RJFabCab

What tire pressures are you guys running when towing under load?

Yes, Lewis, you can chime in, too!

Just picked up an '06 CS Tit Ed and here's the deal:

Tires: Pirelli Rosso N0 275/45 R19 108 XL Y
Cold pressures per the manual: 38/43 f/r partially loaded, 38/50 f/r fully loaded

Inside the driver's door, the recommended cold pressures fully loaded are 39/49 f/r.

The MAX pressure listed on the Pirelli sidewall is 50 psi. Go figure.

With a fairly loaded vehicle and towing around 5000-6000 lbs, what tire pressures are you running?

I'd hate to blow a bead or disintegrate one of the rears...

Renn 951

I pump my rear tires up to 49 psi cold when towing my 951 on a Trailex and that has worked well. I have 18" wheels with the OEM Continentals. You should be fine with 49-50 psi since you aren't exceeeding the Pirelli specified max pressure.

skl

I use 48 in the rear when towing- has worked fine. 19's with Michelin Diamaris last year, now have Michelin Lattitudes- we go through tires pretty quickly...OEM's were Pirellis, used 48 with them as well.

LVDell

Randy, I do 42F 49R.

RJFabCab

Thanks for the replies. My issue is the max pressure of 50 psi on the OEM Pirelli sidewall.

The consensus seems to be 48-49 psi cold in the rear when loaded and towing. I figure maybe +4 psi when driving putting me somewhere in the neighborhood of 53 psi hot under load.

It's exceeding the sidewall pressure limit that has me concerned.

LVDell

You should be fine unless you have LED lights installed on your wheels

ltc

Recommended cold tire inflation pressure
These values are for cold tires (68°F/20 °C).

ltc

The MAX pressure listed on the sidewall is a cold (68degF/20degC) inflation pressure spec.
The tire (depending on nitrogen fill vs std air/humidity fill) pressure will exceed 50psi when hot, this is normal and within (N rated) tire specifications.

I would recommend nitrogen fill for your tires, especially if you are running TPMS.

RJFabCab

Thanks, Larry.

RJFabCab

H- to the "!"zzo

Word.

ltc

You're welcome.
Nitrogen is becoming the recommended fill for all vehicles with TPMS sensors, as it helps minimize the effects of moisture impingment into the electronics.
You would be amazed how much water you can store in a tire filled with humid compressed air....not exactly what electronics like to be around.

JPhillips-998

I have the TPMS on my summer wheels...going to go deflate now...thanks for the tip!

ltc

That will help a little bit, but to do a proper job, you should take the tires off the wheels, remove any water, dry the inside of the tire/wheel/TPMS, remount, inflate with N2 (or dry air) and rebalance.
As I mentioned, depending on the relative humidity and water in the compressor/lines used during the last fill, the amount of water inside a wheel is amazing.

JPhillips-998

I guess it would be important to at least store them valve side up so they don't sit in water. Also, if I pull the schrader valves do you think enough air would "circulate" to avoid any condensation?

ltc

If placed in a warm, dry environment, the water might eventually escape.
You may just want to wait until your next opportunity for a remount/rebalance.

It's not an urgent thing, just dont' want to have TPM$ sensor failures once you're 'naked'.
With federal requirements that all vehicles now be equipped wtih TPMS, it will start to become more of an issue.....and tire stations are now using nitrogen (though not bottled, usually from a local generation source) or very dry shop air.