Originally Posted by BM OLIVER
The answer to your problem is to see a chiropractor, preferably someone with cycling knowledge. I struggled with this problem for 2 years after getting a road bike and the chiro sorted me out in 20 minutes. Maybe contact a cycling club to find a recommended chiropractor.
My experience too. Leg length differences can be actual (like one leg really is shorther) or effective (caused my a muscle/connective tissue balance or a misaligned spine). Your cure could be anything from PT, an alignment, or corrective inserts/shims.