question:

WHY Commercial T/A AS's? that makes no sense...a 10 ply highway tread tire on a Jeep? I could understand the Commercial TA Traction, but this is a tire choice that has me scratching my head. If you're going off road, that's really not a great choice for traction.

Also, tjkj is 100% right about your pressures. I'm running my 10 ply MTR's at THIRTY psi...80 psi max...and this is what they look like on level ground.
(sorry if the pic is big, I haven't resized them yet...)


All tires will have a slight bulge at the bottom at normal inflation. if they DON'T have the bulge, you've got too much air in them.

No use questioning his reason, he thinks he is correct . I just wanted some info as to where he came up with the reason for high pressures. I have over 8 years experince working in tire shops from starting at the bottom changing them to being a manager and have never heard this before, I am just really really curious on this

Tom

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited

Yep, a common trait for radial tires,now bias-ply tires is a whole nother story.

Save the sarcasm for a private message. I'm not questioning anyone else's experience, just explaining my own. And as I said, I got the 10% number from information in the news during the Ford lawsuits.

As for the bulge, yes, all tires have them, and so do these. The picture doesn't really show how pronounced the bulge was at 40psi. To me, it didn't look good to leave it like that. I still might lower the pressure a little to 60psi, to soften them up just a bit. Why a highway tire tho? B/c that's where this will live. I didn't buy the KJ for it's offroading capabilities, although that is a nice bonus. I bought it because I needed a small diesel engine that could tow and carry more than my VW Jetta TDI could, AND was not a pickup truck. South Florida is riddled with homeowner associations, and the one I'm stuck in is a doozy. They haven't decided exactly what a truck is in almost 30 years, even though the original documents don't give them enforcement rights anyway.

Is a "truck" a: Commercial vehicle, including panel vans? A pickup? A pickup with a tool box in the bed? Any vehicle with commercial signs or letters? Any vehicle with ladder racks?

All of the above have been justification for harassing people for years, just not all the definitions at the same time. They keep changing the list.

So why poke the bear? I decided I needed an SUV... And the Liberty rapidly became the only choice.

I want these tires to last their full lifespan (or more) and also give me the best mileage they can. To do that, I need to reduce the rolling resistance and friction heating as much as possible, and fully inflating them does that for me. Ride quality might suffer a little, so that's the compromise. - lower pressure = softer ride, but lower economy and potentially lower tire service life.

NO sarcasm that I can see, just points of view, I asked questions and never received a response so if that was directed at me it wasnt sarcasm I would just like to know more on how you arrived at running tires at the max air pressure is all. We are all on here to learn and share so therefore my questions

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited

And I have answered you no less than 3 times. The 10% number came from the Ford / Firestone lawsuits. That is all the information I have at this time, and it's in my memory. If that information is online, be my guest in finding it. I have not seen it again, but a company will tend to be the most vigorous in defending itself from a lawsuit, and not try to protect business contracts by omitting information that might impact those contracts.

You want to know my personal tire failure stories? There are a bunch.

83 Lincoln Town Car. Michelin tire peels off at highway speed, still had half it's tread left. 5 more Michelins on 3 other cars in my family ALL fail with bubbles within the next 3 months.

RV #1: Front wheel peel-off, 110psi tire was at 70psi. Thankfully, no failure of the air containment, just a tread separation.
RV #1: Cross country trip, 110 psi tires at twice their age limit, 2 catastrophic failures, I sacrificed the other two (all on rear axle) and replaced them. They failed due to excessive road heat (100+ degree ambient temps August 2006)

1997 Jeep Grand Cherokee - Peel off and complete sidewall demolition at highway speed. Tire had slow leak, and was probably at around 25psi out of a 44 max. Overheated and destroyed.

Need I continue? The ONLY tires that I have had fail at their sidewall max, were the ones on RV#1 that were 10 years old. I didn't know they were that old before I left on that trip, and those tires had already crossed the country 3 times in their life. They were due to fail, and did. None of the other cars I have had, where the tires are run at max pressure have EVER worn unevenly, or failed with a catastrophic peel off. Peel-offs happen when the glue binding the tread to the tire overheats and degrades, and the tread loses it's adhesion to the carcass. A tire may LOOK like it's a one-piece deal... Far from it.

Now, I've explained my reasons yet again. Please do not continue to ask the same question. If you have a specific question, ask that.

I'd question the source, then, because those lawsuits were BS to begin with. If it was Ford's fault, the Wrangler RT/S's that came on my dad's 96 Explorer would have had the same issue...and that 96 towed a couple hulking 60s GM landbarges from Ohio to Michigan and vice versa a few times ('66 Buick Special, '71 Olds Cutlass)

That being said, LRF tires are a whole 'nuther ballgame when they're under an RV. Of course you had a tread seperation.

the '83 Town Car's Michelin failure can also be explained if you tell me how old the tire was and how much dry rot was present. Michelins (from my short time on this earth) have ALWAYS seemed to dry rot REALLY bad around the shoulders of the tread, thus leading to a tread seperation. Can't tell you how many old people that rarely drive I've seen cuss out Michelin because a 9 year/30,000 mile old tire's tread peeled right off the carcass on their Town Car or Grand Marquis

Of course the 97 Grand Cherokee's tire would fail...25 psi in a 225/70-15? on a 4000+ pound SUV is not acceptable, especially on the crap Goodyears Mopar's had a habit of putting on Jeeps the last few years. IIRC ZJs, XJs, WJs, KJs, XKs, and WKs all cal for 33 psi. 25 psi is about 20% too low.

