I'm pretty new to road cycling. Help me understand. What is the exact difference between a road and moutain bike shoe/pedal? I have Wellgoes (sp?) that came on my new Bianchi Giro road bike. They are double sided SPD type pedals. I happen to have a pair of specialized shoes that I bought 5 years ago when I got my Gary Fisher mountain bike. These shoes have/had a rubber flap that I cut off to expose the screws for the SPD cleats. I couldn't afford new shoes so I use these on my road bike. I realize they are heavier, but I now looooove the SPD set up. I want to move my Welgoes to my GF (it just has platforms with a cage), and I want to get new pedals for my Bianchi. I was wanting to get double sided SPD type pedals, and some day I will buy better road shoes. But what is the real difference? Are double sided SPDs not considered road worthy? I saw the Look pedals and think I would prefer to stick with one type for both bikes.

Thanks,

Steve