right (by yourself, and/or instructor) the seat slider can come slightly loose, and shift during a ride. Simply use your brake to stop your bike mid class, re-check it, and adjust / tighten to the correct position.
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