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Old 01-05-2022, 09:46 AM   #1
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Gravel road tire pressure?

2009 extended e350, 245 75 16 bfg ko2, 2wd, 5.4

what should i air down to for gravel rutted roads?

Thanks all!!

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Old 01-05-2022, 10:30 AM   #2
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Quote:
Originally Posted by happycampingcouple View Post
2009 extended e350, 245 75 16 bfg ko2, 2wd, 5.4

what should i air down to for gravel rutted roads?

Thanks all!!
No way to accurately answer that without knowing how much weight is on front/rear axles (need scale tickets!) and the ply rating of your tires.
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Old 01-05-2022, 10:40 AM   #3
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Understood. The van is probably 7000 lbs and 10 ply tires
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Old 01-05-2022, 05:16 PM   #4
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OK, I don't do any rock crawling, but have been down some pretty rough forest service roads, etc. Lots of washboard roads also. Maybe I'm crazy (likely), but we only aired down once in 13 years and 175,000 miles.
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Old 01-05-2022, 05:19 PM   #5
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Drop them to like 20-25. Much smoother ride, less slipping (which then creates less washboard). You don't have to do it, but it will be noticeably more pleasant ride.. I do it if I'm going to be on a dirt road for a while. If I'm ducking into a campsite and on dirt for 30 mins I'll skip it:
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Old 01-05-2022, 09:20 PM   #6
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Awesome. Thanks for the info!!
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Old 01-06-2022, 04:22 PM   #7
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Lower pressure will definitely improve the ride over rough roads, reduce the possibility of a puncture and increase traction too. The lower you go, the better results. Some that do extreme off roading will go down as low as the mid teens or less (search for Chris Ridgway to see some of his adventures in his Agile TTB van) There are some caveats though. First, if you go too low you can cause the tire bead to come off the rim. Secondly you need to have a way to air them back up when you get to the pavement because you don't want to run regular road speeds with low pressures as it can cause the tires to possibly over heat. Having said all that, I'll routinely run pressures in the 20's off road. As far as what to run on pavement, there is no reason to run the maximum pressure listed on the tire unless you are at the tires maximum weight rating. Here is a good reference. https://tirepressure.org/
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Old 01-06-2022, 09:51 PM   #8
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My van is a 7.3 on 35” tires but I run 20# usually off road, will drop lower if needed
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Old 01-08-2022, 07:43 AM   #9
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With that size tire you can go to the tire pressure charts and determine what psi according to the weight on the tires.

My 08 E350 hightop has same size tires you list and wt is 3600# rear and 3000# front mostly empty with half tank gas. I use 80% rule so I'm about 40 front and 50 rear, I could go lower by 5-10 psi.
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Old 01-13-2022, 10:45 AM   #10
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I have my Staun tire deflators dialed in at 35. Takes the bump out of the road which helps keep the mdf cabinetry from rattling to pieces...
May try going down a bit based on what others are bringing theirs down to.
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