I've read this over and over but don't believe it is true for the vast majority of people. For those with preexisting conditions maybe but one would have to have the pedals adjusted really poorly to do damage.

Speedplay used to trumpet knee safety as a reason for their free floating design but many people find that holding their feet in a narrow range of motion helps with proper form when tired at the end of a long ride. I've abandoned free floating pedals altogether for this reason and enjoy the narrow 4° range of motion with SPD. My speedplay zero pedals are adjusted to a very narrow range of motion as well.

Never met anyone who had knee problems due to clipless pedals. I'm sure they are out there but I just don't believe that many have found them to be problematic in terms of knees.


-Tim-