Tires, How low can they go? |
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smfulle
Member Sponsor Member Joined: 16 Sep. 2010 Location: Ogden, Utah Status: Offline Points: 6141 |
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Posted: 12 Feb. 2014 at 3:17pm |
Getting ready to go to Southern Utah for some slick rock trail riding. I have new Cooker NDT tires and tubes mounted. Anyone have any insight as to what the lowest tire pressure I can safely run?
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rocnroll
Member Sponsor Member Joined: 20 July 2005 Location: Tuscumbia, AL Status: Offline Points: 13585 |
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I never run more than 20 in NDTs because the are so stiff anyway.
That's just me.....opinions will vary. |
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'47 CJ2A PU
'48 CJ2A Lefty "Common sense is not that common" |
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bkreutz
Member Sponsor Member Joined: 17 Oct. 2006 Location: Fruitland Idaho Status: Offline Points: 7037 |
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If they've been mounted for a while you could probably let all the air out and not notice much of a difference. (at least on 6 ply's like mine
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smfulle
Member Sponsor Member Joined: 16 Sep. 2010 Location: Ogden, Utah Status: Offline Points: 6141 |
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We are planning on hitting this trail, but not attempting the more challenging obstacles. I'll be driving around most stuff, but hope to take a few things on that I can do safely in a stock 2A. So there will be some rock climbing like activity, and some bumps that I want to soften up if possible.
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jpet
Moderator Group Sponsor Member x 5 Joined: 30 Apr. 2008 Location: Ramsey, IL Status: Offline Points: 11173 |
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I have run my NDTs as low as 10 and they ride awesome but then you will need to air them up before you hit the highway. On the FCT, I will drop them to 20. They feel pretty good off road, but I can still drive on the highway. At 20 lbs, you can feel the difference on the highway but it is well within control.
Some have told me that if you run your tires at 10 psi, you run the risk of the tire spinning on the rim and perhaps cutting the valve stem but I have not experienced this. I only did it for 2 days of trail riding and then aired them back up before hitting the highway. |
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CJ2A #29110 "General Willys"
MB #204827 "BAM BAM" "We do what we can, and we try what we can't" |
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bretto
Member Joined: 05 June 2010 Location: Orem, Ut Status: Offline Points: 1930 |
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I wish you could pick me up on the way down. :(
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smfulle
Member Sponsor Member Joined: 16 Sep. 2010 Location: Ogden, Utah Status: Offline Points: 6141 |
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Bretto,
Only going to be in the 70's down there this weekend. I don't know if you could stand it.
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F Bill
Member Sponsor Member x 2 Joined: 05 Dec. 2005 Location: central Texas Status: Offline Points: 7752 |
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How many ply rating are those Cokers?
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If you haven't checked out the tech FAQ section, go to:
http://www.thecj2apage.com/forums/tech-faq_forum57.html for a lot of great stuff you need to know!! |
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smfulle
Member Sponsor Member Joined: 16 Sep. 2010 Location: Ogden, Utah Status: Offline Points: 6141 |
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Well, neither Coker or Summit Racing, from whom I bought the tires give an actual ply rating other than "bias ply". I suppose it might say something on the tire itself, but I don't remember. I'll check it this evening.
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Metcalf
Member Sponsor Member Joined: 21 May 2009 Location: Durango, Co Status: Offline Points: 736 |
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Moab in a flat fender is a BLAST!
The tubes kinda complicate things, but on 15 and 16" rims the bead lip is still the same as a tubeless tire correct? The only thing to really watch out for is spinning the tires in the rim. You don't really see that happen too often at 10psi and above. 5-10psi I have seen it happen on new rims with smooth bead lips, espeically chrome steel rims. If your still running manual steering you probably don't want to go much below 10psi. I would start at 15psi and go towards 10psi as you feel more comfortable with it. If you can, you might grab a spare tube to take with you. I would imagine that shops in town might have one....but it could come in handy out on the trail too worst case. I wish I could get over there this weekend! This thread needs a picture of a flat fender in moab..... Have fun, stay safe.
