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Unread 10-14-2008, 06:13 AM   #1
TJeep_1999
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What Tire Pressure on/off road???

What tire pressure should I be running with 31x10.5xR15 tires? What should I air them down to when going off road? Not sure that it matters, but I have a TJ. Thanks!

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Unread 10-14-2008, 06:24 AM   #2
BlackBellamy
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Personally I ran those tires at 28-30 on road, 12-14 off. Search this forum for "chalk test" - your pressure will depend on comfort vs mpg vs tire wear so pick your own pressures.
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Unread 10-14-2008, 07:26 AM   #3
daveshan
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Testing them yourself (chalk test) is the only way to determine a good street pressure.

Tires vary in sidewall stiffness greatly and tread width/rim width make a difference also. My BFG ATs on 15x8" rims need 24psi +- on the street, the Maxxis Creepy Crawlers on 15x 10" rims run on the center lugs only at anything more than 16psi.

Off road a bit of experimentation will show you what works best. If you post tire brand and rim width someone may have a similar set and can give you a baseline.
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Unread 10-14-2008, 07:31 AM   #4
JFranko
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I guess I'm running mine a little high compared to everyone else, I'm running 32" bfg mts at 35 psi, and they wear pretty even
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Unread 10-14-2008, 08:17 AM   #5
Whybu1
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Can't say for on-raod pressure in a 10.5 but the chalk test works well. Off-road you need to go down to at least 12 to really get any benefit.
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Unread 10-14-2008, 08:26 AM   #6
TJeep_1999
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Quote:
Originally Posted by daveshan View Post
Off road a bit of experimentation will show you what works best. If you post tire brand and rim width someone may have a similar set and can give you a baseline.
I'm running 31 x 10.5 BFG ATs on 15x8" rims... Thanks for all the advice. I think I have a pretty good idea now. I always worry that I air down too much and will loose a bead. I think 12-15 and I should be fine. Thanks agian!
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Unread 10-14-2008, 09:50 AM   #7
daveshan
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Sounds about right, I used to run BFG ATs in the 33x10.5 size on Eagle 7" wide rims and ran 11-12psi on trails with no issues, 25psi was about right for street use.
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