Thanks for the input. I think most of my problem will be solved with new cleats and pedals. I think my shoes are also pretty crappy. I'll give it a try, hopefully soon before my toes fall off.
Regarding the etiology of numbness, my understanding is that there are 2 primary causes for it. First is by direct pressure to the interdigital nerves on the bottom of the foot. Second possible cause would be an overpronating mid and fore foot. During the push phase of the pedal stroke, if the forefoot overpronates, you get excessive approximation and shearing forces at the heads of the metatarsals. This can cause extra pressure on the interdigital nerves as they pass between the metatarsals into the toes. This can be aided by either a scaphoid pad at the medial arch or a full-contact custom foot orthotic to control the amount of pronation.
Other possible cause could be bulging intervertebral disk or sciatic nerve impingement on the L5 or S1 nerves. Much less common, imo.
For me, I have a pretty neutral foot type, and typically don't experience overpronating symptoms. So I think my problems are mostly related to force/pressure distribution.
So I guess creeksters not the only one in the pontificating mood.
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