10-17-2019, 08:15 PM
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#31
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Join Date: Jul 2012
Location: Charleston, SC
Posts: 857
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Location: Charleston, SC
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Quote:
Originally Posted by Ryan1975
Lowered mine to 10psi for last March’s Bomb Cyclone
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Don't like seeing that your 2012 tE is gone! But glad to see it's not forgotten! Love mine, Black Betty rocks on with 182k so far!
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2012 Trail Edition |KDSS |BLACK| 265/70R17 C KO2's @ 44psi | 250,000+ miles |>Link To Inside Fishing Rod Holder Mod
2017 LAND CRUISER URJ200 | MGM | 285/60R18 | 62,000 miles
I am fragile.
Not like a flower.
But like a bomb.
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10-17-2019, 08:25 PM
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#32
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Member
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Join Date: Aug 2019
Location: Nowhere, Nevada
Posts: 632
Real Name: Dave
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Member
Join Date: Aug 2019
Location: Nowhere, Nevada
Posts: 632
Real Name: Dave
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Quote:
Originally Posted by Jivewalker
I also think there is some thought that needs to be put into whether LT tires are the right choice. If you think about it, the higher psi gives a harsher ride and more jarring and wear on suspension components. Is it wort the trade off if you don't also upgrade the suspension to handle the increase in harshness? Or, is it better to get some beefy P rated all terrains, if they even exist. Then you could have the more flexy cushion of air between the trail/road and the suspension? Maybe its all bullshit piss ant stuff and I'm overthinking it, but it does make some sense. 40 is doing great for me right now with the KO2's, would love to slap some P rated tires back on at 32psi just to see the difference. I may even take the KO2's up to the recommended 44psi just to check it out like others have.
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I considered if 10 ply E rated tires were overkill, vs. 6 ply C rated. But two things swayed me 10 ply. A. Price. There was little difference in price between the two as quoted by my local dealer. And B. Dirt roads and trails. Where I live, miles and miles of maintained are regularly used. When hunting and off roading for pleasure, there is lots of decomposed granite, sharp bedrock and other obstacles.
Since the 4Runner is relatively heavy, the better value for me is an E rated tire.
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~When You Live in Nevada, "just down the road" is anywhere in the line of sight within the curvature of the earth.
2018 4Runner SR5
2012 Subaru Outback Premium
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10-17-2019, 08:52 PM
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#33
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Senior Member
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Join Date: Dec 2010
Location: Monument / PAFB
Posts: 1,264
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Join Date: Dec 2010
Location: Monument / PAFB
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Quote:
Originally Posted by Jivewalker
Don't like seeing that your 2012 tE is gone! But glad to see it's not forgotten! Love mine, Black Betty rocks on with 182k so far!
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2016 with 107k
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10-22-2019, 12:25 AM
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#34
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Join Date: Oct 2011
Location: Alaska
Posts: 59
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Join Date: Oct 2011
Location: Alaska
Posts: 59
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Thank you
This is one of the most informed threads on tire pressure I have seen in a lot of years on any forum. I have applied some of the information here to other cars and trucks we have. Some of my thoughts:
1. Switching from "P" tires to "LT" tires is a significant difference in tire loads and capabilities. The door jam sticker is no longer relevant, even if you use the same size tire. If you change tire size or brand, more math and experimenting/guesswork is needed.
2. We changed out the 20 inch wheels and tires on our Limited for SR5 wheels and stock size tires, but kept "P" tires, so the door jam is still mostly relevant. Summer is "P" Bridestone and winter is "P" Blizzak. So, about 32 to 34 PSI. We have not changed to any "LT" tires...yet.
