I went through some problems with numb feet (mainly in the middle toes) with bike shoes and with running shoes, too. Several people on these boards made some good suggestions - make sure your bike shoe has a stiff sole and make sure the shoe isn't tied too tight. My bike shoes do have pretty stiff soles so I tried loosening the straps a little, and sometimes a little more about 20 minutes or so into a ride, and that helped a lot. Also, I switched to a running shoe with a slightly bigger toe box and have been tying them a little less tight and that's done the trick with running as well.--

Deb