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megdog
Silverstone


Joined: 11 Mar 2012
Posts: 104



PostPosted: Sun Nov 06, 2016 4:26 pm    Post subject: Bulges in sidewalls on my Pirelli's Reply with quote

Two bulges have appeared in the front and back tyres of my 991. No obvious impact damage at all, tyre walls are otherwise pristine and rimes are unmarked.... So i'm wondering if it might be a manufacturing fault. Anyone had similar with Pirelli P zero's 20" wheel?
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FZP
Hockenheim


Joined: 18 Jan 2015
Posts: 636
Location: Cheshire


PostPosted: Sun Nov 06, 2016 5:00 pm    Post subject: Reply with quote

Cars with low profile tyres are prone to this, especially from pot holes. The family car has 255/35/19 and I drove over a strip across the road where the tarmac had lifted in bad weather. Both front tyres developed an egg on the inside wall.
Do you recall a pot hole incident recently?
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megdog
Silverstone


Joined: 11 Mar 2012
Posts: 104



PostPosted: Sun Nov 06, 2016 5:22 pm    Post subject: Reply with quote

No this is the strange thing, I can't recall hitting anything or running over anything remotely harsh. Although given its on the same side I suspect you're right I probably did hit something.

Question is, small bumps and no wheel wobble etc, is it worth changing them for safety?
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Demort
Magny-Cours


Joined: 21 Mar 2015
Posts: 2536
Location: Sussex


PostPosted: Sun Nov 06, 2016 5:44 pm    Post subject: Reply with quote

The buldges tend to be were the reinforced coords inside the tyre have broken and its just the rubber supporting it in that place .

Depending on the size but personnely i would have said this with any buldge , that its not safe and will fail an mot.
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megdog
Silverstone


Joined: 11 Mar 2012
Posts: 104



PostPosted: Sun Nov 06, 2016 6:11 pm    Post subject: Reply with quote

Thanks guys. The tyres on the other side have 5.5mm of tread, so I'm just going to replace the two that need doing at the moment I think.
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6appeal
Spa-Francorchamps


Joined: 02 Jan 2016
Posts: 356



PostPosted: Sun Nov 06, 2016 10:01 pm    Post subject: Reply with quote

Feel your pain there... indeed, change that rubber, not worth the risk of them going pop.
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MaxA
Montreal


Joined: 11 Oct 2015
Posts: 567
Location: Dubai


PostPosted: Mon Nov 07, 2016 7:39 am    Post subject: Reply with quote

I'd replace all 4 with some fresh new Michelins. I wasn't all that impressed with the PZeros on my car.
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cheshire911
Paul Ricard


Joined: 10 Jun 2012
Posts: 3192



PostPosted: Mon Nov 07, 2016 10:04 am    Post subject: Reply with quote

Seems to be more common with Pirelli tyres.
Not heard of this happening with same profile Michelin or Continental (barring severe pot hole damage that damages any tyre).
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FZP
Hockenheim


Joined: 18 Jan 2015
Posts: 636
Location: Cheshire


PostPosted: Mon Nov 07, 2016 11:15 am    Post subject: Reply with quote

It's amazing the difference tyres make to driving a car. The Audience which copped the double bubble was on Khumo tyres which was what the car came with. Hated driving it. Put MPSS on it and it ia now a joy to drive. Get on the Michelin train, you won't regret it.
I'm also booked in at Centre Gravity to get the 911 geo done which should transform the car I'm told. Can't wait.
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Windy101
Trainee


Joined: 05 Jun 2015
Posts: 65



PostPosted: Mon Nov 07, 2016 11:18 am    Post subject: Reply with quote

I had the same problem with Pirellis on a new car (non porsche) @ 4000 miles.
 
  
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Fokker
Silverstone


Joined: 10 May 2012
Posts: 147



PostPosted: Mon Nov 07, 2016 5:51 pm    Post subject: Reply with quote

That sounds frightening and I would be in the phone to Pirelli straight away.
They have amazing customer service and i would imagine you're highly likely to get some new tyres out of it...

They had issues recently with the P Zero cracking and all customers who complained got new tyres and said the support they received was second to none.
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Hmetwally
Newbie


Joined: 25 Nov 2013
Posts: 27



PostPosted: Thu Nov 10, 2016 6:58 pm    Post subject: Reply with quote

just posted a thread about traction of pirelli s p zero, I have had them on another car and the tread wear rate was unreasonable and uneven too.
I am considering to switch to Michelins if i get some comfort on the traction.

Re the bubbles, they should be inspected by Pirelli themselves because sometimes its just how the plys overlap
 
  
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