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Hot!New PZero rears but now sketchy front end

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mclement
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mclement PCGB Member
2020/04/01 06:29:03 (permalink)

New PZero rears but now sketchy front end

Just before lockdown I replaced rears on 991 Gen 1 with 11k miles. The fronts had advisory on mot as cracking but tread fine. Previous owner had covered 7k miles in four years so as a 2014 car the tyres are ‘old’ - front end at any sort of speed now very light and twitchy. Is this because I have much better traction at rear now and should also just replace the fronts?

9 Replies

ralphmusic
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ralphmusic PCGB Member
Re: New PZero rears but now sketchy front end 2020/04/01 07:17:32 (permalink)
6 year old tyres that have cracks in a 180mph car, I'd change them.
 
Whether they are causing the front to be light and twitchy, very probably with the imbalance of old and new tyres front to back.
 
Best to replace all round

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Tuf911s
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Re: New PZero rears but now sketchy front end 2020/04/01 07:17:53 (permalink)
I had a very similar situation on my 991 Turbo. It was still on it’s original fronts @ 17,000 miles 2015 car but similar to yours cracking. I replaced with a full set of N rated Michelin Pilot Sport 4S. a much better tyre in my opinion.  
fireblade
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fireblade PCGB Member
Re: New PZero rears but now sketchy front end 2020/04/01 09:11:07 (permalink)
Change all tyres if possible and I have found the Michelin Pilot Sport 4S is much better than the Pirelli on my 911.1 Turbo S. My Pirellis wore out very quickly but I do tour long runs in Europe and track three times a year/
mclement
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mclement PCGB Member
Re: New PZero rears but now sketchy front end 2020/04/01 10:00:18 (permalink)
Thanks all for your replies - will certainly change the fronts as soon as I can then and will off course have to stick with Pirelli for now, but next time look at Michelins
Thanks again everyone
keneccles
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keneccles PCGB Member
Re: New PZero rears but now sketchy front end 2020/04/01 20:17:15 (permalink)
Had to put my 2013 991.1C4S in for the 111 point check as part of warranty renewal. Car has about 17000 miles. Service manager then called to say guess what - for warranty, Porsche insist that tyres must be less than 6 years old regardless of tread depth which was still pretty good. So new Pirellis all round! He also commented that better to change all in one go so that grip all round is relatively equal, allowing for tyre width difference. The joys of owning a 911!
mclement
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mclement PCGB Member
Re: New PZero rears but now sketchy front end 2020/04/02 11:00:22 (permalink)
Thanks keneccles - again really useful so many thanks - just need to book a mobile fitter now for the new fronts!!  Seems National Tyres and Kwik Fit have the best deals
 
p.j.sayer-btinternet.com
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Re: New PZero rears but now sketchy front end 2020/04/03 11:07:42 (permalink)
If you have a Porsche warranty make sure you fit N rated tyres, preferably to the original specification i.e. "N0", "N1", etc.
My 2013 C4S completed 16k on first set of rears, it now has 34k with the original front tyres, they have 4mm on still with no cracks but have hardened off a little and require care in the wet to avoid significant understeer... particularly on roundabouts!  It will be a full set when I replace the tyres when mother lets us out to play again .
Philip
Lancerlot
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Re: New PZero rears but now sketchy front end 2020/04/03 11:37:25 (permalink)
Don't skimp on tyres.  As far as performance is concerned, there is nothing you can spend your hard-earned on more effectively than a decent set of rubber.
 
IMHO, I can see no point in making a significant investment in a superb high-performance sports car, then restrict it and possibly endanger yourself and your passengers by using old, worn or unsuitable tyres - just to save a few quid.
 
And I agree - always stick to 'N' rated tyres where possible - as they are tested and approved by Porsche. It's not illegal to fit non 'N' rated tyres and your insurance company will probably not be concerned either. To the Authorities, provided they are round and have the right amount of tread, you should be OK. But, as an enthusiast, you will want the best, so don't be selling yourself and your car short.
 
Here endeth the lesson!  
 
Regards,
 
Clive

The older I get - the faster I was!
Past - 924T, '911 SC, 911 C, 911 C2, 964, 996, 996TT, 997TT, 997GT2, 430 Scuderia, 997TT, 997TTS, 991.2TTS. Current -Macan S.
mclement
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mclement PCGB Member
Re: New PZero rears but now sketchy front end 2020/04/03 11:46:12 (permalink)
Couldn't agree more Clive and as soon as I can get booked in, new N rated tyres going on the front.  Was always going to change in readiness for trip to WEC at Spa.........
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