re:post ID13494 BFG A/T KO splits

Submitted: Friday, Jun 18, 2004 at 15:58
ThreadID: 13893 Views:1788 Replies:8 FollowUps:7
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Just talked to the BFG rep about the spits in my BFG A/T's.The ones that run right around the tyres between the bead lip and the rim protector.Under inflation and flexing was the culpret he says.I must be the only one who runs the pressures low (35-45 psi)depending on loads and road and track conditions,there has'nt been too many tires with this problem.I would have thought under inflation would be much lower than these pressures,like 25 psi on road or lower for beach work. Tyres were meant to flex otherwise they would be made of solid rubber.Looks like I am up for 4 new tyres,but not BFG A/T's.Pity, they were performing very well.
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Reply By: biscuits - Friday, Jun 18, 2004 at 16:45

Friday, Jun 18, 2004 at 16:45

My patrol tyre placard says to put 30psi in the front of my 10R15 (31x10.5x15) tyres (which I suppose in that case you would consider 'low') - makes you wonder whose pressure recommendations you should follow then - the car or tyre manufacturers... but then the tyre manufacturers dont really put out anything but maximum pressure warnings - and the guys at the tyre shop always pump my fronts right up (55psi) because I dont have power steering...

If only there were auto road-sensing, load, inflating, deflating tyres!

AnswerID: 63782

Follow Up By: Mrs Diamond - Saturday, Jun 19, 2004 at 15:46

Saturday, Jun 19, 2004 at 15:46
31x10.5x15 should be run at about 32 psi unless you have a good load
55 is way to high
FollowupID: 325049

Reply By: Member - Jeff M (WA) - Friday, Jun 18, 2004 at 17:17

Friday, Jun 18, 2004 at 17:17
I wouldn't take that. Everytime I get a wheel alignment, service or any other bugger touchs my car, they insist on lowering my trye pressures to 32psi!! It's what the pacard says, but it's still annoying. If the placard says it's ok then it's ok!
(even if we all know it's not) am I confusing anyone yet??
But what a load of garbage. I know a well experienced tourer, 4wder who quite frequently runs his BFG AT's at 10psi on beachs and dunes with a loaded up 79sereis cruiser, if he aint having problems, either should you!
I run my Bridgstones (which are very long in the tooth I might add) at 12psi all the time, and no problems like you have described...
I'm keep changing my mind regarding what tryes to go to next after storey after storey about coopesr BFG's?? Looks like I might be getting another set of Bridgstone DD's. LOL
AnswerID: 63787

Follow Up By: Member - Nobby - Friday, Jun 18, 2004 at 17:25

Friday, Jun 18, 2004 at 17:25
I have to agree. I put my Jack. in for a service and it came back wandering all over the road. Pressure was at 32 all round. Put them back up to 36 and runs fine. Guy at the Servo(4wd place I might add) said that's what they should be for a soft ride.
FollowupID: 324927

Follow Up By: Member - Jeff M (WA) - Friday, Jun 18, 2004 at 17:31

Friday, Jun 18, 2004 at 17:31
It really makes you wonder doesn't it, I mean really I am a bit of a mechanics as.shole but I still find myself telling these guys what to do, what to look out for and what parts to use... If only I new what end to hold the hammer I'd be right!
FollowupID: 324929

Follow Up By: Member - Bradley- Sunday, Jun 20, 2004 at 14:16

Sunday, Jun 20, 2004 at 14:16
Hey guys , at holden they told me to only put 30 psi in the 17 inch tyres on statesmans, so the ride would be soft !! I politely told them they were jackasses, and that 45 or 40 series rubber should be at 45 psi minimum...

