None of the 'blacks are genetically gifted and would dominate cycling too if they weren't so poor' are convincing.
There are thousands of teenage Kenyans studying in the USA and the UK, most of them from the Kenyan middle and upper classes. Occasionally a few of these superhuman athletes would end up on a cycling team and their talent would be obvious.
Also, Chris Froome's family were not exactly wealthy.
He was introduced to cycling by a black in his village, but had to borrow a road bike from a teacher as his mother couldn't afford one :
"Some of the challenges faced by the Kinjah’s Safari Simbaz team, made up of teenage boys and young men from nearby villages, also frustrated young Froome when his single-parent mother introduced him to Kinjah.
Froome had to borrow a road bike from a sympathetic teacher as his mother, living in the servant quarters of a wealthy family in a Nairobi suburb, could not afford a new one."
So Froome didn't have any advantage over his local black Kenyan schoolmates when it came to getting started in cycling. If Africans have an innate advantage then surely it's massively unlikely that a white boy in an African country can become not only that country's only successful cyclist, but one of the greatest ever? It's like saying that white British have a massive genetic advantage to Somalis, and Mo Farah just got lucky.
And to the guy who said that the one successful African cyclist has advantages over the Europeans because he is so light, Chris Froome is the same height and just one pound heavier. Bradley Wiggins is two inches taller and one pound lighter.
Cycling both track and road is a similar sport to endurance running. It's about pumping the legs at a moderate pace over a sustained period of time with a short sprint at the end. These bikes are so ultra-light and efficient that the cyclists that the resistance their legs are meeting is scarcely more than that of a runners legs bouncing off of the track. Runners use their arms more but I doubt very much Kenyans have an advantage there. Yes, uphill requires more powerful legs, but then if Kenyans are at a disadvantage there they should also be at a disadvantage in cross country when in fact they dominate, if anything, even more than on the track. Also the cycling expert here said that the reason the one African succeeded in cycling because he was so good uphill because of his light frame.
Africans are not more inately gifted at distance running, or at least if they are its not much of a difference and can't explain their dominance since EPO and the next generation of peds came out in the late 80s/early 90s.