I've been out test riding bikes and all the bikes had platform pedals, for obvious reasons, and they really felt good with the wider platform. I bought a pair and put them on my bike and I can really feel I'm putting out more power. Anyhow I was wonder about the clipless pedals you see, with the wider platforms, but are they really functional. They look like you would be clipped in, but your sole wouldn't be flat on the pedal. Maybe it's just the way I'm looking at them, but I really think they would help me a lot. At the present time I'm using SPD pedals and trying to adjust them everyway that you think you can of adjusting them, I still have a slight pain once in a while. I put the platform pedals on yesterday and pumping pretty hard, for 20 miles my knees didn't bother me a bit. So that's what got me to thinking about the wider clipless pedals. Thanks for any replys.