Makes you wonder sometimes ( makes me wonder why i left - NOT )

Hey Jeff, you probably know a lot more than the first year apprentice working on your car, so you might as well have a go..
FollowupID: 325193

Reply By: Member - Captain (WA) - Friday, Jun 18, 2004 at 17:49

Friday, Jun 18, 2004 at 17:49
Hi Stephen,

I too had problems with my BFG A/T KO's, hence my decision to try the Cooper ST's when i got my Patrol. Anyway, where are your tyres made? I have found the non-USA made BFG's are normally the culprit.

I had BFG's on my 80 series for many years (USA made) and was happy until I changed to the KO's. The issue I had was the steel belts protruding from the tread on the carcass. By that I mean it looked like the tyre had been spiked from the inside and a few steel wires were sticking out between the tread blocks near the edge.

These tyres rarely saw anything below 30 PSI and only once at 20 PSI for a very short distance. Was told by the tyre rep I was running on low pressures for too long and that the stiff sidewall had caused the steel belts to fail and pierce the tread !!! Tread was about 60-70% remaining (~20,000km old) and was very disappointed with the KO's.

But for every bad story about the BFG's, there are plenty of good stories. Same as for Coopers. I have now tired them both (only 17,000km on Coopers though) and so far prefer the Coopers IMHO. But every man and his dog has a different opinion on tyres and so much depends on where you go and what you do.


AnswerID: 63794

Follow Up By: Member - sparra - Friday, Jun 18, 2004 at 19:49

Friday, Jun 18, 2004 at 19:49
i'm replacing my u.s.a. made b.f.goodrich's next week after 70,000 trouble free kays,the bloke at geraldton tyrepower has always got some in stock. cheers sparra
no good being the richest man in the cemetry

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Reply By: Member - Ken - Friday, Jun 18, 2004 at 21:39

Friday, Jun 18, 2004 at 21:39
Evening Stephen.

I had a set of BFG A/T's that after 30000kms' developed numerous side wall splits on the inside walls.

They ran from the bead to the tread at right angles to the bead.

They occurred in not one tyre but all four which ultimately caused a major blowout of a rear inside wall.

I had no punctures prior to this and they were flogged over some of the roughest roads to be found in SA and NSW.

They were on my Troopy (3.5Tonne) and I always ran them at 45psi rear and 36psi front, except for a trip along the QAA and K1 lines of the Simpson desert prior to the said blowout. I lowered them to 18psi on the QAA line only.

I was at that time running the original split rims and tubes and I am now of the opinion that the low presure and split rims were the root cause of the degradation of the sidewalls. I can't remember if they were KO's or not.

Anyway I am now running COOPER ST's and have just done the Simpson West to East where the presure only went below 30psi once (Little Red) and I maintain around the 40psi mark on the bitumen. There has ben no sidewall splits or splitting anywhere. on these tyres to date.

So it remains to be seen how they go in the future. So far so good.


Ken Robinson

AnswerID: 63817

Follow Up By: Bob Y. - Qld - Saturday, Jun 19, 2004 at 14:41

Saturday, Jun 19, 2004 at 14:41
".......where the pressure only went below 30psi once (Little Red) and ..."


You're not one the blokes who recent posts have said, "are stuffing -up" the dunes by not lowering their tyre pressures? Thought there was enough sandhills to warrant doing this more than once.

Seen it all, Done it all.
Can't remember most of it.

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FollowupID: 325036

Reply By: Stephen K - Saturday, Jun 19, 2004 at 13:52

Saturday, Jun 19, 2004 at 13:52
I mentioned to the tyre rep about the Jackaroo tyre pressure plackard and he said these pressures are too low and are meant for comfort.How do do you know the correct pressures.You can have a guess,maybe look at the tyre bag or the wear pattern and when the tyre wears uneven you know the pressures not right.For dirt track travel the opinion is to lower the pressures to enable the tyres to travel over small boulders without any damage and to cushion some of the corregations but over time these lower pressures,according to the tyre rep will cause the case problems I have.Whats the answer.Use any tires bar BFG.I hav'nt had these problems with other tyres like this in 30 years of off roading.
AnswerID: 63922

Reply By: Bob Y. - Qld - Saturday, Jun 19, 2004 at 14:32

Saturday, Jun 19, 2004 at 14:32

Have been running BFG AT's since buying our 80 series, 2nd hand, nearly 6 years ago. Now using KO's which don't seem too diferent to me, except for the rim protector.

