39 PSI? REALLY?

[Toffen]

Am I the only one who finds the ride unacceptably harsh with the Sasquatch tires at 39psi?
my previous ride was a JKU with 34” BFG Km2s that I ran at 32psi.
With all the hype, I was expecting the Sas Bronco to be a much smoother ride…
it is NOT.
I dropped the pressure to 37 last week and it helped a little. Today I dropped them to 35psi cold and it is starting to feel acceptable.
The tires are labeled as 35psi max, and I am guessing that Ford has specified 39psi to help with gas mileage…
am I missing something?

Sponsored

 

[PSUTE]

Several previous reports of over inflation from the factory...

 

[Exomodo]

I like a firm road feel.

 

[lasttj]

The tires say 35 Max psi? And the pressure label on the Bronco says 39? I've never heard of recommended pressure being higher than the max pressure.

 

[Gamecock]

The tires say 35 Max psi? And the pressure label on the Bronco says 39? I've never heard of recommended pressure being higher than the max pressure.

They don't....people are mis-intrepreting what it says...it is providing the MAX LOAD AT 35 PSI. Max PSI is not 35.

 

[Toffen]

They don't....people are mis-intrepreting what it says...it is providing the MAX LOAD AT 35 PSI. Max PSI is not 35.

So my question is, is there any harm done in running 35 (or lower) psi?

 

[Bronco21fan]

Am I the only one who finds the ride unacceptably harsh with the Sasquatch tires at 39psi?
my previous ride was a JKU with 34” BFG Km2s that I ran at 32psi.
With all the hype, I was expecting the Sas Bronco to be a much smoother ride…
it is NOT.
I dropped the pressure to 37 last week and it helped a little. Today I dropped them to 35psi cold and it is starting to feel acceptable.
The tires are labeled as 35psi max, and I am guessing that Ford has specified 39psi to help with gas mileage…
am I missing something?

My Sasquatch ride seems fine to me at 39 have had no issues comfortable as hell it that’s just me

 

[AK SNO RIDER]

So my question is, is there any harm done in running 35 (or lower) psi?

You will see reduced responsiveness and lifespan running low pressure. 35 isn't "too low" but I would keep it 32 or above for highway use.

 

[dgorsett]

My non Sas with 255's recommends 35 psi, which seems about right. In my experience a bigger tire will carry the same load with less psi so 39 psi for the 315's has never made sense to me. And since max load is at 35 and Ford wouldn't have put an underrated tire on the vehicle (at least after the Firestone/Explorer debacle) I would bet 35 or even less would be safe and practical. As stated, maybe 39 is Ford trying to achieve better fuel economy.

 

[RagnarKon]

So my question is, is there any harm done in running 35 (or lower) psi?

Agree with @AK SNO RIDER.

35 PSI definitely isn't in the "dangerously low" territory. I'd be surprised if the TPMS turned on the warning light at 35 PSI.

Realistically you'll just have reduced fuel economy and potentially lower tread life. If you do long trips, load up a bunch of gear, or tow I'd personally air back up to the recommended PSI. I'd also keep on eye on it when during the fall/spring due to the wild temperature swings—especially since you are in Canada—but beyond that, should be fine.

Just know that you are intentionally ignoring manufacturers recommendations, and therefore there may be some consequences—including reduces tire lifespan and potential safety concerns. But yeah, I personally would be 100% comfortable running 35 PSI for most everyday driving situations.

 

[WuNgUn]

So my question is, is there any harm done in running 35 (or lower) psi?

Is that a Goodyear? I thought the Squatch tires specified "up to 39psi permitted", not an additional 10psi...
So if 35 is for full payload-out, what would be recommended for a daily driver with a single occupant? 32 or 31psi?

And why does Ford specify 39?

 

[WuNgUn]

Agree with @AK SNO RIDER.

35 PSI definitely isn't in the "dangerously low" territory. I'd be surprised if the TPMS turned on the warning light at 35 PSI.

Realistically you'll just have reduced fuel economy and potentially lower tread life. If you do long trips, load up a bunch of gear, or tow I'd personally air back up to the recommended PSI. I'd also keep on eye on it when during the fall/spring due to the wild temperature swings—especially since you are in Canada—but beyond that, should be fine.

Just know that you are intentionally ignoring manufacturers recommendations, and therefore there may be some consequences—including reduces tire lifespan and potential safety concerns. But yeah, I personally would be 100% comfortable running 35 PSI for most everyday driving situations.

Seeing as the speed limit in some states and the propensity of people to speed, running a loaded up 4 door, 2.7L Squatch with the wife, 3 kids and the dog, flying down the freeway at 85Mph for a 3 hour stretch with your tires at 30 psi is gonna be trouble.

 

[Toffen]

Agree with @AK SNO RIDER.

35 PSI definitely isn't in the "dangerously low" territory. I'd be surprised if the TPMS turned on the warning light at 35 PSI.

Realistically you'll just have reduced fuel economy and potentially lower tread life. If you do long trips, load up a bunch of gear, or tow I'd personally air back up to the recommended PSI. I'd also keep on eye on it when during the fall/spring due to the wild temperature swings—especially since you are in Canada—but beyond that, should be fine.

I was thinking exactly that. If I am planning a lot of highway miles, I’ll probably air back up to 39. (The ride is not as noticeable on smooth blacktop)
We live in a rural area with a lot of bad pavement and the last couple of miles home is potholed gravel…
the TPMS doesn’t seem to mind 35…

 

[Bronkers]

Agree with @AK SNO RIDER.

35 PSI definitely isn't in the "dangerously low" territory. I'd be surprised if the TPMS turned on the warning light at 35 PSI.

Realistically you'll just have reduced fuel economy and potentially lower tread life. If you do long trips, load up a bunch of gear, or tow I'd personally air back up to the recommended PSI. I'd also keep on eye on it when during the fall/spring due to the wild temperature swings—especially since you are in Canada—but beyond that, should be fine.

Just know that you are intentionally ignoring manufacturers recommendations, and therefore there may be some consequences—including reduces tire lifespan and potential safety concerns. But yeah, I personally would be 100% comfortable running 35 PSI for most everyday driving situations.

Just stumbling across this seemingly obvious rejection of GY's specs by Ford- my door tag says 39psi cold.

GY says 35psi.

What's the difference that allows Ford to avoid liability in this?

 

[RagnarKon]

Just stumbling across this seemingly obvious rejection of GY's specs by Ford- my door tag says 39psi cold.

GY says 35psi.

What's the difference that allows Ford to avoid liability in this?

Goodyear is listing the maximum tire pressure at maximum load. The Bronco doesn't put that tire anywhere near maximum load.

The Goodyear Territories are rated for 5070 lbs per axle (2535 per tire). GAWR on the Bronco is 3270 lbs for the front, and 3070 lbs for the rear. So the Bronco's maximum ratings are well below the tires maximum ratings.

Sponsored