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11-06-2019, 05:45 PM
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#11
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Senior Member
Join Date: Apr 2011
Location: Oregon Ciry Oregon
Posts: 2,854
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Trial and error. I ran them around 75 psi for a while and the van felt like it was bouncing down the road. Dropped the pressure down to around 6p all around and then settled on 55/60. It rides comfortably and handles well at freeway speeds with those pressures.
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Larrie
Read detailed trip reports, see photos and videos on my travel blog, luinil.com.
Current van: 2002 Ford E350 extended body camper with Colorado Camper Van pop top and Agile Offroad 4WD conversion.
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11-06-2019, 07:23 PM
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#12
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Senior Member
Join Date: Apr 2016
Location: Oregon
Posts: 1,186
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Thanks. I'll give that a try.
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"PhoTo" - 2014 Ford E350 5.4L RB - Agile 4x4 - CCV Poptop
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11-09-2019, 11:45 AM
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#13
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Senior Member
Join Date: May 2007
Location: Beaverton, OR
Posts: 2,506
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Quote:
Originally Posted by Otter
Larrie, I’m interested in how you decided on those numbers (55/60 pavement). I have the 285/17 KO2’s and have been trying to determine what a softer-but-safe pavement ride should be be. I’m at about 7500 lbs, almost evenly distributed front and rear (rear = +50).
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This is a tire pressure calculator that is based off of information you can find on the tire ( Range, Index,rating) and front and rear axle weights. It also has a margin field, this is generally a good place to start.
-greg
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-greg
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"Goldilocks" 2020 Ford Transit High Roof Extended 3.5 EcoBoost AWD Homebuilt
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11-09-2019, 07:42 PM
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#14
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Senior Member
Join Date: Apr 2016
Location: Oregon
Posts: 1,186
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Thanks Greg. It looks like I’ll need to open this on something other than my IPad. Will give it a look when I get to my Mac.
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"PhoTo" - 2014 Ford E350 5.4L RB - Agile 4x4 - CCV Poptop
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11-10-2019, 10:06 AM
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#15
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Senior Member
Join Date: Nov 2016
Location: Oregon South Coast
Posts: 189
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Slow Down and Air Down.
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11-10-2019, 11:46 AM
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#16
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Senior Member
Join Date: Mar 2013
Posts: 4,244
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Quote:
Originally Posted by Scalf77
This is a tire pressure calculator that is based off of information you can find on the tire-greg
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Could you please explain what "margin" refers to? Thanks.......
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Arctic Traveller
KC6TNI
2001 GTRV
Advanced 4wd
Agile Ride improvement package
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11-10-2019, 11:49 AM
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#17
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Senior Member
Join Date: Apr 2011
Location: Oregon Ciry Oregon
Posts: 2,854
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Greg, Thanks for posting this. It shows I am a little under aired on the rear. Will stop by the scales the next time I fully load it to verify the weights. Lucky there is a state run scale a couple of miles away that is on my way out of town.
__________________
Larrie
Read detailed trip reports, see photos and videos on my travel blog, luinil.com.
Current van: 2002 Ford E350 extended body camper with Colorado Camper Van pop top and Agile Offroad 4WD conversion.
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11-10-2019, 12:15 PM
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#18
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Senior Member
Join Date: May 2007
Location: Beaverton, OR
Posts: 2,506
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Quote:
Originally Posted by arctictraveller
Could you please explain what "margin" refers to? Thanks.......
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Margin is a percentage of the per tire rate based off of axle weight, so if you want 10% margin than it will add 10% of the weight to the tire position, and increase the suggested air pressure. So setting to zero just calculates off of the axle weights. I normally give myself 10% margin, I think the tool had 20 as the last input I tested.
So it is just as safety factor that you can add in, to the equation.
greg
__________________
-greg
__________________________________________________ ______________
"Goldilocks" 2020 Ford Transit High Roof Extended 3.5 EcoBoost AWD Homebuilt
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11-10-2019, 01:06 PM
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#19
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Member
Join Date: Apr 2017
Location: Ouray, CO
Posts: 59
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Shaking and rattling were the biggest problem with taking our 4x4 SMB off-road or on washboard roads. At the Overland Expo in Flagstaff I saw a solution at the Agile Off-road booth. They showed me the new “bead grip” wheels by Method which help keep the tires from debeading when aired down.
I bought a set of those wheels and based on advice from Agile I now air my 7500 pound van with BFG KO2s down to 25 to 30 psi on washboards. The lower the pressure, the less my expensive SMB gets shaken apart.
I air back up quickly for the highway using an ARB twin compressor.
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12-13-2019, 11:38 AM
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#20
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Member
Join Date: Dec 2013
Posts: 42
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We spent a week in Utah's San Rafael Swell on sandy roads with about 20 psi. Not only more comfy but we made it across some deep sand when I bet we would have gotten stuck with firmer tires. I just searched and saw a Jeep thread that had many guys running 10 psi without "beadlock" or any special rims.
Of course a Wrangler weighs a LOT less than my Sprinter so maybe 10 vs 20 is about right.
Ney
Fifty Classic Adventures – Epic Journeys for Active Families
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