ickyickyptngzutboing said:
Hey, you could be suffering from Plantar Faciitis--it's inflamation/ripping of the tendon that runs from your heel to forefoot right in the bottom of your arch. If you're experiencing the slight burning and very sharp pains every once in a while you could be suffering from this. Look it up on the web--however, if it is that, it takes a while to heal, not good for mountain biking...
BINGO! That kind of pain is related to your musculature. It's likely not equipment related. The thing about clipping into pedals is that generally it doesn't allow you to move your foot in the pattern you're used to. My guess is you walk on the outside of your foot alot? So the pedaling "pattern" is mechanically correct, but this isn't what your body is used to, so you get pain.
You need to find out more information about your feet - and the feet have several muscle attachements that go right back up into the leg: Soleus, Peroneus, Ant. and Post. Tibialis. These (one or two of them anyway) are the muscles that are likely to be the root cause because they can dictate the pattern of your foot. When all of the muscles are at proper tonicity and length, the mechanics of your foot will be perfect.
So, find someone that can asses this for you - Massage Therapist, Physical Therapist or Podiatrist. Your general practitioner may be able to help too. Chiropactors are also getting into evaluation a person's feet because of the structural alignment associated with the pelvis and spine. I'd advise neuromuscular massage as treatment because it allows you to correct your body instead of buying devices that compensate. But that's your choice.