[填空题]
Calculate the moment of inertia of a bicycle (gm, t/fxu)i)hlho6 j whe(s wixgdk( -x5h-,wfvl;x)54ii ce 0f9mm gtnel 66.7 cm in diameter. The rim and tire have a combined mass of 1.25 k9xhm( wflkt5(--x;d fgg0)e v4x ,5cn iisimw g. The mass of the hub can be ignored (why?). $kg \cdot m^2$