I just bought my first pair of clipless shoes and I think I may need wedges. They are spd style. I had knee surgery on my rt knee years back and I belive my rt leg may be a little shorter as a result of injury. I know I have pretty flat feet as well. I can tell my rt knee is not tracking straight and I feel some pain on the top outside of knee. I plan on putting in arch supports for flat feet and I think I've read that wedges will help with knee pain. I just don't know how to go about it. Also, I do plan on getting a bike fit in the future but can't swing it at the moment. Thanks.