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Old 10-27-2017, 03:35 PM #76
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Ok so you guys have done a ton of great work here but I'm not smart enough to compile what I need for my situation. Anyone willing to give a suggested pressure I should run on my rig?

- 1997 4runner 4x4 Stock Weight
- LT33X12.5XR17 Atturo Trail Blade M/T Mud-Terrain Radial Tire 114Q 8 Ply D-Load

Your help is appreciated!
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Old 10-30-2017, 10:40 AM #77
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Funny, I switch my 2004 Durango from P245/70/17 to LT265/70/17 several years ago and consulted this very thread to find 44psi as where I wanted to be. Truck and tires did great.

I never really paid attention to this being a 4runner forum at the time, I was just out for tire info.

Fast forward to today. Durango died, got a 2016 4Runner and here I am again.

So who runs LT265/70/17 BFG All Terrain TA/KO on stock rims and what pressures have you found works best?
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Old 10-30-2017, 03:17 PM #78
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I have the BFG KO2s E load and run 30 lbs. in all of them. I rotate them per the manual at 7,500 miles and have had great wear. One set of the original BFG KOs lasted me 108,000 miles, and still wasn't down to the wear indicators!
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Old 12-22-2017, 10:11 PM #79
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LT 285 70/R18 Tire Pressure Chart

I am running 285 70/R17 Cooper ST Maxx on my 2005 4runner, below is the advise from Cooper tire customer support and a loading/psi chart is attached for everyone to review. I am setting all 4 tires to 35 psi on normal load.

======
Always follow the air pressure recommendation of the vehicle manufacturer (as listed on the placard on the door of your vehicle). Proper air pressure is based on the weight of your vehicle and not the brand or type of tire you have. Even though you've changed tire sizes you would still utilize the door placard recommended pressure settings. Also, never exceed the max air pressure as listed on the sidewall of the tire.
=====
Attached Images
File Type: pdf Load & Inflation table 70R17 sizes.pdf (526.6 KB, 272 views)
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Old 01-07-2018, 08:03 PM #80
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PSI Question

Hello All,

I just purchased a 2018 4R SR5 with the Predator Package. I love this truck so far, but have been getting roughly 11-12 mpg around town, while driving conservatively. I just increased my tires PSI from 27 to 41 and immediately saw an improvement to 17-18 mpg. Can anyone tell me if I have currently overinflated them?

My tire specs are Goodyear Wrangler Duratrac

165/70R/17
Load index of 115
Load Range SL
Speed Rating S
Max PSI 51
Max Load Per Tire 2,679

Thanks for the help!
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Old 10-16-2018, 02:20 PM #81
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ragamuffin I don't no anything about the tire psi but I just bought the same vehicle but 2019 an have a vibration at 55 to 60 mph had dealer balance an still have a slight vibration they said it would go away after breakin did you experience this I believe they are bs ing me .
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Old 12-02-2018, 12:50 AM #82
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Quote:
Originally Posted by JB. View Post
Was playing around with a small compressor in the garage a few weeks ago. One thing led to another and I ended up measuring tire deflection on the passenger front in 5lb increments from 80psi down to 5psi. The result is the graph below. One thing I wanted to know is what the curve looked like below 35psi where the load tables end for LT tires. I originally drew the lines in the charts, above, straight down to 20psi to make the relationships more obvious at a glance. They are a little too straight as it is, but continuing them straight past the end of the load tables needed to be fixed, and now it is.

It's interesting to me how 35psi is just about the spot where the curve below really starts to bend. I'm assuming it's no coincidence that's where the LT load tables end.

old post, but this is great stuff, enough to convince me to never run an LT below 35 psi, thanks
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Old 02-07-2019, 08:40 PM #83
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This is a great thread.

I don't think I know anyone personally who runs proper pressures on LT tires on offroaded vehicles. I know they can be unbearable in daily driving. I used mine at 10% less than optimal but still at 39 psi, not under 35. And 39 was far too much for an empty vehicle.

