Cooper tyre stuffed in under 5000kms

[Brid]

After puncturing a new Cooper STT with a steel bracket which looked like it was pressed out of 1.2mm sheet, I am left wondering if the Coopers are as good as their marketing suggests in regard to puncture resistence, or am I just unlucky.

The bracket went through the middle of a tread block and right through the whole carcase...so maybe 40mm of tyre. Under 5000km use, so virtually brand new. And it's a throw away...bugger!! Maybe the compound is a bit soft?

I'd had a good run from a set of Wranglers, and had 6mm tread left at 100,000kms, with no punctures, or even loss of pressure. Thought they were becoming a bit more of a puncture risk, so bought the new Coopers. If only I'd done anothe 5000kms, I'd be laughing!

Any similar experiences?

[Chilly]

Hi, I have had no issues with my Coopers STT's I was out at the weekend and several cars had STT's on. All very happy with them. One driver had Mickey's on but only cause he could not get STT's at the time. He also was well happy with the STT's.
Sorry to hear of the puncture and the tyre being U/S. Something we all dread!

[strangy]

Coopers are the exact opposite of the marketing hype. I think they may burn well though.
But that just my opinion and a puncture can get any brand.

[lambrover]

Tyre pressure has a lot to do with getting or not getting a puncture. I would suggest that all tyres would have faired the same.

[PAT303]

Having had coopers I disagree,I had one set of coopers and had more punctures,vibrations,uneven wear in that one set than all the other types of tyres I've ever had combined. Pat

[CraigE]

Yep I wont buy Coopers again. Had STT's on the Fender. Less than 1000kms bolt straight through the huge tread block and irreparable tyre. Coopers and Tyrepower did not want too know. Had much better run out of Hankooks and Hercules tyres. BFGs are better also, but have not had a full life out of them as sold the car beforehand.
CraigE

[Drover]

I had Cooper's AT's on the work Ranger...shockers.

Got a few punctures but their wet weather performance was terrible.

Would never buy them for my vehicle.

[Defendozer]

My Dad has had Cooper STT's on his 110 for over three years and has never, ever gotten a puncture. They have been rotated every 10,000K's and are all very evenly worn, and having now done 85,000K's they are still not half worn yet. IMHO they perform very well in all weather conditions on most surfaces, on road performance is great as is off road driving. I would certainly put them on my Defender:)

[butundede]

I have had a good run out of Coopers, just put a new set of ST maxx, 10000 km old and no noticeable wear, nice and quiet, handle the wet excellently. But, each to their own, sometimes punctures are unavoidable, wouldn't matter which tyre you had.

[flagg]

I ran STTs until one delaminated going down the hume highway. Had the rest checked out and they all had (very deep) cracks in the tread, which I was told allows water to get in and the rest is history. Pressure were all fine (I check very regularly, but don't have a TPMS).

Plenty of people say that the coopers they had / have are great - and I'm very happy for them. But unfortunately my experience - and the experience of many others - has been that they are at best disappointing and at worst a serious safety hazard.

If you search the forum, you will find thread after thread of coopers failing. Everyone gets punctures somtimes but you just don't see that with other tires.

[Brid]

Interesting comments...thanks for that.

I had a closer look at my 5000km STT's yesterday. The tread depth is now 13mm (started at 15mm), so it looks like the wear rate is quite high. In fact, if I take them down to 6mm depth where I would normally change them out, I'd only get a total of 22,500kms!!! (Assuming the wear rate remained constant...it could slow up a bit.)

I also noted several small cracks developing on the tyre case between tread blocks. And now reading Flagg's comments, I suspect they could be candidates for a similar delamination failure, as he experienced.

Perhaps I should get a Cooper rep to look at them under warranty, but maybe I should also get some independent source to state, what Flagg mentioned...

...(very deep) cracks in the tread, which I was told allows water to get in and the rest is history...

I started out wondering if the failure was bad luck, but now it appears the STT's could quickly develop into a safety risk, as well as much, much shorter life than promoted.

Thanks again for those comments.

[boofdtl]

Could you post a pic and were abouts are you? ( ie state )

[Defendozer]

I had a closer look at my 5000km STT's yesterday. The tread depth is now 13mm (started at 15mm), so it looks like the wear rate is quite high. In fact, if I take them down to 6mm depth where I would normally change them out, I'd only get a total of 22,500kms!!! (Assuming the wear rate remained constant...it could slow up a bit.)I have found that the first couple of mm's always wear down quickly, I'm guessing till they get used to the car? And this is not just Coopers I have seen do this.. Has anyone else ever noticed this happening??

[MLD]

I have found that the first couple of mm's always wear down quickly, I'm guessing till they get used to the car? And this is not just Coopers I have seen do this.. Has anyone else ever noticed this happening??

