I seem to have quad muscle imbalance.
I'm not sure how "properly" built cycling quads are usually proportioned, but it seems that mine are a bit out of. My inner quad is noticeably less built than the middle and outer muscles (Vastus Medialis is less built than my Vastus Lateralis and Vastus Intermedius/Rectus Femoris). I know that the inner quad muscle is smaller than the rest, so maybe I'm overreacting. I'm not noticing any power issues, it just seems a bit odd.
Is this bad? Should (can) I work on this at the gym? Does this have anything to do with my knee pain/tightness on 40+ mile rides? Does anyone have any information about this?