How Does Angular Momentum Apply to Earth and Spinning Bike Wheels?

[jbriggs444]

"the orbital angular momentum to be thus included will be zero if the other axis is at rest w.r.t. the spin axis."

If you clarify that by "spin axis" you mean "center of mass" then I will agree.

 

[kuruman]

If you clarify that by "spin axis" you mean "center of mass" then I will agree.

Yes, of course. I specified as much in post #4 and in other posts where I wrote $I_{\text{cm}}~\vec\omega$ for the spin angular momentum in equations. I confess I got lazy and abbreviated "spin angular momentum about an axis that goes through the CM" to just "spin angular momentum" in sentences.