Originally Posted by
Duragrouch
(above) Not challenging you either. It's just always good to know reasons and rationale for things. If there's a reason why that BB height is not fast, good to listen and evaluate.
But it has no bearing (no pun intended) of the speed of the bike. The wattage expended from the rider is the biggest factor. Then the efficiency of the machine he is sitting on. And the next factor is the rotational weight of the wheels.
I have a Tern Verge X18. The front wheel SPINS for like 13 minutes. Basically frictionless. You get a cheap bike and spin the front wheel. You will be lucky to get 2 minutes.
Quality bearings hubs. Rotational weight. And the overall weight and fitness of the rider determine speed. Not how high the bottom bracket is off the ground. What is this guy smoking?