Quote Originally Posted by murielalex View Post
What I don't understand is why Look-style pedals are recommended or why the Speedplays are chosen over SPDs, etc.
A lot of what pedal you like is determined by things that vary from person to person, especially knee and foot issues. "Float" in clipless terms means that your foot can move around (within the pedal, not your shoe) while still remaining clipped in. Different amounts of float are good for different people, so I might like SPDs, but the next person thinks they're hard on their knees and so prefers Speedplays (which generally have more float). Another consideration is just ease of clipping in and out. Once I got it down, I found SPDs to be easy to use. Other people have different experiences. Speedplay Light Action are supposed to be easy to get in and out of...some people find them too easy!

Another reason why "roadies" don't like SPDs (generally) is because of the small contact area--long periods pedaling means that that small area is going to put pressure on your foot and it's probably going to hurt. That's why Look-type pedals are preferred--it distributes that pressure over a wider area.