I found out after researching IT BAND syndrome & doing some glute exercises. My right side gluteus medius is noticeably weaker than the other while performing the exercises. It seems to be the source of my knee trouble/it band acting up. Im doing physical therapy on it. Was currently training for for a sub 4 hour marathon but thats been halted because of it.

FWIW I do several crit races & lots of climbing on the bike every month but never noticed I had a weak gluteus medius. The more I learn about tight hip flexors and imbalance problems the more I regret cycling so many years while neglecting to do other types of exercise & different stretching.