I hope you don't mind me horning in on your question but I have a foot problem also. My left foot cramps shortly into each and every ride - and it keeps cramping until I'm finished. I've almost had to stop because of this. Sometimes i just have to unclip and move my foot around. Since it happens so quickly I don't think it's an electrolyte issue. Also, I make sure my shoes aren't too tight. I can't move my cleat position - my shoes have two holes to accept the cleat screws and therefore I can't move them. My mtn. bike shoes have slits that will allow me to move the cleats forward or backward...but my road shoes don't. Any thoughts?