Towing Tire Pressure (non oem tires)

Hi Tacoma folks,


I’ve got a tire pressure question that I’d appreciate your perspective on.


Truck came with Firestone Destination A/T P265/65R17 110T tires. I’m towing a 4k lb. load on a semi regular basis, so I upgraded to an LT tire, the Geolandar G015 LT265/70RT17. Love this tire, BTW. Quiet on pavement and pretty good on snow/dirt roads.


So, here’s my question.


The geolandar has a max PSI of 80. The Destination has a max PSI of 44. The door of the truck lists a recommended PSI of 29.


What PSI should I be hitting during regular driving? What PSI should I be hitting when towing?


Thanks everyone,


Dan

 

Max pressure thats printed on tire has nothing to do with vehicle, I would run the truck at approx 30psi and see how the rear tires look with your trailer loaded up, you could increase tire pressure till your happy they are not to squished but i would not go over 45 psi, Personally I run my 2nd gens tires at 35psi and have been happy with that.

 

I tow this all over the US. 30 psi in the truck. 40 psi in the trailer. 11 different states with no problems.

 

I'm running 255/60R-18 at 40 psi which are rated at 44 max psi. Ive towed a trailer full of logs and some in the bed.
The real concern is your leaf pack. Too much tongue weight and you will flatten them out.
Check out the Towing bible thread

 

Man, I've spent some time there for sure. I'm below the tongue weight limits, but a good recommendation in any case.

Appreciate the other recommendations as well, but I'm looking for advice on how to estimate a recommended tire pressure.

It's hard to imagine ignoring such a big difference between the max pressure on the two tires (the only recommended pressure I can find anywhere is the max pressure). You guys are suggesting that I take a tire with an 80 max PSI and run it at 30-40 PSI?

Is there some way to estimate or look up a recommended PSI for a specific tire under a specific weight?

Thanks again for your help guys -

 

You are totally missing how max tire pressure works, the max pressure stamped on the sidewall is tire specific regardless of it on a honda civic or a F250, they company who makes the tire doesn't know what vehicles people will put their tires on so they are just giving you a warning that you shouldn't go above X pressure, I seriously doubt that you will find a form that says the firestone destination tires on this make model and year should be at X PSI but different for 20 other vehicles, or for any other tires. Its weird I know but the company who made the vehicle would be able to give you a good suggestion for tire pressure. If you want to fuck it run 80PSI in your tires and have fun with that.