Is there a noticable performance different between the SPD and the SPD SL systems? I've got SPD SLs on my current bike, but some of the touring I do required quite a lot of walking, so I was thinking of getting some SPD pedals so I could use shoes that were easier to walk in.
My current shoes are racing shoes - exposed cleats - but they will take SPD cleats in it. So if I swap them over, will the ride be particualrily different? Or should I keep them SPD SL and just swap over the pedals whenever I want to use them (as I find them very comfortable with the rigid sole).