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  #1  
Old January 19th, 2021, 21:42
BALTANAKT BALTANAKT is offline
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Minimum tire pressures

Hey guys,

Curious what minimum tire pressure is safe for some 31" Duratracs on the original 5-spokes?

We got stuck in some snow the other day and I aired down to 15psi just to get unstuck. Thought I could perhaps have gone down to maybe 10, but did not want to risk a de-bead.

What are your thoughts?

Thanks!
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Old January 19th, 2021, 22:37
Black1990jeep Black1990jeep is offline
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Re: Minimum tire pressures

There are tire calculators that take into account the vehicle weight, rim diameter, and the tire width in addition to diameter of the tire.

For me 33x12.5 Wrangler MT tires on 15 inch rims I will go to 12 psi (warm tire) on moderate trails, but my calculator says it can be as low as 9 psi.(cold tire)

For you, what width tire, what diameter rim, what weight?

Off the top of my head 10 psi might be at the lower limit as generally smaller tires need more minimum pressure, larger dia rims also need higher pressure than smaller rims.

https://parksoffroad.com/prodreview/...asis/oasis.htm

the link shows the calculator I have, thats were I got my data. I also have the Oasis auto deflators, which are really well worth it.
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Old January 19th, 2021, 22:39
Black1990jeep Black1990jeep is offline
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Re: Minimum tire pressures

ps sure you can go lower than the calculator, but then the risk of tire coming off the rim may increase.
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Old January 20th, 2021, 06:41
RCP Phx RCP Phx is offline
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Re: Minimum tire pressures

I've been running 12 in front with 10 in the rear forever.
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  #5  
Old January 20th, 2021, 12:39
BALTANAKT BALTANAKT is offline
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Re: Minimum tire pressures

Quote:
Originally Posted by RCP Phx
I've been running 12 in front with 10 in the rear forever.
Whats your wheel/tire setup?

Quote:
Originally Posted by Black1990jeep
what width tire, what diameter rim, what weight
Tire Width: 10.5"
Tire Diameter: 31"
Wheel Width: 7"
Wheel Diameter: 15"
Curb Weight: 3,357 lb
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  #6  
Old January 20th, 2021, 14:12
RCP Phx RCP Phx is offline
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Re: Minimum tire pressures

I'm running 265/75/16 Duratrac's.
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  #7  
Old January 21st, 2021, 16:53
BALTANAKT BALTANAKT is offline
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Re: Minimum tire pressures

Well, so far seems like 12psi might be a smart limit based on what I'm reading here.
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  #8  
Old January 21st, 2021, 22:06
Black1990jeep Black1990jeep is offline
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Re: Minimum tire pressures

Quote:
Originally Posted by BALTANAKT View Post
Whats your wheel/tire setup?



Tire Width: 10.5"
Tire Diameter: 31"
Wheel Width: 7"
Wheel Diameter: 15"
Curb Weight: 3,357 lb
Based on your info above the tire computer says.....

9 psi at 3000 lbs weight, 10 psi at 4000 lbs.

Speed shall be limited to 20 mph, add 3 psi for each 10 mph over 20 mph.
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