Originally Posted by MacMan

I was taught that you shouldn't lean too much with the bike. You're not riding a motorcycle which has more mass and a lower center of gravity than you. In bike racing you lean the bike but try to remain more upright so the center of gravity remains more upright - if it falls too much to one side you'll crash. Taking corners at speed is like trying to carve a groove in the road - you're almost trying to push the wheel into the road down through the handlebars.

Originally Posted by Eatadonut

That just plain doesn't work. Merely leaning your body doesn't turn the bike, otherwise I wouldn't be able to do a rolling mount in a straight line. Either the bike has to lean, "curving" the surface of the wheel and causing the bike to turn, or the wheel has to turn.

They might have more traction when vertical, but they have no turning ability.