I thought id find an online chart telling me what pressure to run in the tyres of my air seeder bar.

I looked at the Alliance website because they made them, but didnt find anything.

i looked at Michelins Aust website figuring they likely have an equivelant, but again i didnt find it.

They are 1400 x 20  22 ply conventional.

They are in the centre of a double fold 64 ft bar, so carry a lot of weight when it's folded.. something like 26,500 pounds as near as I can figure.

Anybody can advise.?