In reply to eastvanbike, I have ridden with mtn bike SPD-type shoes using Campagnolo pedals with toe clips. One problem is that the toe section on most mtn SPD shoes is pretty wide compared to road racing or touring shoes, and the sole is very thick even at the tip of the shoe. Also, the bottom of the shoe isn't smooth, but either heavily or slightly lugged. This makes it hard to flip up the pedal and get the foot in. Also, the shoe is very wide at the sole, so if you're going to use them with toe-clipped pedals, you need a wider platform than a Campy-style quill pedal (would work better with MKS touring pedals, in my opinion). All in all, not really practical. But on the other hand, a touring type SPD shoe is very usable with toe clips.