I'm still a newbie, and some of this discussion is over my head. Can someone clarify for me: I'm assuming that float is how much you can move your foot side to side when clipped in? I had no idea there were so many pedal systems available. I thought I pretty much only got to choose between the SPD and SPD-SL (mtb vs. road), so I went with SPD-SL.

I had an ACL reconstruction and meniscus repair in my rt. knee about 7 years ago and it continues to be problematic under anything less than ideal conditions. When I went clipless I was having some pain in the front of my knee. Moving my saddle forward just a smidgen eliminated this completely by putting less stress on the front of the knee. So this is working for now, but if it changes in the future its good to know there are more options.