There is a pretty big overlap in body proportions of people no matter how they have developed, male or female, and there are also differences in the development of trans people depending on when they started hormones. There are cisgender women out there with a natural born advantage over other women, and there are transgender women out there without those same advantages. If you want to create "body proportion" classes in cycling, great, but there is no evidence to suggest that transgender women should have their own division. 

You're not looking at evidence; you're making assumptions and straw men. The scientific evidence backs trans women being allowed to compete with other women. I don't think it's any coincidence that the same people claiming to not understand or to have a problem with transgender people are the same ones who want to exclude them from sports. You yourself mentioned in another post you would never get it and essentially admitted to not researching the topic.