BF Goodrich A/T KO tyre cracks

Submitted: Saturday, Jun 05, 2004 at 17:35
ThreadID: 13494 Views:3099 Replies:10 FollowUps:5
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3 of my BF Goodrich A/Ts have developed cracks all the way round the bead/rim seal area between the bead edge and the rim protector possibly causing the new vibrations I can feel.Any one had similar problems and any ideas on the causes.
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Reply By: The Banjo - Saturday, Jun 05, 2004 at 17:50

Saturday, Jun 05, 2004 at 17:50
Hell....better check mine....just put a set on.....what mileage do you have in them ?
Are we talking right up against the rim ? - not up by the tread shoulder ?
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Reply By: Davoe - Saturday, Jun 05, 2004 at 18:13

Saturday, Jun 05, 2004 at 18:13
american or japenese manafactured?
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Reply By: kiss'n'dirt - Saturday, Jun 05, 2004 at 18:22

Saturday, Jun 05, 2004 at 18:22
I bought a set a while ago. It currently has 110 000km on them. Bought through Tom from Bob Jane Springwood. Two has since died with sidewall cracks.
they cracked from having lowered tyre pressure and driving hard.

still, 110 000km. can't complain
AnswerID: 61860

Reply By: joc45 - Saturday, Jun 05, 2004 at 19:09

Saturday, Jun 05, 2004 at 19:09
Hi Stephen,
Four of my 5 KOs are fine after 95,000, but I have a BFG AT pre-KO tyre, same size, which I fitted after wrecking a KO sidewall, and it has developed cracks as you describe, while the other KOs have not. It was suggested that the tyre was run underinflated, but if that was the case, why did the others not crack, as they have been running under identical conditions.
Would be interested to see how you go with a claim. I'm contemplating fitting a new set of KOs next week.
Gerry
AnswerID: 61867

Reply By: Jimbo (WA) - Saturday, Jun 05, 2004 at 20:58

Saturday, Jun 05, 2004 at 20:58
What size tyre and what pressures are you guys running?
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Follow Up By: joc45 - Saturday, Jun 05, 2004 at 23:20

Saturday, Jun 05, 2004 at 23:20
Mine are 265/75 R16 on a GU, and I was running mfr's spec of 29psi front and 36psi rear unladen, about 4psi more when fully laden, but I found that the wear was indicating underinflation, so I upped the pressure a couple more lbs f&r . Would probably have gotten more than the current mileage if not for this wear. 2 tyres have still got about 6mm tread, the other two are about 4mm left after 95k. And the non-KO has about 50% left, but splits all around it. About the only country they haven't tackled is deep mud.
Gerry
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Follow Up By: Jimbo (WA) - Sunday, Jun 06, 2004 at 11:39

Sunday, Jun 06, 2004 at 11:39
Thanks Joc,

Mine are 30 x 9.5 x 15 and are running 40 psi front and rear for normal day to day stuff. That was my fitter's recommendation and after playing around with the 4 psi rule and trying different pressures, that's what I've stuck with.

My Hilux weighs in at 2,430 kg in normal trim so that would put it around your GU's weight (?) , so I think your pressures might be a tad low.

But the proof is in the pudding - and with 95,000 kms on them you must be doing something right!
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Reply By: Richard - Saturday, Jun 05, 2004 at 21:11

Saturday, Jun 05, 2004 at 21:11
110 000 and 95 000 kays... jesus i 3/4s chewed out a set in less than 20000 kays, whats the secret
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Follow Up By: Truckster (Vic) - Saturday, Jun 05, 2004 at 21:20

Saturday, Jun 05, 2004 at 21:20
Being Asleep, and dreaming it?
LMAO
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Follow Up By: Richard - Saturday, Jun 05, 2004 at 21:33

Saturday, Jun 05, 2004 at 21:33
he he yeah, it obviously cant be from doin it
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Reply By: Truckster (Vic) - Saturday, Jun 05, 2004 at 21:21

Saturday, Jun 05, 2004 at 21:21
There have been numerous posts on many forums of this, but as many others here have said, air pressures can play a big part....

The Pre KO and KM tires were better, nobody doubts that, but seemingly suprising that BFG would risk their good name so much.. Muddies included.
AnswerID: 61885

Reply By: John - Sunday, Jun 06, 2004 at 00:22

Sunday, Jun 06, 2004 at 00:22
I had 6 BFG KO 235 85 16's made in USA from 1999 on split rim Troopie
All chipped badly on dirt.
3 sidewall failures, others wore out on average 50- 70,000 ks.
Would not recomend them for any bush work or use with tubes had multiple punctures/tube failures from start.
Were hard to keep balanced as they wore down on a couple of trips around OZ
They seem to wear and run OK on Bitumen, but not on dirt.
Now having a good puncture free run on Chinese tyres (touch wood)

Regards
John
AnswerID: 61912

Follow Up By: joc45 - Monday, Jun 07, 2004 at 20:24

Monday, Jun 07, 2004 at 20:24
John, your experience is the opposite to mine in relation to split rims.
I fitted BFG 235 85 16 pre-KOs to my previous GQ split rims after ditching a set of Adventurers, which scalloped, and would not balance from the start. Dunlop blamed the split rims, but two were visibly eccentric.
Anyway, the BFGs balanced no probs on the same split rims, ran true, were quiet, and while they did chip a bit on dirt, it was no more than other brands I had run.
One died before I could stop in time, cause unknown, at 100k on bitumen. Maybe the legacy of tubed tyres. Can't remember the actual mileage for them, but it was pretty good, I recall - they went with the wagon when I sold it. Interestingly, I had no splits develop in these tyres' sidewalls.
It was this general satisfaction which made me fit a set to the new GU in 2000.
Gerry
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Reply By: Stephen K - Sunday, Jun 06, 2004 at 12:18

Sunday, Jun 06, 2004 at 12:18
Thanks for the feedback.The section that that has split is the part that actually sits against the rim and is between the tyre bead and the rim protector and runs all the way around and about half way through the thickness of the tyre bead.They are USA made and are 245/75/16.I have had them for about 2 years and probally done about 45000k.Ihave other tyres and rims that I use on the road and swap them around with the BFG's when trips come around.I used them last year on a trip to Central Aus,the Kimberleys and beyond last year and and had no problems at all,not even any punctures.The tyre pressures vary.40 on road not towing .45 on the back towing.About 30 on outback dirt roads.I will see the tyre dealer Monday and see what he has to say
AnswerID: 61930

Reply By: JamieMac - Sunday, Jun 06, 2004 at 19:57

Sunday, Jun 06, 2004 at 19:57
I have 5 BFG AT 235/85R16 on 6JJ one piece (non split) rims onmy 89 GQ 4.2D. They have about 50K over 4 years with highway and off road work. I have had no problems with them.

They run at 41/42 psi wich is a little harder riding but wear is abot half way so I expect about 80-100K before they need replacing. I have rotated them regularly to even wear as best I can. They have never given me any balance problems, in fact they were recomended to me as my GQ had a the Nissan shimmy with several sets of tyres when I first got it. I was in the process of putting in castor kits and replacing all the bushes etc but the BFG's have resulted in all that gear sitting in the shed for four years (don't swmbo let me know it).

I hav run the tyres at higher pressure on longer trips with a heavy load and put em down off road as required but not usuall less than 20-25 psi

AnswerID: 61970

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