Have been running at 32 front & rear all that time, with no dramas. Might kick the rear up to 36 when loaded. Normally we are running 166L rear tank, plus Black Widow _Affordable_Storage_Drawers.aspx, so it's no light weight.

Reside in west Qld, so don't have luxury of a lot of bitumen. Have NEVER had a blowout, and only a couple of punctures. Only problem is they don't like rock, and tread gets chewed up a bit on road to town. No sidewall cracks either.

Just checked the tyres, they are made in USA.

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Can't remember most of it.

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AnswerID: 63930

Reply By: Member - Ken - Saturday, Jun 19, 2004 at 16:33

Saturday, Jun 19, 2004 at 16:33
This is directed to good old Bob Y in Qld.

Firstly Bob I have say no! I am not one one of those stuffing up the sand dunes for guys like you, by not lowering my pressures beneath 30psi when there is no reason to.

The common line of thought from all tyre reps and people who actually get out and 4WD all different types of roads in different conditions, is that you set your pressures to suit the conditions of the day.

Now thats what I do Bob and have done all my life on a variance of bush roads from where I grew up in the goldfields of WA to the super highways and desert tracks of today.

My first trip over the QAA line saw me lower the pressures to 18psi on the advice of locals, this forum and others. The vehicles we travelled with thought it was excessive in the least and were running 25 -30psi themselves. Everybody cruised the dunes no dramas. The only problem was me with sidewall splits.

So guess what Bob, this time it was 25psi front and 30psi rear until little red at an average of 10-15kph across the French line, no dramas with the tyres or dune chopping and no side wall splitting either.

Oh! must reiterate - I was on COOPER ST's this time.

It seems to me Stephen, that if you question BFG'S on this forum, the BFG-ites who forgot to take their pills in the morning come from nowhere.

Yes Bob I had a set of BFG'S the first time on the QAA

Yes! they were excellent until the sidewall splitting issue.

Yes! it scared the sh$t out of me when one had a blowout at a 100kph on bitumen near Renmark.

No! I don't want it to happen again

So for the time being the COOPERS are getting a go.

Who knows, next time it could be Hankooks, Goodyears etc etc.

One thing I do know is that tyres with LT on them mean they are light truck tyres which are designed to carry heavy loads at higher than usual pressures.

Try and operate them like passenger car tyres and you are in for an interesting time.

Have a nice weekend

Ken Robinson
AnswerID: 63950

Follow Up By: Member - Jeff M (WA) - Monday, Jun 21, 2004 at 10:58

Monday, Jun 21, 2004 at 10:58
Ken, each person has their own different opionions on tyre pressures, and each of us tried and proven methods which we are comfertable with, however I personally am surprised that you had no dramas in sand with pressures that high, especially with such a heavy vehicle (compared to the 4bies I've owned). I'm not having a dig at you, just genuinly suprised.
I always drop my tyres at the very very least to 18 psi when doing any sand work. Lower if I'm heading to beach/dune country. I find 30psi + on sand is very hard work for car, passengers and driver (comparativly).
You can get over most stuff, it's just hard work, uses a lot of fuel and will cause more damage to the tracks (IMHO).
FollowupID: 325315

Reply By: Utemad - Saturday, Jun 19, 2004 at 23:37

Saturday, Jun 19, 2004 at 23:37
I have BFG KO 225/75 16 on my standard Rodeo rims. Only ever had one flat at Double Island in Qld which was caused by having 20psi and making a sharp RH turn. No actual puncture just broke the bead.

50 000kms and no trouble.

AnswerID: 64026

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