TM 10-3930-669-20 CHAPTER 12 WHEEL MAINTENANCE Para Contents Page 12-1 Introduction............................................................................................................................................... 12-1 12-2 Wheel/Tire Replacement .......................................................................................................................... 12-2 12-1.  INTRODUCTION. This chapter contains maintenance instructions for removing and replacing wheel and tire components authorized by the Maintenance Allocation Chart (MAC) at the Unit Maintenance level. 12-1