[填空题]
Calculate the moment cfy9:;j/zsrgqnf+q 7 ,qe zj7of ia/*y bst2rxd)4ll epfkok*;/nertia of a bicycle wheel 66.7 cm in diameter. The rim and tire have a combined mass of 1yk*x*olpt ;b/d)el far 4sk 2/.25 kg. The mass of the hub can be ignored (why?). $kg \cdot m^2$