half ton upgrades - XL tires?

**gbkims** · 06-11-2019, 08:40 PM

Well it seems passenger and pickup load inflation charts are scarce now days.
The last one from Ram I've seen was 2006: http://www.rambodybuilder.com/2006/d...tirecharts.pdf

Michelin does have this example of tire temperatures vs pressure:
https://www.michelinman.com/US/en/sa...-pressure.html
Passenger & Pickup https://www.michelinman.com/img/stor...ight_Truck.pdf
3/4 & 1 Ton https://www.michelinman.com/img/stor...Ton_Trucks.pdf

I wonder if the mandatory TPMS in cars and SRW pickups had them stop publishing the load inflation charts.

RV & Large Truck Load Inflation Charts are still available:
RV - https://www.michelinrvtires.com/refe...lation-tables/
Truck - https://www.michelintruck.com/refere...tion-tables/#/

Michelin Truck Tire Service Manual
https://www.michelintruck.com/refere...tion-tables/#/

**MidwestCamper** · 06-12-2019, 04:39 AM

Originally Posted by riven1950

We have E rated Michelin Defenders on our 2018 F150 and really like them. They ride a little rougher than the P rated tires but tow great. We run 40psi not towing and 55psi towing.

X2. I run 42 psi loaded or unloaded. Pressure will climb to 48 psi (both front and rear) when towing.

**Dale G** · 06-12-2019, 02:35 PM

Originally Posted by gbkims

Well it seems passenger and pickup load inflation charts are scare now days.
The last one from Ram I've seen was 2006: http://www.rambodybuilder.com/2006/d...tirecharts.pdf

Michelin does have this example of tire temperaters vs pressure:
https://www.michelinman.com/US/en/sa...-pressure.html
Passenger & Pickup https://www.michelinman.com/img/stor...ight_Truck.pdf
3/4 & 1 Ton https://www.michelinman.com/img/stor...Ton_Trucks.pdf

I wonder if the mandatory TPMS in cars and SRW pickups had them stop publishing the load inflation charts.

RV & Large Truck Load Inflation Charts are still available:
RV - https://www.michelinrvtires.com/refe...lation-tables/
Truck - https://www.michelintruck.com/refere...tion-tables/#/

Michelin Truck Tire Service Manual
https://www.michelintruck.com/refere...tion-tables/#/

Sorry to hijack the thread. The last one you listed matches the numbers the Michelin Tech was using when I talked to them, so they must be the same for all LT tires of that size. https://www.michelintruck.com/refere...tion-tables/#/ The only thing confusing is it seems they have the dual vs single numbers reversed.
Dale

**Dale G** · 06-12-2019, 02:42 PM

Originally Posted by riven1950

Ours is a 2500rl, GVWR is 7495, listed tongue weight is 581lbs.

Have not weighed this TT but I am thinking our weight is around 7000lbs. tongue weight is likely 800-850lbs

After multiple calls to Michelin I was able to get a different answer for everyone I talked to so the recommended pressures were; what my truck said I should run (35PSI), 40PSI, and 50PSI. Then I got in touch with a young lady that actually knew what she was talking about, or at least it seemed that way. She said a "P" metric tire in the size P275/65R18 would have a rating of 2403lbs when inflated to the suggested 35PSI, now we are getting somewhere. She said the LT Defender LTX in a LT275/65R18 is rated at 2310lbs at 45PSI and 2535lbs at 50PSI. In order to match what the truck came with I would need to run 47PSI on the Michelin tires to equal 2403lbs of the original equipment tires. I think we have a good solid answer. She said that there is no need to run more pressure when towing unless I wanted to have a stiffer sidewall. I might try towing at 47PSI to see if the tires are still stiff enough to keep the trailer from swaying, if not, I can always add a little air until it is more stable.

Dale

**riven1950** · 06-12-2019, 03:16 PM

Originally Posted by Dale G

After multiple calls to Michelin I was able to get a different answer for everyone I talked to so the recommended pressures were; what my truck said I should run (35PSI), 40PSI, and 50PSI. Then I got in touch with a young lady that actually knew what she was talking about, or at least it seemed that way. She said a "P" metric tire in the size P275/65R18 would have a rating of 2403lbs when inflated to the suggested 35PSI, now we are getting somewhere. She said the LT Defender LTX in a LT275/65R18 is rated at 2310lbs at 45PSI and 2535lbs at 50PSI. In order to match what the truck came with I would need to run 47PSI on the Michelin tires to equal 2403lbs of the original equipment tires. I think we have a good solid answer. She said that there is no need to run more pressure when towing unless I wanted to have a stiffer sidewall. I might try towing at 47PSI to see if the tires are still stiff enough to keep the trailer from swaying, if not, I can always add a little air until it is more stable.

Dale

Wow, amazing the different answers, but it sounds like you got the same person I did when I called

40 non towing and 55 towing is good for us so I think you are thinking correctly. Good luck with it

**MidwestCamper** · 06-12-2019, 06:23 PM

Originally Posted by riven1950

Wow, amazing the different answers, but it sounds like you got the same person I did when I called

40 non towing and 55 towing is good for us so I think you are thinking correctly. Good luck with it

With your weight slips you may find that you do not need the 55 psi when loaded. This pressure would be capable of supporting over 5000 lbs on each axle.