Thanks. I just found both of these pedals available through REI, and they're most like available elsewhere. REI's website says they have 4 degrees of float. The pedals/cleats are actually for my wife as she needs the float so that her knees don't 'act up'. She uses the Look KEO gray cleats on her road bike, and they have 4.5 degrees of float, so your recommendation should work well for her. Also, either the 520 or 540 pedal is in about the price range we were looking at - will probably go with the 540.