Long post ahead, beware..
Ok, I'm no expert on the matter, BUT seeing as how a lot of cars these days use aerodynamic forces to generate downforce on the tires as the speed increases and thus increase stability & cornering ability, I don't see why it shouldn't be used on bikes as well...
So, here's a few pros & cons for it that I've thought of :
Cons:
1. Difficult to properly implement
2. Weight increase of the bike
3. Weird looking at for the first few designs..
Pros:
1. Extra traction when cornering as speed increases
2. Added stability in a straight line as speed increases
3. Possible increase in breaking forces when required
I thought of small wings on the bike. Trouble is, you'd have to mount them on the wheels in order for them to be effective (they would not have any effect on the suspension behavior this way and the forces generated could easily be distributed to the tire). On top of that, you'd have to somehow make them tilt so that they would always be parallel to the ground. That way, they would not generate lateral forces when the bike is tilted over, but only downforces. You could use them when braking also, as one of the few other forces that can be used for braking other then the friction ones from the tires are aerodynamic ones (which you generate as you position yourself higher in the seat and act like a parachute). You the wings would change their angle like an aileron for a car, which would produce either supplemental drag or extra downforce on the tires..
I realize that it would be hard to implement (probably VERY hard), as it requires some sort of motor force at the wheel and some sort of pivoting mechanism which might be very complex, as it is required to withstand the forces generated.. then again the motor force could be transmitted from some other source.
Anyway, this is why we've got engineers in the world, to solve these kind of problems, right? I just think it would be great to use something like this..
