Federal supply schedule FSC group. 26. Tires and tubers pt. 2?(formerly class 8, pt. 2). FSC class 2610, Tires and tubes, pneumatic, except aircraft, FSC class 2630. Tires, solid and cushion. FSC class 2640. Valves and valve cores, Jan. 1-Dec. 31, 1960;?prepared by National Buying Division].