So, my new SPD shoes came with these little steel plates. Some shoes I've bought in the past have had them, and some haven't. These shoes come with a thin set and a thicker set.
Are they supposed to go between the sole and the SPD cleat? If so, does anyone use them and why? (I'm genuinely ignorant, and have always bolted my cleats directly to the sole with no problems. In fact the metal cleat "bites" nicely into the plastic sole, with probably wouldn't happen with these).