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Old 05-30-2008, 09:14 AM   #1
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Lowest Pressure without Beadlocks

Hello,

last weekend I was in an Offroad Park. With 15 psi everything worked fine. I only had a bit of sand between teh rim and the tire.
Because of that I used some tire glue (which is normally used on tractor tires) today.

Next time I want to air down a bit more for more traction, but I donīt want that the tires pop down from the rims.

What pressure will work fine without beadlocks?
I have 35x12.5x15 Cooper STTs on 8.5x15 rims.

Thanks for your help.
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Old 05-30-2008, 09:23 AM   #2
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Every tire/rim combination is going to be different... I know, I know not much help for you! I can tell you that I air down to around 10 pounds with black steel 15x8" wheels with 35x12.50 r15 Goodyear MTRs every time I go out on the trail (mostly rocks, little mud, no real sand) and have been doing that for about 8 years with several hundred trails run and have not lost a bead yet. Most guys that I wheel with that do not have beadlocks are hesitant to go below 10 pounds because of the risk of loosing a bead, which is definitely not fun on the trail!

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Old 05-30-2008, 09:24 AM   #3
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10 psi and pay attention. I always have good luck with that width tire on that width rim. There have been a couple times I burped some air and ended up at 6 psi but I never lost a bead.
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Old 05-30-2008, 11:01 AM   #4
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do you really think that 10 psi is enough? then iīll try that the next time.
i just aired down one tire from 26 (my street pressure) to 15 and then down to 15 psi and that looked like much more grip than before to me.

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Old 05-30-2008, 11:09 AM   #5
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I'm not the professional that Mr. C is However, I've been running 10 psi (not kilo pascals) on stock 15x8's with 33x10.5" tires and have not had any issues.
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Old 05-30-2008, 11:23 AM   #6
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10 psi and you should be good. I would drop below 10 though as you might see the tire slip or spin on the wheel. You could always put a chalk mark or grease pencil mark on the tire and wheel to see if the tire is moving on the wheel.
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Old 05-30-2008, 11:27 AM   #7
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the tire canīt move on the wheel. i used some glue between the tire and the rim. if the pressure is too low the tire will pop from the rim.
a friend who works at a tractor garage gave me that glue. he said they use it on all low pressure tracor tires.
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Old 05-30-2008, 01:55 PM   #8
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Does that glue work for small children?...just wondering.
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Old 05-30-2008, 02:01 PM   #9
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donīt you know that over there?

here ineurope nearly all tractor tires are mounted with this glue. my friend works at a john deere garage.
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Old 05-30-2008, 03:55 PM   #10
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On my new Comp Claws on 17's I ran them at 6.5 lbs over the weekend and never blew a bead. They are sitting on some 17x9 Pro Comp rims. My 35's Claws on my 15x10 Eagle Alloys like it at about 7.75 lbs. Only blew one bead in several hundred runs that way. It all depends on the tire and the rim. That glue might help you a little, but the pressure that it takes to pop a tire off the bead will be enough to separate it glue or not.
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Old 05-30-2008, 05:13 PM   #11
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only 6.5 psi? wow thatīs not much.

iīll first try it with 10 psi. thatīs less than i thought before.
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Old 05-30-2008, 06:06 PM   #12
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Quote:
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only 6.5 psi? wow thatīs not much.

iīll first try it with 10 psi. thatīs less than i thought before.
Yup, the Comp Claws have an 8 ply sidewall and don't flex out much even at 7.5. So I dropped'em a pound and it made a world of difference. However that being said that is for rocks. Trail running or mud you'd want them higher. I think 10 will work out fine for you.
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Old 05-30-2008, 08:34 PM   #13
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I think 8 to 10 psi might be best for radials, not because lower would cause a bead to blow but because you'd be alot more likely to pinch the folded sidewall between rocks and the rim.

with bias tires much stiffer thicker sidwall it can handle the pinches but also don't flex/fold as easily but they are super strong and won't cut easily either. I think it also depends on if you think you might get the jeep in tricky places where alot of weight from the jeep could get pushed onto a single corner - in those cases youd probably want 7 psi min.

I've been running at 6 psi up to last weekend and I think I will try 5 this weekend because it didn't seem to wrap or fold very well unless the tire was jamed tight between the bolders. I might regret it tomorrow but I'm going to risk it. Jack will remember the last time I tried 5 psi... it blew the bead when the weight was pushed onto a single corner.
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Old 05-30-2008, 08:54 PM   #14
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I run 10lbs on the trails with no problem, but as mentioned above I notice my tires tend to fold on rocks. So with this tire thats it. In my old Toyota I'd run 7-8lbs on BFG Muds and never had a problem. It depends on the tire. Last weekend I was following a guy with lockers who was having traction issues. He was at 15lbs and refused go lower. He was slipping much more than me and I have an LSD in back
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Old 06-05-2008, 03:00 AM   #15
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Quote:
Originally Posted by nicolas-eric View Post
donīt you know that over there?

here ineurope nearly all tractor tires are mounted with this glue. my friend works at a john deere garage.

I'd like to hear more about this glue, got a name brand or any other info on it ?

I can only air my tires down to 10psi and then they start burping, slipping, and busting beads.............
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Old 06-05-2008, 09:30 AM   #16
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I know 3M make it. I've seen it used at the tire shops.

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