Burst tyre on my 06 cls500, 19" amg alloys and pirelli tyres, why?

kazino21

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My dad took the cls out today and after about 2 minutes from the house he heard the tyre burst. He had been driving at less than 30 mph, then when he was pulling away from the t junction at about 10 mph the tyre make a sound akin to driving over a pothole. He then contined to pull over and park the car, so this was about 20 metres of driving after the burst. The tyre that burst is the rear right tyre.

The car is used almost solely for pootling around town and has only been used a handful of times on the motorway. The front tyres were changed about a month ago and was told I had about 3-4000 miles left on the rears and that they were in good condition, so about a year or 2 of life left for them, so didn't bother changing them. I also had the allignment done at the same time on the hunter machine, it place is an independant specialists who are trustworthy (eurotyres in wembley).

The car is a cls500 with 19" amg alloys, 2006 06 plate car, 1 previous owner and was purchased about 6 months ago from an independant dealer (hillmoren in leicester) with 12,500 miles on the clock and it has now covered 2,000 miles. The dealer had carried out a minor service prior to sale of the car too.

I had taken the car for a little run on the motorway to give it's lungs a workout and found the car to be juddering above about 40-50 miles per hour and getting worse the higher the speed. It felt like the wheels were not balanced properly so I assumed that because I hadn't taken the car for a high speed run since it had had the new front tyres and allignment it was down to that or the tyres pressures (I didn't get round checking the tyre pressures however). I needed to take the car into mercedes for some small things on the car to be done anyways so thought I would let them check it out.

So am I right in guessing that the tyre actually burst?
Why would this happen, I cannot see anything apart from one old one that seems to have safely lodged itself in some time back?

Thanks in advance
 

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kazino21

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Would this count as a technical thread? Should I repost it in a different section?
 

carlsson20

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The tyre looks knackered and more a less down to the wear indicators, I've just had a rear tyre let go on my SL, split at the same side. it just looks like its had enough, good job you weren't tootling down the motorway at speed.
 

Mr Teddy Bear

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Either underinflation or a manufacturing fault at a guess. If the tyre wall was starting to bulge or deform a precursor to a blow out I would have thought the inspection would have discovered that?:confused:
 

television

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I think that the tyre has been run under inflated for some time in its life and cut the nylon cord or bottomed out on a large pot hole
 

jberks

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Goes to show that tread depth isn't the only thing that should be monitored. Sidewalls are often neglected but equally critical.
If the tyre pressures were low, on a very low profile tyre and a short stiff sidewall, something has to give. The rim will be pressing down, damaging the tyre carcass. Often it will be the sidewall itself that will flex but in the case of such a wide low profile tyre there isn't enough sidewall to take the strain.
I drove 50 miles on an 18psi 425/45/17 (not deliberately) but on checking when I got home as the handling wasn't 100% I found the sidewall was noticably warmer than the other 3, indicating I hadn't done it any favours.
 
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kazino21

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Called mercedes with my chassis number and confirmed that they were ordered with the car, so the wheels are genuine.

The picture was taken on my iphone and it is not very good so I can see why the tread appears very low. However I have measured the tread depth and it is 3.5mm (inside), between 3mm, 3mm, 3mm (outside), so camber must have been out for a while with the previous owner?
 
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kazino21

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Also the car was not driven over the pothole when the tyre burst, it is just the manner in which my father described the sensation of the tyre bursting
 

television

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Also the car was not driven over the pothole when the tyre burst, it is just the manner in which my father described the sensation of the tyre bursting

No no, before you bought the car, the last owner could have driven down a pot hole (they are very low profile) and cut a few cords, the rest have been slowly breaking away since, there is no question about the cords being cut, it could not burst in the way that it has if they were not cut
 

stumpy

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Does the CLS have tyre px monitors?

Just goes to show though that a tin of gunk aint gonna help anyone in this situation. I know spare wheels are big, heavy and bulky but at least it gets you home.
 

Xtractorfan

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Yea agree with malcolm that tyre may even have been run flat for a period . many ppl run these tyres underinflated and dont realise that they are doing damage,,
 

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Does the CLS have tyre px monitors?

Just goes to show though that a tin of gunk aint gonna help anyone in this situation. I know spare wheels are big, heavy and bulky but at least it gets you home.

Worth getting the first aid kit, and you can use a few sticky plasters to get you home:rolleyes:
 
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kazino21

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Thanks chaps, good lesson learnt so will check tyre pressures much more often and have ordered a couple of rear tyres to be put on tomorrow.

Called Pirelli who said they would take the tyre for inspection.

On another forum someone said
"IIRC, about a year or so ago Evo found out that some CLS rims were "soft" and prone to warping/manipulation (apparently the same thing can alsp happen on mrk1 RS4 avants?!) that could eventually lead to a blow out; can anyone else recall? I'm pretty sure it was in Evo's long-termers update section..."

I guess I'll just ask the tyre fitter to check for any warping of the wheel
 

jubhi

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The tyre pressure loss warning system should have flagged it up if you were running under inflated..... I'd get the tyre pressure loss sensors checked out by MB also.
 
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kazino21

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Good point, will have it checked. It did say the tyre was underinflated when it had popped though and asked to reinflate which obviously didn't work. Does it really have a pump to inflate the tyres?
 

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Good point, will have it checked. It did say the tyre was underinflated when it had popped though and asked to reinflate which obviously didn't work. Does it really have a pump to inflate the tyres?

Tyre pressure monitor only indicate when a change has taken place, they do nothing with a blow out, well they do, but both things happen at the same time.'

It is worth Pirelli to check the tyre as they can see if the cords have been cut or the tyre run under inflated

With the low side wall that you have, I do not see how you can drive on UK roads without damaging them without increasing the pressures over what is in the fuel filler lid.

Just let your car roll head on up to a kerb and I bet the tyre will be down to the rim. hitting a hole at 30 mph is 100 times worse
 
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kazino21

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Good point, will have it checked. It did say the tyre was underinflated when it had popped though and asked to reinflate which obviously didn't work. Does it really have a pump to inflate the tyres?
 

television

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Good point, will have it checked. It did say the tyre was underinflated when it had popped though and asked to reinflate which obviously didn't work. Does it really have a pump to inflate the tyres?

No it does not
 

jibcl500

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Couldnt be bothered to read most of the thread, mainly because Ive drunk enough to sink a skunk, but guessing here its a Pirelli, if so dont buy Pirelli cos they're rubbish.

jib

Hik!
 


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