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I run the same pressures in my Firestone T-831s. Running at 80 psi in the steers stopped my truck from wandering all over the place. Anything much over 50 psi unloaded in the rears will have you catching air over bumps.On my deuce tractor ww with Xl's, I run 80 psi in the front and 50 in the rear duals, they ride nice and are wearing evenly.
Hey Sandy, It's nice to hear from a fellow T-831 owner. Great tires. I'm surprised your outer lugs aren't touching pavement. My dueled F-stones sit dead nuts square on the pavement at 55 psi. Don't know what to say about that. I can tell you that my Ts left some very awesome looking tracks in snow. Brutus and I blasted through snow plow piles as if they weren't even there. Brutus has hydraulic power steering. It's like steering a Toyota Corolla. I just have to remind myself that I'm piloting 6 tons of heavy metal down the road. Hope you are well.I have T-831 Firestones on my truck. I'm happy with 90 in the front and 50 in the rear's in dual configuration. I've been told by a friend who followed me 180 miles each way to a GA Rally that I should consider lowering the rear tire pressure as the outer lugs were not touching the pavement at all. I think I'm ok though as they are wearing nicely and not showing any considerable wear at all.