I'm six foot but I ride a 56cm frame. Recently I've been thinking about 54cm frames.

Reason is because I feel like I have a short upper body and a long lower body, thus my torso length is more in line with a shorter person and my height is a result of my leg length. When I rode a 58cm frame I always felt like I was reaching too far to get to the handlebars. 56cm does feel a lot better.

Anyways, is it common for the recommendations to be off due to different body types?