Tyre pressures, doing my head in!

[Baytown]

Hi everyone.

Im intimately aware of and practice tyre pressure changes relative to the Off Road surface being traversed, however I’m frustrated over my being unable to work out my Highway pressures, especially for the rear tyres.

Im running 40 psi in my 265/75/16 Wrangler Mud terrains, on my heavy 110. However, the ARB pressure sensors report that tyre pressure rises up to 50 psi in the rear when hot from running.

Ive tried increasing cold pressure to 45 psi but still get an over 6 psi pressure increase when the tyres are hot, especially when towing.

Any suggestions on correct tyre pressure to run?

Thanks.

Ken

[incisor]

Try 50 to start with

What is the tyres nominated max pressure ?

[Tombie]

6 psi on an LT isn’t a problem.

The 4 psi *guideline* is just that.

I wouldn’t sweat it, if the temperature on the TPMS isn’t excessive then don’t worry.

[Eevo]

common. my 40psi cold goes up to 46psi when driving

[Zeros]

I run the tyres on my 110 at 40psi front and rear unloaded. 45-50psi rear loaded. All highway pressures, measured cold. Many 235/85R16 LT / AT tyres run up to max 80psi.

[DiscoMick]

Have you checked the tyre pressures recommended on the door placard? Big difference front to rear.
I'm running 34 front and 45 rear.

[Zeros]

... it all depends on the stiffness of the tyre / sidewalls.

[Tombie]

And how much understeer you’re trying to induce

[justinc]

...and whether or not the vehicle needs a weight loss program...😣

[trout1105]

A lot depends on the ambient temperature, In summer I usually run at 36psi and winter at 40psi with an empty truck.
With a big load on and a boat on the back I just keep it at 40psi winter or summer because with the extra load the tyres heat up regardless of the outside temperature.