Airing down tires, 255/85/R16 - Defender Source
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  #1  
Old May 24th, 2010, 01:20 AM
david_jackson
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Dave Jackson
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Airing down tires, 255/85/R16

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?

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  #2  
Old May 24th, 2010, 06:41 AM
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Run the maximum air pressure listed on the tire for street use. As for trail or rocks, it depends on terrain. If you are using the stock wheels, for dirt trails, I would say 15 - 20 psi, for rock, I would say 12 - 15 psi.

The stock alloy are pretty good at holding a bead, but you will still have to play with it a little for your specific tires. I used to run a 33x12.5 Superswamper SSR on my alloys, and I could run these pressures easily, on dirt and rock.

Having easy access to air or a Powertank (CO2) system helps too.
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Old May 24th, 2010, 08:34 AM
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[QUOTE=woldd90;222903]Run the maximum air pressure listed on the tire for street use.

Why this bad idea still repeats itself on the internet, I don't know. Your truck will ride like shit if you do this. MAX Rated tire pressure on the sidewall is not recomended pressure, 32 PSI is plenty. Just keep them even for best wear.
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  #4  
Old May 24th, 2010, 08:38 AM
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Quote:
Originally Posted by woldd90 View Post
Run the maximum air pressure listed on the tire for street use. As for trail or rocks, it depends on terrain.
I don't think that would be a good idea. I'd hate to ride around in an Defender with Load Range 'E' tires and 80psi in the them, not only will it be uncomfortable, but the handling will be poor, as will the tire wear. That tire is rated to support 3415 lbs at max pressure. I don't think even a heavily expedition equipped Defender 110 approaches 13,600 some lbs...

I would think you would be good around 34 to 36 lbs at most, and I trypically run as low as 12 psi off road on 285/75-16's with no issues..
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  #5  
Old May 24th, 2010, 10:13 AM
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Don Bunnell
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Quote:
Originally Posted by KevinNY View Post
Why this bad idea still repeats itself on the internet, I don't know. Your truck will ride like shit if you do this. MAX Rated tire pressure on the sidewall is not recomended pressure, 32 PSI is plenty. Just keep them even for best wear.
Yeah, I threw my SSR's on after the tire place mounted them and balanced. They had about 50 psi in there and felt like bricks. I shortly let a bunch of air out and now running them at 35 psi. With the stiff sidewall on them I'm sure I could go to the 32 psi you mention.

On the last trail I ran about 15 psi. I probably could go lower with the SSR's as the sidewall didn't move too much. But for the skinny BFG that would be a good starting point.
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  #6  
Old May 24th, 2010, 11:02 AM
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Brad Harris
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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
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  #7  
Old May 24th, 2010, 11:05 AM
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I've been running 35-psi for two-plus years on the same tire/size/vehicle. Overall wear has been excellent in my opinion. For trails however I air down to 15 and I've not popped a bead yet, thankfully.
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  #8  
Old May 24th, 2010, 11:44 AM
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I runs 35 psi on the street and 15 psi on the trail.
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  #9  
Old May 24th, 2010, 11:53 AM
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I run 40 on my 110
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  #10  
Old May 24th, 2010, 11:59 AM
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I run 24 lbs on the street with my SSR's, and about 8-10 on the trail.

------ Follow up post added May 24th, 2010 12:00 PM ------

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Originally Posted by Rugbier View Post
I run 40 on my 110
Yikes... how's that ride?
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  #11  
Old May 24th, 2010, 12:21 PM
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Daniel Marcello
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I have been having good luck with what Land Rover says to run the tires at. it is on the sticker by the footwell. I think its 28 front, 35 rear. I used to run 35 all around but am trying out this lower pressure in the front and so far it feel smooth.
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  #12  
Old May 24th, 2010, 01:22 PM
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i run 28psi front & 30psi rear, off road i go down to 12psi and end up about 6 on some with air loss
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  #13  
Old May 24th, 2010, 02:16 PM
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for both my 285 and the 255, I ran/run 40 on road, @ 18 - 22 off.
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  #14  
Old May 24th, 2010, 02:27 PM
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[QUOTE=KevinNY;222905]
Quote:
Originally Posted by woldd90 View Post
Run the maximum air pressure listed on the tire for street use.

Why this bad idea still repeats itself on the internet, I don't know. Your truck will ride like shit if you do this. MAX Rated tire pressure on the sidewall is not recomended pressure, 32 PSI is plenty. Just keep them even for best wear.
Why is this a bad idea? I run my SSR's at 35 - 40 psi with no problem, with 35's on 15" wheels, I prefer a stiffer side wall, since I have a pretty soft suspension. Running the stock alloys with a set of 33 SSR's, I usually ran 32 - 35 psi.


Quote:
Originally Posted by LRNAD90 View Post
I don't think that would be a good idea. I'd hate to ride around in an Defender with Load Range 'E' tires and 80psi in the them, not only will it be uncomfortable, but the handling will be poor, as will the tire wear. That tire is rated to support 3415 lbs at max pressure. I don't think even a heavily expedition equipped Defender 110 approaches 13,600 some lbs...

I would think you would be good around 34 to 36 lbs at most, and I typically run as low as 12 psi off road on 285/75-16's with no issues..
Why would you run an E load tire on a Defender? My truck fully set up only weighs about 4500 lbs. I run E load on 2500 series Yukon XL because I use it for towing. I run those at 45 - 50 psi around town and 65 psi towing.
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  #15  
Old May 24th, 2010, 02:36 PM
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Because the spec MAX inflation on a 255/85-16 BFG KM2 is 80 PSI.
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  #16  
Old May 24th, 2010, 03:03 PM
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Land Rover is like a buick compared to my lotus as far as harshness of ride goes. I run E load range tires in the 40-35psi range although I think my D90 currently has D not E load range BFG Ats.
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  #17  
Old May 24th, 2010, 03:20 PM
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Chris Davis
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I run 30-32 psi for road on my 255/85/16 BFG MT/KM2. I run 12-14 on the trail.
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  #18  
Old May 24th, 2010, 04:13 PM
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Quote:
Originally Posted by woldd90 View Post
Why would you run an E load tire on a Defender? My truck fully set up only weighs about 4500 lbs. I run E load on 2500 series Yukon XL because I use it for towing. I run those at 45 - 50 psi around town and 65 psi towing.
I don't believe the 255/85-16 BFG M/T KM2 comes in any other load range..
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  #19  
Old May 24th, 2010, 08:28 PM
david_jackson
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Thanks everyone for your replies and expertise. From reading your replies I think I have a good idea about what pressures to run. Off to the moutains this weekend.
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  #20  
Old January 14th, 2016, 05:53 AM
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255/85r16 Air Down

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.
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