Okay. tried the wheel rolling thing.
When I rotate the front tire, I hear some scrapping, as if some metal part was rubbing against another. None-the-less, it still rotates pretty well.
When I rotate the rear tire, I don't hear any noise, buy the wheel is much heavier and does not spin as freely as the front tire.
When riding, if I roll of the throttle with the clutch fully disengaged, the vehical will slow smoothly without any abrupt decelleration.