is there a wheel hub/bearing maintenance?
like re greasing or replacing bearings in the front hubs?

 

Yes, you have a wheel bearing but it is sealed. Change upon failure.

 

oh! goodie! thanks for replying,
do you happen to know, what are ground for malfunction?

 

I hit a city titty with a low front left & took one out once upon a time.

The impact marred the race that the bearing spun in & made a god awful racket. Either you hear noise or wheel catches fire if it got really bad I guess.

You don't change them unless you have to.

 

broke both rear bearings on my SC speed trials At bonneville salt flats.