Originally Posted by
livedarklions
You just illustrated the problem with analogy between moto and velo. Somebody forgot to give this guy the memo about needing inputs into the handlebars:
Those inputs are definitely imperceptible, is he doing it with his breath?
Nope. He's doing it with his hips, more or less.
The biggest difference between moto and velo, as I've said, is that center of mass, and the rider's proportion of that mass is very different. On velo, the riders' mass is several times that of the bike, and you're able to affect more control over the bike using weight shifts and counter-shifts to control both the lean of the bike, and the CG of the whole system (bike+rider) without a whole lot of extra movement.
I'm not saying everybody can ride any bicycle with no hands, but it's not an uncommon thing.
It is really, really difficult to make a 500# moto change direction quickly and predictably without input to the bars. It's too heavy, and the CG is too low for just the rider shifting their weight to have the effect it does on a bicycle.