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Lowest pressure on a 30" tire


 
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ThePhantum
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PostPosted: Mon Feb 09, 2004 11:28 pm    Post subject: Lowest pressure on a 30" tire Reply with quote

So, someone clarify this for me...30"x9.5"x15" (BFG AT's) on 15"x8" rims on an XJ...what's the lowest I can go without running a high risk of losing a bead. I usually go down to about 18psi (I run at 32psi on the road), but would like to take 'em down to 12 or 13 on my next run. I realize that the tire is not much wider than the rim...but because the sidewalls are not that tall, do I really need to worry about popping a bead at that low a pressure?

Any thoughts, ideas as well as misinformed opinions are welcome. Mr. Green

Steve
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MonkeyBiz
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Joined: 09 Jan 2004
Location: Grand Haven Michigan

PostPosted: Tue Feb 10, 2004 1:21 am    Post subject: Reply with quote

12- 13 should be fine if you are just running sand, or rock.. IMO.. If you are going to be playing in mud and woodsy trail kinda stuff, I wouldn't go lower that say 20.. To easy to get shit stuck in there.

My .02 Twisted Evil
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ThePhantum
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PostPosted: Tue Feb 10, 2004 1:27 am    Post subject: Reply with quote

Yeah, I run mainly on rocky trails...there's a little swimming involved (creeks, rivers, etc.), but not a lot of mud at all...
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MonkeyBiz
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PostPosted: Tue Feb 10, 2004 1:58 am    Post subject: Reply with quote

IMO you will be fine with 12 - 13 PSI.. Just be easy with the stupid pedal. Mr. Green
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ThePhantum
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PostPosted: Tue Feb 10, 2004 2:03 am    Post subject: Reply with quote

MonkeyBiz wrote:
IMO you will be fine with 12 - 13 PSI.. Just be easy with the stupid pedal. Mr. Green


Nah...I floor it all the time! I like to keep it up at redline when in 4lo as often as possible!
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PostPosted: Tue Feb 10, 2004 2:23 am    Post subject: Reply with quote

Might well, 4 lo, you aren't spinning the tires that much. So ya should be okay. rofl
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PostPosted: Tue Feb 10, 2004 2:21 pm    Post subject: Re: Lowest pressure on a 30" tire Reply with quote

thephantum wrote:
So, someone clarify this for me...30"x9.5"x15" (BFG AT's) on 15"x8" rims on an XJ...what's the lowest I can go without running a high risk of losing a bead. I usually go down to about 18psi (I run at 32psi on the road), but would like to take 'em down to 12 or 13 on my next run. I realize that the tire is not much wider than the rim...but because the sidewalls are not that tall, do I really need to worry about popping a bead at that low a pressure?

Any thoughts, ideas as well as misinformed opinions are welcome. Mr. Green

Steve


Anyone have anything to add? Mr. Green
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moabe
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Joined: 08 Feb 2004
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PostPosted: Tue Feb 10, 2004 2:34 pm    Post subject: Re: Lowest pressure on a 30" tire Reply with quote

thephantum wrote:
thephantum wrote:
So, someone clarify this for me...30"x9.5"x15" (BFG AT's) on 15"x8" rims on an XJ...what's the lowest I can go without running a high risk of losing a bead. I usually go down to about 18psi (I run at 32psi on the road), but would like to take 'em down to 12 or 13 on my next run. I realize that the tire is not much wider than the rim...but because the sidewalls are not that tall, do I really need to worry about popping a bead at that low a pressure?

Any thoughts, ideas as well as misinformed opinions are welcome. Mr. Green

Steve


Anyone have anything to add? Mr. Green


you can run down at 11lbs and watch your turns into offcamber situations...i run 2psi in my sx's when on rock and 15psi when accidentally hittin mud and 25psi on da street...

ps, you may cut the sidewalls at 11psi if you encounter jagged rock in thatcase stay at 13psi
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kizer
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PostPosted: Tue Feb 10, 2004 5:25 pm    Post subject: Reply with quote

30-inch tires. This site http://www.sierrajeep.com/airing.htm
says its dependant on vehicle weight.

2000 9psi
3000 10psi
4000 12psi
5000 14psi

Personally I would believe the idea of weight and tire size would have a factor opposed to a wild guess. Then again the author of that site could of been making things up as he went along just the same. Wink
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ThePhantum
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PostPosted: Tue Feb 10, 2004 10:46 pm    Post subject: Reply with quote

kizer wrote:
30-inch tires. This site http://www.sierrajeep.com/airing.htm
says its dependant on vehicle weight.

2000 9psi
3000 10psi
4000 12psi
5000 14psi

Personally I would believe the idea of weight and tire size would have a factor opposed to a wild guess. Then again the author of that site could of been making things up as he went along just the same. Wink


True, but he also states "Rim width, tire construction, and weight distribution may necessitate the need for adjustments.".

I guess what I'd like to see is a chart or even a rough guidline of PSI adjustments (by percentage or something) based on the ratio of rim to tire width while factoring in the sidewall height....I know....it's a bit much to hope for... Mr. Green

Steve
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'drack
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Joined: 01 Jan 2004
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PostPosted: Wed Feb 11, 2004 6:52 am    Post subject: Reply with quote

I think you'd be safe at the 12~15 psi range and if you wanna experiment, trial and error is about the only way to find out. Depends on the wheeling. Slow and rocks and you can generally prevent a tire from blowing a bead if someone's spotting you and watching. Or just make sure you wheel with someone that has OBA Wink Mr. Green .
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moabe
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PostPosted: Wed Feb 11, 2004 7:19 am    Post subject: Reply with quote

thephantum wrote:
kizer wrote:
30-inch tires. This site http://www.sierrajeep.com/airing.htm
says its dependant on vehicle weight.

2000 9psi
3000 10psi
4000 12psi
5000 14psi

Personally I would believe the idea of weight and tire size would have a factor opposed to a wild guess. Then again the author of that site could of been making things up as he went along just the same. Wink


True, but he also states "Rim width, tire construction, and weight distribution may necessitate the need for adjustments.".

I guess what I'd like to see is a chart or even a rough guidline of PSI adjustments (by percentage or something) based on the ratio of rim to tire width while factoring in the sidewall height....I know....it's a bit much to hope for... Mr. Green

Steve


ya'll are makin this harder than it needs to be, just wheel it till the tire comes off, then put it back on and add 3psi??? Rolling Eyes
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