Tires, How low can they go? |
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jaksjep
Member Joined: 03 Nov. 2013 Location: Southern CA Status: Offline Points: 471 |
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Posted: 03 Mar. 2016 at 6:41am |
Contact the tire manufacturer and see what they say???
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My posts are my personal opinion and are not legal advice as I am not an attorney. If you act on any of my comments you do so at your own risk.
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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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willys54wagon
Member Joined: 24 July 2008 Location: Ames, IA Status: Offline Points: 1444 |
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If you read through the pictures here you will see dash instructions of 7 lbs for entering and leaving water, but you knew that from past experience? I would assume the military had done some research on low tire pressure. Edited by willys54wagon - 02 Mar. 2016 at 1:28pm |
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Two jeeps on the road, one is close and the rest are dreams.
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Joe Friday
Moderator Group Sponsor Member x 2 Joined: 26 Dec. 2010 Location: Jeep Central Status: Offline Points: 3633 |
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Jeff- go ahead and run 8 but watch your footprint. Bias tires "oil can" and you will lose traction because the centerline lifts. also, for Moab you don't want to lose axle clearance by airing down too much. It makes the steps harder and you loose grip on side slopes.
I've done 'tire test hill' at 35 psi in 2wd. there is a ton of hype out there.
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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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Thanks for the input guys. I know there are lots of variables what I am looking for is testimony from someone who has actually tore up a tube because they aired down too low ..... other than a flat
..... or testimony from those who have aired down tubes below 10 lbs with success. Edited by jpet - 02 Mar. 2016 at 1:25am |
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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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Mark W.
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Keep in mind a stock running sad Willys Jeep will climb a hill if it keeps traction steep enough to flip one over. SO if you have no roll bar/cage you best be careful.
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Chug A Lug
1948 2A Body Customized 1949 3A W/S 1957 CJ5 Frame Modified Late 50's 134L 9.25"clutch T90A D18 (1.25") D44/30 flanged E-Locker D25 5.38 Since 1962 |
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Mike S
Member Joined: 20 May 2006 Location: West Coast Status: Offline Points: 2318 |
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A lot depends on the weight of your vehicle, type of tires, and the surface you are driving on. I have aired down the tires of my F350 crew cab 1 ton to 14-15 psi when launching a 4500 lb. boat on a dual axle trailer across the beach in Baja. These tires are Toyo M55s 285-75-R16 load range E.
If you are driving a very lightweight vehicle (like our Jeeps) I expect that you could go to 10 psi - maybe a little less. The more plies in the sidewall, the more lateral support you get, the lower you can air down. The best index might be the percentage increase of the tread width. Going from 6" tread width to 7.5" is probably realistic - try this in your driveway and and see how much you need to air down to get to that width.
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'47 CJ2A -- #114542
Warn FF D41 rear Lock-Right locker 11" drum brakes Dual master cylinder T90C Transmission 16 X 6 Jeep truck wheels Cooper STT Pro tires |
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jpet
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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: 13563 |
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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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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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Joe Friday
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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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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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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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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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smfulle
Member Sponsor Member Joined: 16 Sep. 2010 Location: Ogden, Utah Status: Offline Points: 6123 |
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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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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: 6123 |
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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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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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