If your Shimano pedals use the SH-51 cleat, then make sure you get an SPD "knock-off" pedal (they're almost all made by Wellgo) that uses the Wellgo 98A cleat, they're completely compatible with one another...........One of Nashbar's SPD-type replacement cleats for their Nashbar pedals has a Nashbar part number, but on the back it's stamped 98A. But you may have to ask their tech dept. to make sure of which pedals use the 98A, there are a lot of similar, but not quite similar enough to work well, "knock-offs" out there. I've had excellent luck with Wellgo MG-8's for road riding, check them out on Price Point's site (and they use the 98A cleat).

Here's a link: http://www.pricepoint.com/detail/128...oad-Pedals.htm