I am right in the published specs for medium size, but I have the wrong body type. I’m thin, but shorter and compact, not tall and string-beany.

I got two Medium Race jerseys from different manufacturers. One measured 17.5” across the chest, and another 19”. The larger one was comfy around the chest, but both were too tight under the armpits. When I took some measurements they both measured the same from the armpit to the center of the back collar, 12”. It was obvious that the 12” measurement was the problem, not the overall size. I could probably find a large, hopefully with lower armpits, but it would also be longer overall, which is a problem, especially with a full zipper bunching up.

I’m just not built like Chris Froome. I don’t have a lot of weight to loose, especially around the torso, and my shoulders aren’t going to get any smaller. I did some googling, and discovered that the models you see wearing mediums are usually 6’2”, so there’s no way it’s going to fit someone 5” shorter. 5’9” is supposed to be average.