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42 MB that had a one night stand with a much younger 69 CJ5 and a 50s GM truck.
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smfulle
Member Sponsor Member Joined: 16 Sep. 2010 Location: Ogden, Utah Status: Offline Points: 6141 |
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Metcalf, we're actually going to SouthWEST Utah, St George area. Lot of family there so free lodging. Same red rocks though not quite so famous as Moab.
Don't think I'll take on things in my stock rig that you do in your flat fender on steroids rig, especially since I am really a novice driver. I'm really pumped about this trip. Doesn't compare to your adventure to the snow fields, but this will be my first time on anything other than dirt and mud. Here's a video from the trail we are going on. It's not a flat fender and I won't be trying this obstacle, but you can see there is some challenging spots there.
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Metcalf
Member Sponsor Member Joined: 21 May 2009 Location: Durango, Co Status: Offline Points: 736 |
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Cool! I have wanted to head down that way. I am driving over to the Rubicon trail this June so I might just have to stop in that area and poke around.
Wheeling is wheeling. I spent a lot of my youth in a bone stock flat fender getting into just as much trouble as I do now! You'll have a blast. |
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42 MB that had a one night stand with a much younger 69 CJ5 and a 50s GM truck.
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jeeper50
Member Sponsor Member Joined: 01 Mar. 2008 Location: Spanish Fort AL Status: Offline Points: 2579 |
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i run mine offroad and around town at 15lbs.
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Belleview ol skool winch soon. '48 CJ2A 283 V8 sm 420 granny low, tera low D18, overdrive,lockers Texan at heart,Alabama by retirement |
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Carlsjeep
Member Joined: 15 Jan. 2011 Location: Taylorsville Ky Status: Offline Points: 2642 |
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Stan, you may be surprised at just what your stock Jeep will do. Use 15 to 20 psi and it would help to have a Lock Right in the rear axle. But that won't happen this trip unless it's already in it.
BobW told me some of the 16" rims have a lip like the tubeless rims do and they hold the tire on better. When climbing, the approach you take to the hill and rock is most important.
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Life is only as good as you make it.
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Joe Friday
Moderator Group Sponsor Member x 2 Joined: 26 Dec. 2010 Location: Jeep Central Status: Offline Points: 3654 |
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Ditto on what Carl said, 15-20 psi.
Your wheels probably don't have safety humps in the bead area.
Regardless of whther the tires are 4 or 6 ply rated they are likely 2 ply Nylon.
I've dome most of the Moab trails in a stock 3B including tire test hill and lionsback, buy did not do challenges like Mickey's hot tub or the escalator due to probable body damage.
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jpet
Moderator Group Sponsor Member x 5 Joined: 30 Apr. 2008 Location: Ramsey, IL Status: Offline Points: 11173 |
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BTT
My question is, has anyone actually spun a tire or ripped a valve stem because they aired down too much? If so, how low did you air down to? I'm talking tubes of course. It just seems to me that 15 psi is not low enough to gain significant traction.
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CJ2A #29110 "General Willys"
MB #204827 "BAM BAM" "We do what we can, and we try what we can't" |
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rocnroll
Member Sponsor Member Joined: 20 July 2005 Location: Tuscumbia, AL Status: Offline Points: 13585 |
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I would go 8 to 10.....but like stated above opinions will vary.
Never spun a valve stem out of a tube (but that is all based on 4 cylinders) |
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'47 CJ2A PU
'48 CJ2A Lefty "Common sense is not that common" |
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jpet
Moderator Group Sponsor Member x 5 Joined: 30 Apr. 2008 Location: Ramsey, IL Status: Offline Points: 11173 |
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CJ2A #29110 "General Willys"
MB #204827 "BAM BAM" "We do what we can, and we try what we can't" |
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