A light bike doesn't replace good fitness.
Moderator: Moderator Team
I have the same issue which during bad weather I ride rollers. From someone following me in a time trial and group rides I know that I ride slightly bowlegged. When riding my bike gently rocks back and forth as it does when I'm on my rollers. When locked into a trainer the bike cannot rock so that stress goes right to my knees causing achy knees. Video tape or have a friend watch you from behind when you ride to see if you slightly rock when you ride. You could have the same issue.