Still, looking at pages 2-3 in this Nitto tech bulletin is a good thing to do:
https://www.nittotire.com/media/1529...TSD-12-011.pdf

30 psi on an LT on pavement is just asking for trouble; whether it happens is another question.
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Old 05-01-2019, 06:44 PM #84
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I have an '03 V8 LTD AWD and have had Michelin LT 265/65R17 installed for 2-1/2 years and 25K miles, all on road, and run 37psi. Tires perform very well in all conditions (Chicago area) and are wearing very evenly. I rotate one tire to spare every November and May. MPG is 14.5-15.2 mostly 25 mile per day crawling around streets.
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Old 05-05-2019, 02:08 PM #85
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Quote:
Originally Posted by rdruss View Post
I have an '03 V8 LTD AWD and have had Michelin LT 265/65R17 installed for 2-1/2 years and 25K miles, all on road, and run 37psi. Tires perform very well in all conditions (Chicago area) and are wearing very evenly. I rotate one tire to spare every November and May. MPG is 14.5-15.2 mostly 25 mile per day crawling around streets.
do you run that pressure all the way around? Right now i have the same size LT M's and run 33 in the rear and 35 front. Currently not trailering or carrying extra weight in the rear. i rotate every 5K miles. wear and ride comfort is fine. if i'm doing something wrong, it sure doesn't show, but i do have the impression Michelin quality has something to do with that.

if no-one can chime in on whether this is wrong, i will probably call Michelin and/or research elsewhere.
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Last edited by sport2004; 05-05-2019 at 05:48 PM.
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Old 05-05-2019, 03:48 PM #86
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Quote:
Originally Posted by sport2004 View Post
do you run that pressure all the way around? Right now i have the same size LT M's and run 33 in the rear and 35 front. Currently not trailerng or carrying extra weight in the rear. i rotate every 5K miles. wear and ride comfort is fine. if i'm doing something wrong, it sure doesn't show, but i do have the impression Michelin quality has something to do with that.

if no-one can chime in on whether this is wrong, i will probably call Michelin and/or research elsewhere.
You should ask them anyway, I suppose they will reply something in the 42-44 range. They will calculate it so as to ensure the same % of spare capacity that the OEM P-metric tire had.

Driving lower first eliminates that safety buffer.

You can bet they will say it is wrong to run them at 35/33 because at those pressures the capacity is decreased by a lot (but then there is the issue of what size one is running).

People get away with a lot but I did drive over a burst MT from a Jeep on the highway last week. My non-expert understanding is that driving LTs on the highway consistently under 35 if really pushing it.

I am sure there is a way to calculate the load capacity at various pressures.
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Old 05-05-2019, 07:39 PM #87
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Yes, 37psi all around and the ride is great. These tires feel better in every way than the B-stone P-metrics they replaced.
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Old 05-07-2019, 12:45 PM #88
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Quote:
Originally Posted by MAST4R View Post
You should ask them anyway, I suppose they will reply something in the 42-44 range. They will calculate it so as to ensure the same % of spare capacity that the OEM P-metric tire had.

Driving lower first eliminates that safety buffer.

You can bet they will say it is wrong to run them at 35/33 because at those pressures the capacity is decreased by a lot (but then there is the issue of what size one is running).

People get away with a lot but I did drive over a burst MT from a Jeep on the highway last week. My non-expert understanding is that driving LTs on the highway consistently under 35 if really pushing it.

I am sure there is a way to calculate the load capacity at various pressures.
Well, the convo with the Michelin CSR did not inspire confidence. She told me the PSI without asking which tire, though she did ask the size. So, the first response was 33 psi front/rear.

Then I told here they were LT's, and she said 44 psi front/rear. Even though I did not like how the call went, her advice seems consistent with what is recommended here.

Another thing, the dealer rotates and corrects inflations every 5K miles, and they aren't paying attention either...???!!! The sidewall indicates "X RADIAL LT 2"...hard to miss.
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Old 05-07-2019, 04:17 PM #89
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PSA: If a Michelin tire product is marked "P265/65R17" and "X RADIAL LT2", they are not LT tires. Little confusing, but an email and another call resolved this.

I do not have LT tires, recommended inflation 32 psi all around.

I will unsubscribe from the thread within 10 seconds...LOL

10, 9, 8,...
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Old 05-07-2019, 07:09 PM #90
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Quote:
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PSA: If a Michelin tire product is marked "P265/65R17" and "X RADIAL LT2", they are not LT tires. Little confusing, but an email and another call resolved this.

I do not have LT tires, recommended inflation 32 psi all around.

I will unsubscribe from the thread within 10 seconds...LOL

10, 9, 8,...
Well, yeah, it is whatever goes with the tire size, like P265 70 17 or LT265 70 17. Good you got it sorted out quickly because some P-metric tires have 44 psi as their max pressure, others have 51.

LTC are 50, LTD are 65, and LTE is 80.
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