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What tire pressure - 991 C2 with Goodyear 235/285

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Old 09-20-2014, 12:24 AM
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Caprzeland
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Default What tire pressure - 991 C2 with Goodyear 235/285

What tire pressure do you guys have on your C2 with the standard equipped Goodyear tires?
Should I just follow the recomended pressure of 34 front and 42 rear?
Old 09-20-2014, 08:06 AM
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todd92
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You might want to start by reading the Owners Manual, rather than asking a question that just got asked in another thread.
Old 09-20-2014, 10:03 AM
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certified_prime
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I run 28 front and 34 rear in comfort mode.
Old 09-20-2014, 11:30 AM
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Caprzeland
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Originally Posted by todd92
You might want to start by reading the Owners Manual, rather than asking a question that just got asked in another thread.
Which thread?
Old 09-20-2014, 11:33 AM
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Caprzeland
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Originally Posted by certified_prime
I run 28 front and 34 rear in comfort mode.
Thanks for sharing, I also wanted to go a bit lower vs. specs, but was unsure if it is safe or may lead to excessive tire wear...
Old 09-20-2014, 11:40 AM
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todd92
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Right on the 1st page of threads.

What Tire Pressure?

Of course, you could use the search function. Reading the Owners Manual helps too.

Don't start with, 'but that thread asked about 20" P Zeros and I'm asking about 19" Goodyears'. The answer is the same (though the pressures are slightly different), read the manual or search. I don't mean to be the forum police, but this kind of question is bad forum etiquette.
Old 09-20-2014, 11:58 AM
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Caprzeland
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Originally Posted by todd92
Right on the 1st page of threads.

What Tire Pressure?

Of course, you could use the search function. Reading the Owners Manual helps too.

Don't start with, 'but that thread asked about 20" P Zeros and I'm asking about 19" Goodyears'. The answer is the same (though the pressures are slightly different), read the manual or search. I don't mean to be the forum police, but this kind of question is bad forum etiquette.
I saw that thread re the P Zeros, but I thought different tires brands with different sizes behaved differently.
Old 09-24-2014, 01:16 AM
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Key Left
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Originally Posted by Caprzeland
What tire pressure do you guys have on your C2 with the standard equipped Goodyear tires?
Should I just follow the recomended pressure of 34 front and 42 rear?


I have quite a bit of experience on this question: we have 25K on our C2 and on our second set of Goodyears.

We got a tire cupping issue on our fronts running in the "comfort mode" pressure range. They were done at 13K. Our backs lasted until 15K. Note, we largely do long distance driving, so bear that in mind.

On our second set we switched to the 34/42 lbs. formula and are getting better wear. The Goodyear people told me higher pressure makes them last longer.
But remember worn out on a 991 means the inside tread only. When we dis -mounted our original set the balance of the tire was at least 7/32's.

Hope this helps.
Old 09-24-2014, 01:33 AM
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chuck911
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Originally Posted by Key Left
But remember worn out on a 991 means the inside tread only. When we dis -mounted our original set the balance of the tire was at least 7/32's.
.
Porsche sets the car up with camber that will give nice even tire wear when the car is given a good balance of straight line and hard cornering. There are so many guys commenting on their nice even tire wear that they must have done a pretty good job. Drive the turns harder and your tires will wear more evenly. Or, if that's just not on the cards, then go ahead and back off camber. The car is to a certain extent adjustable to better suit your driving style.
Old 09-24-2014, 06:09 PM
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Key Left
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Originally Posted by chuck911
Porsche sets the car up with camber that will give nice even tire wear when the car is given a good balance of straight line and hard cornering. There are so many guys commenting on their nice even tire wear that they must have done a pretty good job. Drive the turns harder and your tires will wear more evenly. Or, if that's just not on the cards, then go ahead and back off camber. The car is to a certain extent adjustable to better suit your driving style.
Where would one get a backed off camber set of alignment specs for a 991 C2, no PASM?
Old 09-24-2014, 09:07 PM
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accce
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34F
44R
Heavy load mode
Old 09-30-2014, 02:22 AM
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Originally Posted by accce
34F
44R
Heavy load mode
Where did you get 44lbs for the rear tires from?



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