I have a 3020 diesel with 18.4-34 bias ply tires on it I'm taking it on a tractorcade on Saturday and wondering how low can I safely set the air pressure for a smooth ride without damaging tires or tubes. The ride is 60 miles. also while I am asking front tires are 11 L 15 SL bias ply how low can I run Those as well.
tire pressure
