I run my 39s at 20PSI. People look at me crazy when I tell them this. Plenty of info that bigger tires = less psi.Post #267 10 psi to 25 psi in a minute & 30 to 40 seconds, tested it 5 times. For me there no need for 40 PSI for street use. the bigger the tire the less psi needed, lots of info on the net about this.![]()
But beyond the info. Chalk test for your specific rig tells you exactly what PSI you need. I asked my truck and it spoke to me with chalk and said "yo man I need to be at 20PSI".
My 37s prior liked 24-25psi for my 80. I aired down to 6-15 PSI depending on terrain.
Same 37s and beadlocks were at 16 front and 18 rear PSI on my mini truck crawler. I aired down to 6-12 PSI depending on terrain for the mini truck.
Different weight different load different truck and different PSI. I have not aired down the 39s and only driven 50miles on it so far before I started taking the 80 apart to get it ready for this season. My truck has been on jackstands now for a little over 2 months. I'm hoping by next weekend she will be ready for the season.
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