Quote Originally Posted by MDHillSlug View Post
I have mtb shoes with spd cleats. When the cleats were brand new I'd hear them crunching on the pavement a little bit but it never did any damage more than create some scratches. Now, I just don't worry about it.

BTW I accidentally found that there are spd covers!
Those are covers for the SPD-SL cleat - Shimano's road cleat -- a bit different than the common mountainbike cleat. It's actually more like a Look cleat.

I have mtb SPD's on my commuter and mtb. I don't bother worrying about covers for those (not that they're available anyway).