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|Titan Wheels, Tires & Brakes Technical discussion about the wheels, tires, brakes, etc.|
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NorCal 4x4 (08-21-2009)
And that sounds right to me.
I run the stock Rugged Trails at 40 and bump to 44 for towing the car hauler.
2004 SE Crew, Big Tow, Off Road 4x4 w/E-LOCK® Born 05/18/04 in the USA PRGproducts: Radflo c.o. w/PRG 1" spacers and UCAs, PRG endlinks, street bars, shackles, and Radflo rears. Grillcraft mesh grill; Lapco Calipers from Frozen Rotors; Hankook ATm RF10 LT295/70R17E; Pinch Weld Mod
When I was early at truck driving, I was asking an experienced diesel mechanic about sliding the fifth wheel and a trailer's tandem axle for weight distribution. The discussion strayed to discussing retreads then PSI. To put it simply, he said the only way to increase PSI is to add air and the only way to reduce it is to remove air. He said it's the volume of air inside the tire that determines the PSI. I asked about a tire squatting. He said, yea it's squatting flatter on the bottom but it's also bowing out wider somewhere else so the total volume is still the same. Bottom line, unless there is air being added into the tire or the total allowable volume space that it can occupy is being reduced, the total PSI remains constant regardless of the weight set on top. The only thing that changes with a changed shape are the areas where the stress on the container (tire) are relaxed while others are increased. If 43-psi is the pressure required to hold the tire in its rigid shape then the PSI will not change.
So, what about a blowout from overloading?? If you have a P-rated tire for example that's aired to 35-psi then overloaded so the sidewalls are about to burst and put a pressure guage to the tire, the total PSI will still be at 35-psi. The difference is the pressure points where the flattened tread area has been relaxed which requires another area to take over the load (like the sidewalls) and the weakest area is the most flexible so as the pressure pushing against the tread is reduced, the pressure on the sidewall is increased, BUT the total PSI is still at 35-psi. If a tire is rated for 2,000-lbs and 43-psi is documented as enough pressure required to keep the tires shape enough to prevent pressure redistribution then that scenerio will not happen until the max load is exceeded.
|Holy sh!t I run mine anywhere between 32-36 psi lol...40 would cause mine to bounce like no other on the freeway...wonder what I should run them for being a 325/50R22?|
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