MOST PEOPLE DO NOT HAVE A TRUE LEG LENGTH DIFFERENCE

This will be a short and sweet post.
* 93% of the adult population have pelvic malalignment... which causes a functional leg length difference.
* 80% of the adult population pronates which typically causes pelvic malalignment... which causes a functional  lleg length difference.
* nearly 100% bike shops address leg length differences with shims and spacers.
Rather than using shims and spacers to address the majority of these "functional" leg length problems I recommend trying muscle energy technique (MET). So, see your local PT or a someone who understands how to correct for pelvic malalignment. Hey, I know a certain bike fitter who can show clients how to do MET:)
Here is an interesting link regarding pelvic malalignment: 
http://www.atlantotec.com/en/disorders/leg-length-discrepancy-tilted-pelvis-pelvic-obliquity