I guess the whole "cycle world" is under the spotlight now due to the last few years - and yes there are alot on - but from this pic you can not tell - 1. his legs are not even that big (and yes I know they are not going for size) and 2. think about the blood flow smashing through their legs in some of the sections which would of course cause a huge amount of vascularity + combine that with these athletes being overlly lean then the pic above totally makes sense.
Its very easy for people to jump on the steroid bandwagon - and def around sports like cycling - but far out....come on people! lol
And at the end of the day who even cares lol