But a big gear pushed by someone with big legs at 'x' rpm is not necessarily faster than someone with weedy legs spinning a lower gear at 'x*1.5' rpm - as is my experience being a weedy leg cyclist who has won open TTs on 86" fixedBigger legs give you the potential to push a higher gear than someone with weedy legs. The speed and endurance bit is down to fitness level.

It's in the mind not the body.
If you believe you can do it - stop believing it all falls apartWell, to be fair, it is mostly in the body - just not all in the legs.
. I had to speed up to catch him to see what was going on. He must have cycled all the way up it at around 20/25mph ish as I do not recall dropping below 28 mph. I was in such awe I stayed behind for the last 1/2 of the hill, baffled at how this guy chap was tearing up the hill, without any fellow car drivers getting impatient. I have never seen anything like it before or since! The rider was a ripped bodybuilder (not a heavy weight Ronnie Coleman but more like a middle weight), massive shredded legs on show, muscles bulging out of the lycra.
Makes you wonder if the guy in the pic I posted above (Rohan Dennis, world TT champ) could even stay with an awesome guy like that![]()
But a big gear pushed by someone with big legs at 'x' rpm is not necessarily faster than someone with weedy legs spinning a lower gear at 'x*1.5' rpm - as is my experience being a weedy leg cyclist who has won open TTs on 86" fixed![]()
The first part of the sentence may be true, although there are a lot of other factors to take into account in determining blood volume; however the second part is wrong....lactic acid build up is metabolic not a function of blood volume. It depends on so many other factors: fitness, genetic issues, lung capacity etcSomeone with big legs will also have more blood volume and it's quite possible they will be more resistant to lactic acid build up because of this.
I don't know if weight / build play any part in cycling ability , away from the top end of the sport.

Someone with big legs will also have more blood volume and it's quite possible they will be more resistant to lactic acid build up because of this.