Airing down tires, 255/85/R16 - Page 2 - Defender Source
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  #21  
Old January 14th, 2016, 06:37 AM
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25-28 on road. If it's only a brief section if off road leave it at that but for long weekends etc 16-18

I can't imagine running at sidewall maximum pressure on road that would clearly result in fillings coming out and chiropractic treatments
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  #22  
Old January 14th, 2016, 07:33 AM
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good advise, but hopefully he has figured it out over the last 5.5 years...
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  #23  
Old January 14th, 2016, 09:10 AM
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good advise, but hopefully he has figured it out over the last 5.5 years...
Hah!
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  #24  
Old January 14th, 2016, 09:12 AM
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Quote:
Originally Posted by Rocky View Post
25-28 on road. If it's only a brief section if off road leave it at that but for long weekends etc 16-18

I can't imagine running at sidewall maximum pressure on road that would clearly result in fillings coming out and chiropractic treatments
Most of us run about 38-40psi on the road with BFG KM2 255s....25-28 I think would be a bit soft, that's a lot of sidewall to flex.
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  #25  
Old January 14th, 2016, 09:13 AM
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  #26  
Old January 14th, 2016, 09:13 AM
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Originally Posted by Iconoclast View Post
Lots of experience with this size tire. If your wheel width is 7 inches or less you can air down to 16 lbs on sand/gravel/earth surfaces with little issue unless your working at speed. But if your using 7.5 or wider wheels NEVER below 18 lbs or you will lose your bead even in a mild turn at any speed over 15mph. Beadlocks can get you to 10 psi without lose of bead but the tire becomes much more vulnerable to dmg and there are little gains below 13 psi on tires with this load rating.


A 6 year thread revival first post...

Either way, I ran 16psi during a 5 day event driving from trail to trail at up to 60mph, 8" wide wheel. Lots of turns. Never lost a bead.
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  #27  
Old January 14th, 2016, 09:50 AM
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The relationship between tire pressure and loaded weight is well known. There is a maximum weight limit for a given tire pressure. This is called the load limit. The maximum pressure marked on the tire, therefore, also gives the maximum load the tire can hold.

Under the maximum load, the only limitation that I've heard of on vehicles is one established by the CVSA, which is 50% of the maximum cold inflation pressure marked on the tire.

Arguing about tire pressure, therefore, is moot. It is purely subjective. There is no rule except that you should not exceed the load limit. CVSA says not to run under 50% max cold inflation pressure, but you could easily run under 50% depending on the speed because you're not a commercial vehicle. You can run the tire at 5psi, but it will probably unseat the bead easily.

If you have a poorly set up suspension and the shocks are way too stiff for comfort, then you can run the tires at low pressures to soften bumps.

Off-road, of course, you can do whatever you want pressure-wise. That is until you pop a bead or tear a sidewall. I'd rather pop a bead than tear a sidewall, however.

If anyone has newer guidance regarding minimum inflation pressure on the street beyond CVSA, I'd be interested in hearing it.
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  #28  
Old January 14th, 2016, 10:13 AM
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Ed- on that same trip running at 16psi all week -
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  #29  
Old January 14th, 2016, 10:15 AM
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Ed- on that same trip running at 16psi all week -
That's tragedy right there Every time I see one of those I make that "that's a $200 stick" face
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  #30  
Old January 14th, 2016, 10:20 AM
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Luckily it wasn't the stick that did it, or I would have been a bit more upset!

Coincidentally after getting off of the trail(and not being able to locate a spare for the rest of the VOT), our team happened upon a 110SW on the side of the road... the tires? 255/85s... That's how I met Josh(myoverlandrover)
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  #31  
Old January 14th, 2016, 10:27 AM
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hahah! great story!
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  #32  
Old January 14th, 2016, 11:07 AM
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Quote:
Originally Posted by nathanwind View Post
Most of us run about 38-40psi on the road with BFG KM2 255s....25-28 I think would be a bit soft, that's a lot of sidewall to flex.
Guess we should factor in spring rates. I reused the springs from my D1 which are pretty darned stiff leafspring stiff in the lighter 90. Softer sidewalls from lower pressure helps in my circumstance.
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  #33  
Old January 14th, 2016, 12:02 PM
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On the street I run 32 psi front and 30 psi rear.

The BFG's KM2s have tough sidewalls.. I've ran as low as 4 psi in snow with Beadlocks... but the magic pressures for me are 9psi in front and 8 psi rear for East Coast trails. In Moab I scared myself coming back down Moab Rim and had to air up to about 12 Psi for the rest of that trip.
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  #34  
Old January 14th, 2016, 12:10 PM
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Another thing to add: lower tire pressures = lower pumpkin.
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  #35  
Old January 14th, 2016, 12:39 PM
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Unless you're my brother. One year at the ROAV summer rally he was sliding all over the place. I asked him what pressure he was at, he said "dunno." I checked - 60psi!!!! He just filled up the tires until they felt hard.
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  #36  
Old January 14th, 2016, 12:45 PM
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Quote:
Originally Posted by bharris View Post
My 255/85 would burp like crazy if I went below 15... in a practical sense you can't really go below that without having seating issues on stock wheels
A few have experimented with gluing the bead to tye wheel with geat results if you insist on running 15psi.
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  #37  
Old January 14th, 2016, 01:05 PM
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Probably depends on the tires. I've regularly run 12 psi on 255/85 on the Defender and the Classic. I've never had a bead problem with TRXuS MTs or with ST MAXX on stock wheels.
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  #38  
Old January 14th, 2016, 01:40 PM
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Quote:
Originally Posted by david_jackson View Post
Just purchased BFG MT KM2s in 255/85/R16 for my '97 SW. For those of you with this tire, what do you air down to for trails/rocks, etc? What tire pressure do you run on the pavement?

Thanks
Guys, how about we go to the tire manufacturer's web site & let them tell us what is safe ??

Go to the BFG website, there's a spot there that talks about low pressure driving & max speeds. On the E rated AT's, I think it was a min pressure listed is 15psi and a max speed of 15mph at that pressure. I've driven down the highway @ 50mph on 22psi and it felt like I was pushing through mud. It was a 90 day in Moab and my tire temp was just under 130 after 10 miles of driving back to town. In town, I run 38psi on my AT/KO's E rated 235/85-16's. If I'm doing an all day highway drive I pump up to 45psi as I want to fully reduce my rolling resistance, still have somewhat of a soft ride and squeeze every MPG I can possibly get from a gallon.
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  #39  
Old January 15th, 2016, 09:38 AM
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There you go, even the manufacturer has all the minimum tire pressures totally quantified.
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  #40  
Old January 15th, 2016, 10:39 AM
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Originally Posted by sonoronos View Post
There you go, even the manufacturer has all the minimum tire pressures totally quantified.
Thanks to the massive financial exposure from the Firestone & Explorer rollover issue, attorneys (both mfr and insurance) are working to better protect their clients.
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