PS-not trying to argue, just enlighten.

I don't want to get in a pissing match but I have a hard time believing that statement.I'm not argueing with you just need some proof of this one.On the tires sidewall it has the max tire wieght at this psi,so if the tire is rated to carry 3000lbs at 80psi that means for safe driving you need to have 80psi if there is 3000lbs on that single tire.Now your CRD tips the scales at about 4300lbs and just saying it has perfect 50/50 balance then there is 1075lbs on each tire,there is no reason to have your tires at max psi if they are rated at more then 1100lbs at max psi.I have run my tires at max psi before(not on my KJ) and wore the center tread real fast,I just can't see how your running max psi and not wearing the centers out unless you are at(or in your case) way over the rated GVWR of the CRD at all times.My KJ has a GVWR of 5600lbs,right now my KJ is 5500lbs(alot of extra armor and tools) and with my fat 200lbs but in it it is over the OEM GVWR and I'm only running 42psi(out of a max of 65psi) in my tires and I'm getting great wear and even after a 150mile roadtrip(75mph or faster,80 degrees) they where barely warm,and they are real aggressive MT tires(Interco Trxus MT's).


So my different ? is do you have a pic of a tire on one of your vehicles with over 5000 miles on the tires and proof of max inflation?( I'm not being sarcastic either just find it impossible of what you are stating)

well we dont have one of these Emoticons for throwing the towel in! I am done, no supporting documentation ... ...................... next!

Tom

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited

Unfortunately one of the issues with memory is that while a fact may stick in your memory - it's the context in which that fact was used which can affect the meaning.

Actually Google finds 200,000+ plus hits on Firestone lawsuits - I scanned about a dozen - none of them mentioned 10% of max, none.
Lots of comments about Ford's recommendation of 26psi - while comparable vehicle/tire combos were 35psi, and that at 19psi - the tire would not support the Explorer design weight.

All tire manufacturers recommend using the Auto manufacturers recommended pressure.
The tires are manufactured for a wide varity of vehicles and maximum is for the maximum weight vehicle that it can be used on, not for everything.

The negatives of too high a pressure are tire wear, and a minimized contact area - the contact area will affect your maximum adhesion in acceleration, cornering and braking.

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2005 CRD
stuff
Skeptic quod gratis asseritur, gratis negatur

hey, if the tire fails at 19psi, what's that got to do with a 26psi pressure spec?

If it started low at 26psi and people weren't checking tire pressures, they only had a 7 psi window before they leaked down to 19 and failed - if they had started at 35 they had 16 psi of air pressure to lose before they failed.

so fewer failed if you recommend 35 and ignore it than if you recommend 26 and ignore it.

The moral of the story is 'don't ignore tire pressures'

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2005 CRD
stuff
Skeptic quod gratis asseritur, gratis negatur

Exactly. Not Ford's fault people can't check tire pressure.

Well - one of the reasons Ford recommended 26 was that if they ran at 35 the stiffer sidewall allowed sharper turns and made it easier to roll.....

I wasn't real impressed with that.

but the tire blowout seemed to be people ignoring tires.

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2005 CRD
stuff
Skeptic quod gratis asseritur, gratis negatur

no, lower tire pressure would make your vehicle easier to roll over.

Yes and no,but 26psi is highly unlikely to have any greater risk then 35psi as long as the beads stayed seated.I've driven quite the distance with less then 25psi(curvy roads to) and didn't feel that much worse then the normal psi I run(42psi).Anyway the Exploder issue was the tires blew out then the vehicle rolled,not the other way around.

Actually the tire didn't even really BLOW, it was tread seperation. the carcass stayed intact.

call any tire professional on the planet, including firestone and ford professionals and tell them you are running all your tires at 90% maximum allowable pressure with no load in your ride and ALLLLLL of them will almost have a heart attack. Not a single one will tell you to run 90% of max pressure...I'm calling BS on this one. Call around and you will see...go into a tire place with your tires at 90% max and let the service guys rotate them and check the pressure. I can bet right quick, one of the tech guys will come out to WARN you that your tires are severely over inflated. but what do I know....I'm not a tire tech. LOL I just know from my own experiences that I've over inflated not even close to 90%, and I've been warned that I'm going to ruin my tire's tread pattern for sure. At the very least if yu are lucky, they will wear the centers much faster, let alone catastrophic failure.

_________________
2003 Silver Sport - Debadged
245/75/R16 DuraTracs
Cragar Soft 8s
OME Coils & Front Shocks, Bilstein Rear Shocks - Muddified Lift
JBA 4.5 UCA
K&N CAI
MagnaFlow Exhaust
Rola Vortex Rack

http://www.fusion-multimedia.com

not to mention, probably on a soccer moms vehicle which had horrible inflation on the tires which hadn't been checked since they drove it off the lot, 8000 miles passed the required oil change and driving it like it was a ford contour around corners.

_________________
2003 Silver Sport - Debadged
245/75/R16 DuraTracs
Cragar Soft 8s
OME Coils & Front Shocks, Bilstein Rear Shocks - Muddified Lift
JBA 4.5 UCA
K&N CAI
MagnaFlow Exhaust
Rola Vortex Rack

http://www.fusion-multimedia.com

Better to be over-inflated by 10psi than under-inflated by 5psi.



Find a new tire guy fast.

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2005 sport crd-SOLD No regrets