Lowest Air Pressure

[PhatF350]

what is the lowest air pressure we can run in the tires before tripping the TPMS without having anything done to the truck from ford.

[ups 6.0]

I think 25 psi.

[TRI]

Less air in tires means less miles per tank too.
I heard below 60lbs it goes off.

[DSL_PWR]

In an F350 it is 68 in the rear tires and 58 in the front IIRC.

[mysticblu999]

Pretty sure its less than 50 lmao

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[factoryflood]

I'm running 65psi on all 4 tires when I'm not towing in my '12F350 ccsb srw and don't have any tpms warnings. When I tow I bump my rear tires up to 75-80psi depending on the weight I'm hauling, but as soon as I unhitch I drop my tires right back down.

I have found that I get less of that "bucking/bouncing" feeling on concrete roads with the lower tire pressures when unloaded.

[factoryflood]

I'm running 65psi on all 4 tires when I'm not towing in my '12F350 ccsb srw and don't have any tpms warnings. When I tow I bump my rear tires up to 75-80psi depending on the weight I'm hauling, but as soon as I unhitch I drop my tires right back down.

I have found that I get less of that "bucking/bouncing" feeling on concrete roads with the lower tire pressures when unloaded.

[Jbrozovic]

My Han****'s max out at 60 psi. I had to have the dealer reset the sensors to make them go off.

[RCF]

Originally Posted by mysticblu999

Pretty sure its less than 50 lmao

Uh, nope - at least if it's working the way it's supposed to.

Dealer reset my TPMS setting to 65psi in rears, the same as front, as I dropped mine to 60psi and the alert was constantly on. They told me there was a 15% low/high trigger for the alert. So I tested it -

56psi (14% low) - no alert (drove this way for abt 100 miles)
54psi (17% low) - alert came on within 10 miles of driving after lowering pressure from 56psi to 54psi

So I'd say that 15% is accurate. I'm gonna test the high side - I'll air 'em up to 76psi (17% high, so alert should come on) prior to going to pick up our TT tomorrow for our trip. I'll report back my findings.