Situation: I have one leg shorter than the other by 3/4" due to an auto accident. All of my street shoes have been altered to accommodate this discrepancy. Without the modifications, my back and neck go out of alignment immediately, thus causing lots of pain. I cycle quite a bit and have an upcoming tour this year. Typically, I wear street shoes when I ride (hiking boots when I am mountain bike riding or tennis shoes when street riding). On tour, there will be lots of mountains and flats so being clipped in would be advantageous.