Originally Posted by
carleton
Plus road systems allow you to adjust the angle of your foot, too. Most (if not all) 2-bolt MTB systems don't allow for this.
What?
I take it you've never had a loose SPD cleat. Not as much as a three bolt road cleat if you're crazy pidgeon toed or something, I guess, but plenty in my experience for just about everyone. Back in the days of shoe anchors with just two threaded holes (nowadays, it's 4) you could get damn near 45 degrees in both directions there was so much slop. I had an old pair of specialized shoes where the cleat just wouldn't bite as soon as a drop of water got on them, so I'd have to wrench my foot to a crazy angle to get out.
There is also a side to side adjustment on two bolt cleats (crank brothers' cheaper cleats are a notable exception), it's just that this movement is the first thing to gum up.