TV tire pressures

[Too tall]

I've got a 2016 Tundra with stock Michelin LT275/70R18 LTX A/T2

IIRC the spec. for this tire is: max load: 3750 lbs. @ 80 psi which alot more than I've been running.

Towing a 25' FC FB what should front/back pressures be?

[Action]

What does the truck weigh on each axle when set up to tow with trailer connected?


>>>>>>>>>>>>>>>>Action

[malinois38]

I have had the same truck and tire combination for the last 130,000 miles. I run 50lbs all around when not towing so as not to rattle the molars. When towing I run run 72lbs rear and 70lbs in the front. I have got 65,000 & 68,000 out of my last two sets of tires. I’m happy with those numbers.
Below is a chart with numbers supposedly from Michelin. I could not dig up anything else off the net without contacting Michelin.

[HowieE]

Tire pressure should be set by the weight on the tire.
Goodyear seams to be the only manufacture still publishing an inflation chart. However each given size of tire is supposed to be made to the same standards per Federal Regulation so you can use it.

https://www.goodyearrvtires.com/pdfs/rv_inflation.pdf

[HowieE]

Originally Posted by malinois38

Below is a chart with numbers supposedly from Michelin. I could not dig up anything else off the net without contacting Michelin.

Please post the URL for this chart. Michelin had not made that information public for some time. It would be great to have.

[Tireman9]

Originally Posted by HowieE

Tire pressure should be set by the weight on the tire.
Goodyear seams to be the only manufacture still publishing an inflation chart. However each given size of tire is supposed to be made to the same standards per Federal Regulation so you can use it.

https://www.goodyearrvtires.com/pdfs/rv_inflation.pdf

While most trie companies follow identical Load Inflation chart as published by US TRA Michelin has a few outliers.

Tuesday, April 21, 2015 I published a blog post with links to many different tire company charts including Michelin LT sizes.

Sorry but I am not allowed to post a direct link to my blog. others have posted links or you can look at my home page for more info.

[Mollysdad]

Originally Posted by Too tall

I've got a 2016 Tundra with stock Michelin LT275/70R18 LTX A/T2

IIRC the spec. for this tire is: max load: 3750 lbs. @ 80 psi which alot more than I've been running.

Towing a 25' FC FB what should front/back pressures be?

Isn't there a door sticker on the Tundra? Mine has one, although I have Bridgestone and they recommend 33 PSI.

[majorairhead]

Originally Posted by Mollysdad

Isn't there a door sticker on the Tundra? Mine has one, although I have Bridgestone and they recommend 33 PSI.

I contacted Ford and asked them directly about tire pressure. They said go by the sticker on the door jamb, NOT the max. on the tire.

Here's another of those questions that'll stimulate the varying and opposing opinions.

I did try max on the f150 tires and it gave me a floating ride when towing, went back down to door sticker and she rode just fine.

With the F250 now, I tow right at the door sticker psi.

[Too tall]

The door sticker says 30/33 psi F/R. I cleaned the sidewalls and my LTX/AT2 P275/65R18 says Max is 51 psi and Max Load 2601 lbs

I do not have easy access to a cat scale (yet) but I'm going to assume for my FC 25' RB Twin the tongue weight is < 900 lbs

What's the hive mind have to say for F/R TV recommended tire pressure?

:beers:

[Bill M.]

I would try 35 and 50 for a starting point when towing. It would be good to get the actual axle weights though. I do not think that tire pressure is really critical and I do think that more is better to a point.

[ShinyPete]

Too tall-

There is a obviously a big difference in the LT AT2s in your initial post and the P series AT2s in post #9. If you have the P series XLs (and I think you do based on the 51lb max pressure and 2601 weight rating - same as my P XL Wranglers), I'd run 50-51 psi cold in all four tires.

That's what we run based on our weights and probably 15,000 miles of towing our 27fb, 3500 lb boat, or 4000+lb enclosed cargo trailer with the current truck. They're a little stiff around town, but rock solid at around 50 psi when towing any of the three toys. FWIW

Hope this helps.

[dznf0g]

Originally Posted by majorairhead

I contacted Ford and asked them directly about tire pressure. They said go by the sticker on the door jamb, NOT the max. on the tire.

Here's another of those questions that'll stimulate the varying and opposing opinions.

I did try max on the f150 tires and it gave me a floating ride when towing, went back down to door sticker and she rode just fine.

With the F250 now, I tow right at the door sticker psi.

As a rep for GM, I support this answer. For GM, the official stance is, run the door placard pressures all the time.

[Too tall]

Thanks Pete, you are right. I must have the P series because the sidwall shows 51psi max.

Question for Rich. I hear you...run the door placard at all times. Is that a hard stop or is there sense in running higher if the bed+tongue load are at max?

I get your logic, just getting a better comfort level with the why part.

Originally Posted by ShinyPete

Too tall-

There is a obviously a big difference in the LT AT2s in your initial post and the P series AT2s in post #9. If you have the P series XLs (and I think you do based on the 51lb max pressure and 2601 weight rating - same as my P XL Wranglers), I'd run 50-51 psi cold in all four tires.

That's what we run based on our weights and probably 15,000 miles of towing our 27fb, 3500 lb boat, or 4000+lb enclosed cargo trailer with the current truck. They're a little stiff around town, but rock solid at around 50 psi when towing any of the three toys. FWIW

Hope this helps.

[A W Warn]

Originally Posted by Too tall

Thanks Pete, you are right. I must have the P series because the sidwall shows 51psi max.

Question for Rich. I hear you...run the door placard at all times. Is that a hard stop or is there sense in running higher if the bed+tongue load are at max?

I get your logic, just getting a better comfort level with the why part.

I don't have the same truck, but do have the same size P tires. At first I went with the door sticker recommendations, but had excessive wear on the outer sides of the front tires, not related to alignment or balance. (same experience on multiple GM trucks) And, when towing the rear axle felt a little soft under load. After experimenting with various pressures, I now run ~38 PSI all four tires all the time. IMO: overall ride comfort, carrying capacity, and wear pattern have improved. I think MPG has improved slightly with the firmer tires, but not enough data to say for sure.
I do not see a negative to adding a few PSI.

add edit:
the placard on my door says 32 psi front - 38 psi rear.

[Action]

Originally Posted by Too tall

Question for Rich. I hear you...run the door placard at all times. Is that a hard stop or is there sense in running higher if the bed+tongue load are at max?

To chime in on this, I would be inclined to run higher pressures AFTER the load has been measured. You have not run your TV across the scales in a loaded manner or with a towed load.

Fine tuning tire pressure (my words) can not be done until you know where you are at. Otherwise door sticker pressure is the best that you can do at this point.

If you want to get to the place of making changes. One needs to know why they are making a change. Guessing is a poor choice.

>>>>>>>>>>Action

[Too tall]

Yup. Somewhere between here and FL that will happen.

In the meantime.....

Originally Posted by Action

To chime in on this, I would be inclined to run higher pressures AFTER the load has been measured. You have not run your TV across the scales in a loaded manner or with a towed load.

Fine tuning tire pressure (my words) can not be done until you know where you are at. Otherwise door sticker pressure is the best that you can do at this point.

If you want to get to the place of making changes. One needs to know why they are making a change. Guessing is a poor choice.

>>>>>>>>>>Action