I have BFG km2's. The first 5,000 kms they reduced in tread height dramatically. When I complained to someone (a 4wd'er not the tyre store) i was told that the tread blocks compress and harden as they vulcanise more from weight and heat. You should expect the tread blocks to stabilise and wear more consistently thereafter.

The same happens with bike tyres on your pushy. Old timers say you should put a new set of tyres under your bed for 6 months mumbling something about sleeping with them to know them better. The science suggests that the rubber continues to harden over time making them more puncture resistant.

MLD

[Defendozer]

So the trick then is to buy a set of tyres a few months ahead of time and leave them in the backyard in the sunshine:D

[flagg]

So the trick then is to buy a set of tyres a few months ahead of time and leave them in the backyard in the sunshine:D

a common truckies trick ;)

[scarry]

So the trick then is to buy a set of tyres a few months ahead of time and leave them in the backyard in the sunshine:D

Something you wouldn't want to do with BFG A/t's as they seem to go hard with age,then they have less grip on the bitumen,and also get cracks between the tread blocks.

After many sets of these,this is the only complaint,but usually happens when they are 6 to 7 yrs old,so the K's are pretty high by then anyway.

Overall i have found them excellent,with no punctures at all.:)

[Brid]

The offending projectile made a neat cut through the tread block and right through the carcase. The cut was about 25mm wide, but a photo wouldn't have shown much. It's probably been disposed of by the tyre shop now. I'm in Brisbane, by the way Booftdi.

[patclan]

Last month the in-law's hilux shredded a cooper just out of Alice Springs on the Old Andado Road, just before Allambi, still had 1 bar on the mobile so we could phone Mount Dare to check for a spare and not have to go back to Alice, thankfully they had one.

Only puncture on the trip, but it could have happened to either of us I suppose, my KM2's were great.. I did have 2 spare just in case, considering the price of tyres my next purchase will be a tyre monitor.




https://www.aulro.com/afvb/images/imported/2012/10/1543.jpg

[Basil135]

So the trick then is to buy a set of tyres a few months ahead of time and leave them in the backyard in the sunshine:D

I always thought this was a bit of a myth, until.....

SWMBO needed new tyres for her car. Did the usual ring around, getting prices, and mumbles about them being hard to get. (This is for a 2010 XR6 - wtf)

Anyway, ended up ringing an independant tyre mob, and spoke to the guy that owns the place. He had a full set that he had "put away for his own car"

When I went to get them fitted, I asked him about it. He confirmed that he would always put a set away, and let them cure for 6 to 12 months before fitting them.

He said to keep them out of the sun, just put them in a shed or somewhere similar, and leave them alone. Dont store stuff on top of them or anything, that may deform their shape.

Considering that tyre life is about 7 years, before they should be replaced regardless of tread, even putting them away for a year or so, should be ok.

[lambrover]

I still think the OP would have had the problem regardless of tyre choice. It appears he has run over a piece of steel that has left a 25mm gash in the tyre how can you blame a specific tyre brand for that, it's bad luck. Tyre pressure is the only factor that could have made a difference in my opinion.

Sent from my iPhone using Forum Runner

[strangy]

The Coopers moulding process uses induction heating for the moulds, this method causes the steel belts to become magnetised when the tyre is made.
Unless the tyre is demagnetised after manufacturing it is prone to attract metallic objects and makes the tyre more susceptible to punctures from Nails. Tech screws etc than other brands.
:angel:

[DEFENDERZOOK]

Just a quick note on your tyre wear.......you say 2 mm in 5000 Klms.......
If that was the case they would be bald in 20000kms.......


The tread is actually compressing a little......they will look like they are wearing.....and when it compresses all its going to.....it will slow right down.....
Keep tabs on how long it takes for the next 2mm to wear.....

[clubagreenie]

I had a copy (on a dead HDD) of the Coopers Dealer Warranty" manual. I say manual as it was many pages long and described in infinite detail basically how to avoid having to deny a warranty without having to ship it back to Coopers warehouse for assessment.

On reports of those that have had issues I'd be avoiding them, let alone the warranty procedure.

[dick180641]

Yes!! a very good trick, to let the new rubber "cure" and harden a little...BUT... not in the sun, in the shade! (U.V. a tyres worst enemy!)

[Hamjam]

I have also had a good run out of Coopers St, completed 121,000 out of them, and could have got more but decided to replace them as they starting to loos grip. I have just replaced them with the new St Max and hope to get the same Klm out of them.

Regards

James

[Chenz]

The Coopers moulding process uses induction heating for the moulds, this method causes the steel belts to become magnetised when the tyre is made.
Unless the tyre is demagnetised after manufacturing it is prone to attract metallic objects and makes the tyre more susceptible to punctures from Nails. Tech screws etc than other brands.
:angel:

I have had two sets of Coopers and have done some pretty tough tracks including recently driving the 250 to 300 mile centre line of fire in SA across trackless mulga scrub and just as many punctures as the rest of the team. Luckily there were no nails out there or I could have been in real trouble:angel: