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Old 10-16-2019, 05:25 PM #16
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Well hell, I was running my 285 C's at 36 and was getting wear in the middle significantly, so I went down to 32. Not sure if going to 40 will help at all.
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Old 10-16-2019, 05:52 PM #17
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Originally Posted by mteolus View Post
Well hell, I was running my 285 C's at 36 and was getting wear in the middle significantly, so I went down to 32. Not sure if going to 40 will help at all.
Funny, I was getting inside hi lo feathering wear on the fronts and was at 32 on my 265 C's. I was also getting a lot of road noise and felt like I was driving on suction cups. I also thought I was getting some stress on the diffs and transmission, but that might just have been more tire noise. 44 was hard to swallow, but the math added up. I'm at 40 now and will run that for a while to see what happens. First impression is a better, but bumpier ride, which I'm ok with since it is a 4runner and not a luxury cruiser!

I would look at the inflation chart for the 285's, it might be different!

Heres a link: https://www.toyotires.com/media/2125...s_20170203.pdf
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Old 10-16-2019, 06:05 PM #18
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FWIW, I have 275/70R17 KO2's on my 4Runner. I don't have any aftermarket parts that add weight, and I don't drive around with 400 pounds of gratuitous gear in it. For daily driving with just me as payload, I run 41 PSI up front and 38 in the rear. I find that seems to keep the rear end feeling a bit more planted on uneven/bumpy roads.

When I load up (for example, recently did a 2000 mile road trip with 3 adults and all our stuff in the car) I had them at 44 PSI all around and they felt good, were rock solid and didn't seem overly stiff/harsh. I estimate I had 800-850 pounds of payload at that time. Felt a bit harsh at 44 with just my 155 pound backside in the driver's seat.
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Old 10-16-2019, 06:13 PM #19
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Quote:
Originally Posted by 4Regrets View Post
FWIW, I have 275/70R17 KO2's on my 4Runner. I don't have any aftermarket parts that add weight, and I don't drive around with 400 pounds of gratuitous gear in it. For daily driving with just me as payload, I run 41 PSI up front and 38 in the rear. I find that seems to keep the rear end feeling a bit more planted on uneven/bumpy roads.

When I load up (for example, recently did a 2000 mile road trip with 3 adults and all our stuff in the car) I had them at 44 PSI all around and they felt good, were rock solid and didn't seem overly stiff/harsh. I estimate I had 800-850 pounds of payload at that time. Felt a bit harsh at 44 with just my 155 pound backside in the driver's seat.
This all makes great sense. I noticed my tires are much cooler to the touch than they were when running 32. Here's the only caveat I see and probably why they were engineered with P tires, not LT.

I would assume that since you have to raise the pressure to get the load rating, the ride will be firmer/harsher. I then assume that the increase in harshness is transmitted to all other suspension components. So you have to ask yourself, if you are going to upgrade to LT tires, shouldn't you upgrade your suspension to handle the extra harshness? Or, do you just accept that your components will wear out quicker? Or, just stick with some burly P rated tires?
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Old 10-16-2019, 06:28 PM #20
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Originally Posted by hwnrunner View Post
Im similar at 40 on 275/70/17 E. Tried 42, tried 44, ride gets very stiff for me up there. 40 seems to be the sweet spot.
Ditto, same tire size and running 40 PSI feels like the sweet spot for both wear and driving comfort on pavement.
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Old 10-16-2019, 10:44 PM #21
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I recently replaced the OEM rubber on my ‘18 SR5 with BFG All Terrain T/A KOs as well. I had load range E spooned on in OEM size. I also saw the recommended 44psi pressure on BFG’s website. My tire dealer also pressurized them to 44. So far I’ve kept it there, and haven’t noticed any real differences in ride or tire impact due to rough surfaces. I asked the installer about this and he said he thinks they would do fine with lower pressures on the street.

On my previous 2002 Tacoma TRD I also ran two sets of BFG’s in OEM size (LT265/70R16), also load range E. The tire dealer always aired them up to 35psi for the road and I found altering that pressure brought on negative wear and ride issues. Never had any wear issues at 35. Always lowered pressures on the dirt, usually 16-20. Not sure of weight specifications between the Tacoma and my 4Runner.

