I have one leg significantly shorter than the other as a result from a car accident. My street shoes, dress shoes, boots, etc have been altered with the necessary 3/4" added to the sole, with good, acceptable results. My intentions are to do a cross country supported tour and being on a bike all day, peddling worries me to think that it might throw my back out of wack. I have never spent an entire day let alone many days in a row on a bike, so I am starting my training now. Am I over thinking this, or should I get cycling shoes that are/can be altered and who can custom make these so that I can attach cleats?