muff528 wrote:
Hmmmm.. gotta think about that one. Not suggesting that you're incorrect but
just
wondering how the hub could act on the spindle if the bearing were truly
*frictionless*?!
Something has to push on something at some level.

A 'frictionless' surface can still exert a force normal (at right
angles) to the surface. So you can stand on a frictionless skating
rink and the ice will hold you up. It just won't exert a force
tangential to the surface so you may well slip and fall - at which
point you'll feel considerable force exerted on your body by the
frictionless surface, but it will be normal to that surface..

Similarly, the frictionless bearing can still exert a normal force on
the spindle/axle but it won't exert a torque since that would require a
tangential force.