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Old 04-11-2015, 10:22 AM   #11
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So I upgraded my range c tires to load range D. Max psi is 65. Trailer tag says 50 max psi. this is assuming that C range tires are being used...Correct?


Do I run the d's with 50 or 65?
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Old 04-11-2015, 10:26 AM   #12
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So I upgraded my range c tires to load range D. Max psi is 65. Trailer tag says 50 max psi. this is assuming that C range tires are being used...Correct?


Do I run the d's with 50 or 65?
Run what is on the sidewall of the tire, the trailer tag has no idea what you put on the rims.
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Old 04-11-2015, 10:30 AM   #13
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Run what is on the sidewall of the tire, the trailer tag has no idea what you put on the rims.
Would that apply to TV tires as well?
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Old 04-11-2015, 10:36 AM   #14
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Would that apply to TV tires as well?
IMO, Yes it does especially if you have changed size or load rating.
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Old 04-11-2015, 11:14 AM   #15
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On my 2014 GMC 2500 I keep 75# I the front and 80# in the rear. If I drop down to 65 and under my ONSTAR and TPMS tells me I have low tires. The opposite can happen if you upgrade tires. I had a 2008 GMC 1500 that I put D rated tires and kept 65# in them for towing. The TPMS would alert me whenever I had over 50# in them which was a pain. Even GM dealers told me there was no way to bypass this alert. Sometimes it doesn't pay to make changes.
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Old 04-13-2015, 09:10 PM   #16
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I found BFG makes the at/k2 tires in LT275/55/20 so getting those when Pirelli's wear some more


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Old 04-13-2015, 10:29 PM   #17
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Whatever the door jam says is what they should be at. Back in the day, it was believed to be better. These days, vehicles are designed to and built around a certain tire pressure for all modes, towing or not. You should never have to fill tires to their marked max PSI. It's there just for safety information, not to test the limits. For a trailer, I can't say. I don't even know what is Recomended, but I think it's time to look.
I'd say this info is incorrect. P rated tires are known to be a little flimsy and cause sway so pumping them up to 40-44 psi helps eliminate lots of that.

If you have standard trailer tires I'd advise you to always run at max. cold pressure.
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Old 04-13-2015, 10:36 PM   #18
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I'd say this info is incorrect. P rated tires are known to be a little flimsy and cause sway so pumping them up to 40-44 psi helps eliminate lots of that.

If you have standard trailer tires I'd advise you to always run at max. cold pressure.
I agree, in fact, a couple of times when I had P tires, I ran the back ones to 50# and it was better than the 44#. P tires on a tow vehicle just will not wear very well at all. Even with running higher pressure, mine wore out in about 25K while the LT E's run 75K and still have good tread pulling similar loads.
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Old 04-14-2015, 03:27 PM   #19
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The Pirelli P275/50/20's that came on my F150 are good for dry road but slushy for towing, I hate that side to side slop


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Old 04-15-2015, 03:15 PM   #20
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If you always put the recommended tires on your TV as recommended from the dealer, use the door jam. The TV was designed to ride safely and smoothly at a specific tire pressure whether it was towing or not. Even with tires marked as max PSI, it is not recommended to fill to max. Always stick to the door jam and or sticker for recommended PSI on both the trailer and TV. I learned this from more than one dealer. Max PSI is just that "MAX".

Imaging if you filled a tire to max PSI. then the next day, you drove to your campsite. the site was a couple hours away and the weather was hotter that day. Air expands. now your "MAX" pressure is above max and you have a great chance of having a blow out and causing improper tread wear.

It does matter if you change tire ratings and even size as mentioned by OldCoot and Pap. recommended tire pressure is based on factory tires for your vehicle. So if you did upgrde, then your door jam is probably wrong. But even with factory tires, look at the door jam, and then look at the MAX PSI. they are not the same. Usually about 20 lbs off. Your max air pressure is just a safety rating. go above that and your being dangerous. Always check with the dealer if there is a question and they will tell you the same thing. Always get more than one "opinion".
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