3. Here is the biggie: Regardless of the tire we use, temperature is very important along with load range. When I set my cold tires' pressure in my 60-degree garage at 32 for "P" or 44 for "LT", that is fine for now. Then I open my garage door and leave, and the temperature may be 50-70 degrees colder outside (I'm in Alaska). If I am driving in town, they stay very cold (or after work outside). If I get on the highway, they probably warm up some. Rule of thumb is lose 1 PSI for each 10 degrees of temperature. Take that into account when you set your tire pressure if Summer and Winter are very different. After being at work all day in winter, my 32 PSI is probably a lot lower when I hit the road.
I set my "P" tires for 32 PSI in the Summer and 38 PSI in the winter. If I had "LT" tires, I would set them around 40 PSI in Summer and 46 PSI in Winter.
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10-22-2019, 11:27 AM
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#35
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What are you over inflating them in winter, that seems almost opposite of what you would want
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10-23-2019, 10:36 AM
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#36
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Join Date: Oct 2011
Location: Alaska
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Join Date: Oct 2011
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Quote:
Originally Posted by jhguth
What are you over inflating them in winter, that seems almost opposite of what you would want
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Because at negative 20 degrees outside, the pressure quickly drops to where it should be or lower. I set the PSI in the garage; I drive outside. From my garage to the outside can change the pressure almost 10 PSI down.
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10-23-2019, 11:09 AM
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#37
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Join Date: Oct 2016
Location: Nevada
Posts: 1,184
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Location: Nevada
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Quote:
Originally Posted by jhguth
What are you over inflating them in winter, that seems almost opposite of what you would want
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The guy lives in AK
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10-24-2019, 02:01 PM
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#38
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Junior Member
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Join Date: Mar 2012
Location: Canada
Posts: 6
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FYI and FWIW I went to the BFG website and hit the chat with us icon and had the following conversation:
Porter T (10/24/2019, 2:53:15 PM): Hello, I'm Porter How Can I help you?
(10/24/2019, 2:54:04 PM): for All-Terrain T/A® KO2 your site says a pressure increase to 44psi but my 4runner manual says 32, which do i use ?
Porter T (10/24/2019, 2:55:38 PM): Use the 44 PSI. Since the KO2 is a bigger tire, it will require more air. the vehicle most likely came with a P metric, smaller tire thus the lower PSI. But since you changed to LT, thus you raise the PSI.
(10/24/2019, 2:55:52 PM): ok ty
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10-24-2019, 03:46 PM
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#39
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Join Date: Oct 2011
Location: Alaska
Posts: 59
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Join Date: Oct 2011
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Quote:
Originally Posted by Garwel
FYI and FWIW I went to the BFG website and hit the chat with us icon and had the following conversation:
Porter T (10/24/2019, 2:53:15 PM): Hello, I'm Porter How Can I help you?
(10/24/2019, 2:54:04 PM): for All-Terrain T/A® KO2 your site says a pressure increase to 44psi but my 4runner manual says 32, which do i use ?
Porter T (10/24/2019, 2:55:38 PM): Use the 44 PSI. Since the KO2 is a bigger tire, it will require more air. the vehicle most likely came with a P metric, smaller tire thus the lower PSI. But since you changed to LT, thus you raise the PSI.
(10/24/2019, 2:55:52 PM): ok ty
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The "P" to "LT" is correct, and a bigger tire will hold more air. More air (volume) is not more pressure, though. Actually, a bigger tire can have a larger load rating at the same pressure. It has more air (volume) to hold up the weight, and doesn't always need more pressure, if they are both "P" or both "LT". In this case, switching from "P" to "LT" is the reason for the pressure increase.
If you went from one size "LT" tire to a larger "LT" tire, you could decrease the pressure and have the same load rating because you have more volume. Volume is constrained by the size of the tire, pressure is not. Volume holds up the truck, not just pressure.
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Last edited by AK Mule; 10-24-2019 at 03:50 PM.
