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we did the simpson in a hg holden wagon, over all the dunes and all, no 4wd, did have A/t tyres, and all the 4wd'ers kept saying let more air out of ya tyres, we made over all but two dunes. Mind you we were rear of field and followed after everyone else had already loosen the tracks. I think we run about 25 psi from memory.
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ok i would like to add that with the new bfmuddies with their 33% stronger side walls means that they don't ballon as well and i found i had to go down to 10psi and even a little lower. hey i thought my tire was a litttle low on air onday turns out it had no air but still looked 3/4 inflated. i am just stating that some tires do need to go lower than 16psi just start at 16 and work down. but remember the lower u go take it easy u don't want to roll of your beads.
ok i would like to add that with the new bfmuddies with their 33% stronger side walls means that they don't ballon as well and i found i had to go down to 10psi and even a little lower. hey i thought my tire was a litttle low on air onday turns out it had no air but still looked 3/4 inflated. i am just stating that some tires do need to go lower than 16psi just start at 16 and work down. but remember the lower u go take it easy u don't want to roll of your beads.
Yep depends on your tires,ie width,diameter,tread pattern,compound , ply rating, all play a big part on how it performs on various terrains at different pressures.Also vehicle weight and suspension come into the equation.