Standard, large 850/80R38 tires (rear singles)
require a low 17 psi (117.2 kPa) inflation pressure, even when operating fully loaded. (Optional 710/70R42 rear duals (12 psi) are available.) Compaction is minimal allowing farmers to continue to fill the compartments even in wetter seeding conditions. The 81" tire diameter minimizes rolling resistance. Optional brakes
are also available for the 7700 Air Seeder.