Originally Posted by
genec
Shimano
PD-M647 Pedals (PD-M647)
I have a pair of these on my main commuter bike, and they are by far the most comfy pedal that I've ever used when wearing my SPD shoes. The big cage surrounding the SPD mechanism gives nice even support while you're clipped in and virtually eliminates hot spots for me.
Using regular shoes with them is another story. Wearing regular shoes with these pedals transforms them into some sort of bicycle-based torture device. The slight bulge of the SPD mechanism in the center of the pedal makes your foot roll over enough that it feels like your foot will slide off of the side of the pedal. That causes you to tense up your feet and legs to try to stay on the pedals. I rode mine about 10 miles like this, and I had cramps and sore legs into the next day.
So:
with SPD shoes = great
without SPD shoes = pain