5.50×16 ST-1 F-2 Farm Tractor Tube Type Pneumatic Tires & Tubes. 5.50-16 6 PLY T157 3-Rib TT Set (Tires + Tubes). ONE Set of 2 Tires and 2 Tubes. Enter 1 in quantity box for 2 tires + 2 tubes. If you need 4 Tires + 4 Tubes just enter 2 in quantity Box.