How do I calculate the torque of precession for a spinning wheel?

[Webbd050]

Is it just equal to the external torque acting on the spinning wheel?

 

[Simon Bridge]

What are you calling "the torque of precession"?
http://hyperphysics.phy-astr.gsu.edu/hbase/gyr.html
http://physics-animations.com/Physics/English/gyro_txt.htm

 

[Webbd050]

Im not sure of the actual name but a spinning object has a stabilising effect such as with the bike wheel experiment. How would i calculate the force required to overcome this stabilising ?