trescojones

Tour de france winners tend to have a long femur compared to tibia, a higher than average proportion of slow twitch/red muscle fiber, a predisposition to large heart volume and lung stroke capacity among other general features.
When elite 100m sprinters line up at the olympics, commentators often remark that they are predominantly of african heritage, and they seem to have opposite physiological features in these areas to elite road cyclists. That isnt to say that there aren't other sectors of populations with african heritage that can also produce large enough proportions of people with these features but who knows. Given the Kenyan Ethiopian, and north African history in track endurance events it does make me wonder, maybe a super rider is more likely to come from one of these places. Another essential in elite road cycling development seems to be access to big hills or mountains because they must play a developmental role. People evolved to have slightly different population features according to whatever their ancestors had to do to get food, and to make a sweeping generalization I'd say great cyclists mostly come from where there are mountains and a good power to weight ratio is required to get by. Black and white is often dominated by an american paradigm, people seem to be very touchy about caucasians actually being really good physiologically at anything. Its a spectrum anyway, in north africa people are closer to being like europeans, and caucasians broadly include middle eastern and north asian populations anyway.