EDIT: Just Googled and found my Tacoma weight roughly 3515#; my 4Runner roughly 4500#.
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Old 10-17-2019, 12:21 AM #22
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Quote:
Originally Posted by ColoradoToyota View Post
Ditto, same tire size and running 40 PSI feels like the sweet spot for both wear and driving comfort on pavement.
Same here: I ran 265/70-17 C-rated KO2s at ~38 PSI for 30K miles, and got even wear and great driving performance on highway. Now I'm running 275/70-17 E-rated KO2s at 40 PSI, and am getting almost the same feel on the road.
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Old 10-17-2019, 09:41 AM #23
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Same here: I ran 265/70-17 C-rated KO2s at ~38 PSI for 30K miles, and got even wear and great driving performance on highway. Now I'm running 275/70-17 E-rated KO2s at 40 PSI, and am getting almost the same feel on the road.
I looked it up yesterday and there is a difference in the 265 vs. 275 load rating/inflation. I believe the 275 landed between 35-40psi and the 265 was at 44psi. I linked the Toyo load tables / instructions in a post above. It seems to agree with BFG pressure.
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Old 10-17-2019, 10:22 AM #24
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Originally Posted by Jivewalker View Post
Funny, I was getting inside hi lo feathering wear on the fronts
Inside feathering is more commonly associated with negative camber wear than tire inflation. I had to get several alignments over the life of my KO2s.
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Old 10-17-2019, 10:36 AM #25
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Inside feathering is more commonly associated with negative camber wear than tire inflation. I had to get several alignments over the life of my KO2s.
Agree 100%, just had the alignment done as well as tires re-balanced. I wasn't very far out, at least existing vs. corrected. I'll post what they were later. I don't know what correct numbers look like, just if they are green, yellow, red. guess I need to read up on that.

I could tell from feel that 32 was to low. I could feel and hear the stress on the diffs and transmission (vibrations, bearing noise) and the tires were warm/hot, which I though was normal. at 40, I'm not feeling the stress (vibrations, bearing noises) as much if at all.
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Old 10-17-2019, 06:17 PM #26
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I toyed with 40psi, and 38psi initially, but now run 43psi in my 275/70/17's and have been very pleased with mileage/wear/noise, personally. To me, 38 was way too spongy, and 43 seems to be my sweet spot for efficiency's sake.

Last fill up I topped 18.1mpg of about 80% hwy/20% city for that tank. Might've had a slight tailwind on the highway as I usually see high 17.X's mpg on the same stretch, but could've done better with cruise instead of aggressive passing that day ;)

When off road if I air down at all it is no lower than 36psi, but even then that is IF I air down. Most times I don't and have no problem driving in/out of ranch roads, river roads, and muddy surfaces.
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Old 10-17-2019, 07:55 PM #27
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I was also surprised when I ran into another thread about this with the KO2s. I found 40ish to be good.

I installed an aftermarket head unit which shows me PSI and temp in 10sec updates. I found that after I've started airing down (sometimes 18psi or lower for snow) and airing up again, not having the nitrogen fill makes PSI fluctuate ~2PSI up or down for every 10Deg. F in temp change. So if I fill to 38 at 40F when it was cold, but the time the tires heat up either from sun or driving I'm at 42 or so by the time my tires get up to 70.

On pavement 40-42 feels stiff, but handles well and I'm pretty sure helps with the milage. I remember when I first got the KO2s I thought someone at Costco messed up and deflated back to 32 and immediately noticed it felt very mushy and unstable, even at street speeds. I guess the point is that while there is an optimal PSI, you will still have SOME variance between temp, road conditions, weather, elevation, etc.
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Old 10-17-2019, 07:59 PM #28
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Sorry if this was already posted. I've been reading the tire pressure threads, well a lot of them, and I decided to go to the BF Goodrich site and was surprised by the disclaimer right on the page for my stock tire size. It says clearly that I need to raise my inflation pressure to 44psi. I have been running 32psi. Don't remember ever seeing this before when I bought my tires many miles ago. Check it out.

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Awesome, I'm validated! I installed 265/70-17 AT-KO2s with 118 miles on the odo, and I had them inflated to 44psi. I had hand calculated the change from SL to LT-C using tire load charts. That was about 4500 miles ago, and I don't see any abnormal wear on the tires.
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Old 10-17-2019, 08:03 PM #29
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Lowered mine to 10psi for last March’s Bomb Cyclone
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Old 10-17-2019, 08:06 PM #30
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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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Last edited by Jivewalker; 10-17-2019 at 08:09 PM.
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