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10-24-2019, 04:36 PM
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#40
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official vendor
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Join Date: May 2017
Location: Colorado
Posts: 48
Real Name: Andy
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Join Date: May 2017
Location: Colorado
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Real Name: Andy
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Something interesting that came to light recently on my partially armored 100 series (around ~400# heavier than a 5th gen 4R) is that the KO2s at recommended 44 psi are noticeably harsh for my wife. She kept getting car sick on medium to long trips and then suddenly was better on our way home from a trail run where I only aired up to ~32 psi. Tires were more noisy, but my wife was totally fine.
I tested it a few times after where I'd modify the pressure without telling her and see if she noticed. I thought it was a placebo effect or something. I was wrong, she could tell every time I raised pressures and never complained with pressures set lower.
I would have sworn there was no perceptible ride quality difference between the E rated KO2 and my other tires, but my wife has proven otherwise...
I now run my KO2's at around 33psi. Happy wife, happy life.
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10-24-2019, 06:05 PM
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#41
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Join Date: Dec 2015
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Quote:
Originally Posted by AK Mule
The "P" to "LT" is correct, and a bigger tire will hold more air. More air (volume) is not more pressure, though. Actually, a bigger tire can have a larger load rating at the same pressure. It has more air (volume) to hold up the weight, and doesn't always need more pressure, if they are both "P" or both "LT". In this case, switching from "P" to "LT" is the reason for the pressure increase.
If you went from one size "LT" tire to a larger "LT" tire, you could decrease the pressure and have the same load rating because you have more volume. Volume is constrained by the size of the tire, pressure is not. Volume holds up the truck, not just pressure.
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That's not how tires work.
Also you could definitely require a different pressure changing LT tire sizes depending on the load index.
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10-25-2019, 10:03 AM
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#42
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Join Date: Sep 2014
Location: Bunker Hill, Wv
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One of our Tire Reps recently went to a BFG/Mich tire testing expo and they actually talked about this. They asked all the attendee's if they went up in tire size and to a LT rated tire, if the stock pressure was 36ish psi where would they typically run the new LT tire....they all pretty much answered lower psi...and were promptly told that was incorrect. They now recommend MORE....they said it was to give the tire the proper footprint, but im still not sold on it lol
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10-25-2019, 10:42 AM
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#43
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Join Date: Oct 2016
Location: Durango, CO
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Location: Durango, CO
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Running 40 PSI
I have had my BFG AT K02s (265) on for 3 years (55K miles) and have kept them close to 40 psi. Tried a bit higher and that was too stiff and tires wanted to wander a bit) have also run them lower which is great on trails but too squishy (for me) at highway speed. 40 is the sweet spot for my daily use
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'16 4Runner Trail w/KDSS Barcelona Red, Dobinsons Lift (2.5F/1.5R), Dobinsons UCAs, SSO Slimline bumper, Smittybilt X20 Winch, RCI Aluminum Skids, RCI Rock Sliders, BFG AT K02 (285/70R17), APEX Rear Bumper
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10-22-2022, 11:48 AM
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#44
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Join Date: Oct 2022
Location: Sedona, AZ
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We got the BFG A/T LT KO2s and started them at 44 at the recommendation of the tire place because we were carrying a heavy load. Then taking them in to get balanced the shop put them at 38 psi and the ride became a nightmare, shaking and hopping all over the place. Saw on the bfgoodrich.com site today that for this tire THEY RECOMMEND 44 PSI in bold at the bottom.
It says, “Requires pressure increase to 44 PSI
These tires are different than specified on the tire vehicle placard. size requires an increase in inflation pressure to 44 PSI for proper and safe application. The PMS system will likely require re-calibration with
this inflation pressure adjustment, consult your vehicle manufacturer's representative for TPMS assistance/instruction. For tire assistance consult your MAST Dealer for more details.”
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10-22-2022, 12:25 PM
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#45
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Join Date: Oct 2022
Location: Sedona, AZ
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Here’s the screenshot of the bottom of the BFG website listing for the KO2 tires I mentioned, that shows the 44 psi recommendation for running them on the 4Runner. Hope this helps others get it right the first time! Wish we would’ve known earlier what 4 different shops didn’t know.
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