Tire experts PSI discussion

[Badhabit]

So I got a screaming deal on some BF Goodrich KO2's 265/75/16E. The shop aired the fronts to 50psi and the rear to 80psi. I hardly ever haul anything in the bed but tow a boat.

Years ago I found a tire pressure formula and want to know if it's still relavent.
Max load per tire at 80PSI  and is 3415 max weight times 4 is 13660lbs. The truck weighs in at 7700 with me in it. So 7700 divided by 13660 is 56.3% so round up to 57%. 57% times 80PSI gives me 45.6PSI or round up to 46PSI on all 4.
Anyone use this formula??? or should I keep all 4 at 50 PSI?

[jackelope]

What year is it and does it have sensors?

[KFhunter]

what truck? What ply?   not sure if you got the 6 or 10 ply KO2

80 sounds like a crap load of air if you never haul anything.


I'd put all at four at the same air pressure, 40 in the winter 50 in the summer, easier to rotate.

[hunter399]

Tire shops always over inflat .
Tire wears out faster that way .Should say right on tire what psi should be.
I always keep all four the same ,unless hauling then 10-15 pounds more in the rear but that's just me.

[Crunchy]

My Ram 2500 are inflated to 70 in front and 80 in  the rears.  Any way of getting around the sensors.  I do not tow much in the winter, and like to drop them down to 55 front and 65 rears.

[KFhunter]

My Ram 2500 are inflated to 70 in front and 80 in  the rears.  Any way of getting around the sensors.  I do not tow much in the winter, and like to drop them down to 55 front and 65 rears.

electrical tape over the dash light?
fake sensors in the glove box?
TPMS bypass tool?  (sold on ebay, switch on and off)

[jackelope]

There’s no legal way for a shop to modify the tire pressure monitor system. There might be some aftermarket tuner thing. The tires should be the correct tires for the truck, and the correct tires for the truck would be inflated to what the door placard calls for per the weight capacity of the truck. You can run them up or run them down but either way would/could turn the tpms light on.  If the tire shop overinflated your tires to make them wear out faster(never heard of that), it again would turn the light on.

[davef]

Tpms sensors are set to a certain pressure and that setting can be adjusted and re set. So that's not a biggie. Psi is listed on the tires but that's just the hot and cold max pressures. Your supposed to go off the door like was commented. Assuming your using the correct rating tires. Otherwise I'd say just do what years of driving and common knowledge have taught you. If they were 80 max I'd run them at 60 all around and adjust from there depending on what your doing that trip.

[GryphonHunter]

From my previous experience as a tire tech, I can tell you DaveF is spot on.

Remember that under inflated tires build up heat which leads to catostrophic failure of the tire.  @badhabit I would not trust that formula at all. 45psi seems pretty low for a 3/4 or 1 ton truck.

[Badhabit]

06 GMC 2500HD Crewcab 4x4 with the duramax. No sensors 10 Ply load range E.

[AWS]

I air mine up to the manufacture specs, there is a sticker on the door of my van.  55 front 80 rear and my tires seem to last a long time, I don't rotate as I have highway tires on the front and aggressive snows on the posi rear.

[Special T]

I have never heard of that formula before. I am curious where it originated. Off road dirt work tires have PSI, Load, Speed, Distance tables to match each tire for maximum performance. manufactures do not post this kind of info typically for DOT rated tires because of liability reasons.

That 50 psi is fine for running around empty, but you have to remember to bump it up some for longer distance, summertime travel and or if there is a load. GryphonHunter is correct, heat buildup kills tires

[aaronoto]

I've just worn out my first set of E rated KO2's, I ran them at 50psi all around when not hauling.  I got great life out of them and very even wear at that pressure.  Truck is a 2012 Tundra. 

[Westside88]

Tpms sensors are set to a certain pressure and that setting can be adjusted and re set. So that's not a biggie. Psi is listed on the tires but that's just the hot and cold max pressures. Your supposed to go off the door like was commented. Assuming your using the correct rating tires. Otherwise I'd say just do what years of driving and common knowledge have taught you. If they were 80 max I'd run them at 60 all around and adjust from there depending on what your doing that trip.

I’ve been told the setpoint for TPMS can be adjusted, but have never actually found anyone who can or will do it. Several shops have said it’s not legal for them to change the factory settings. If that’s true there must be a lot of super duty trucks with the warning light on. Anyone know where you could get it adjusted if it is an option?

[jackelope]

This isn’t saying much, but I’ve never even heard of being able to adjust pressure settings. Maybe with an aftermarket tuner but I doubt any shop would do it. Since 2008 sensors are a federal mandate in passenger vehicles up to a certain weight. I assume tampering with them is frowned upon.