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C4S Tire question

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4 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

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YOUR RESEARCHC4S Tire question

Leading reported evidence

Install tires)

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Unsuccessful attempts: 1
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Performed · outcome unconfirmed · Original poster
I purchased a 2004 C4S 4 months ago with 4 brand new Pirelli P zero Rosso from a Porsche Dearlership (they had installed the tires).
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C4S Tire question

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Leading evidence: 'Install tires)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Install tires)' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

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Replace front

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Suggestion · Original poster
and do I have to change the front with brand new ones too?
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C4S Tire question

Replace rear tires can i install the 295

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Suggestion · Original poster
And my second question is if I have to change the rear tires can I install the 295 on the 10" width wheels?
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C4S Tire question

Frequently discussed actions (3)

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Install tires)

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
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Discussions that performed work without a confirmed outcome: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Performed · outcome unconfirmed · Original poster
I purchased a 2004 C4S 4 months ago with 4 brand new Pirelli P zero Rosso from a Porsche Dearlership (they had installed the tires).
Original post Read captured discussion
C4S Tire question

Replace front

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
and do I have to change the front with brand new ones too?
Original post Read captured discussion
C4S Tire question

Replace rear tires can i install the 295

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
And my second question is if I have to change the rear tires can I install the 295 on the 10" width wheels?
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C4S Tire question

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Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

4 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Rennlist: 1 discussions

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Generation: 20261027T070717Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi all, I purchased a 2004 C4S 4 months ago with 4 brand new Pirelli P zero Rosso from a Porsche Dearlership (they had installed the tires). I have already logged in 5000 miles as it is my daily driver. Today I just realized that I don't have the correct tires on the rear... Car came with front 225/40/18 on 18*8 wheels and rear 285/30/18 on 18*10 wheels. If I am correct I should have 295/30/18 on the back (the good news is the wheels will fit my winter setup of 225/40/18 and 265/35/18) So my first question is: Am I harming the 4S differential with those tires in the rear knowing that there is a -1.41% diameter variance and that with 295's there would only be a -0.47%? I can already see that the rear tires have more wear than the front ones. And my second question is if I have to change the rear tires can I install the 295 on the 10" width wheels? If I look at tire rack for the same Pirelli P zero Rosso it says the width rim range is 10"-11" but measures rim width is 10.5".... and do I have to change the front with brand new ones too? Thank you for your help!

POST 2Original post

Your reg wheels are 18 x 10? My 2005 996 C4S(actually produced in July 2004) has stock 18 x 11 wheels. Are these after market wheels? Fronts are the same as yours 18 x 8. Book says for mine 225/40 front and 295/30 rear. I don't know about range of diameter mismatch for front diff problems, but someone will pop in with that knowledge. It is not unusual for rears to wear quicker than fronts. Having said that do you know if car was aligned by dealer after tires installed. If so, how did the readings look?

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 15156562

Hi, thanks for your answer, yes the back wheels should be 18*11 but mine came with 18*10 which I know should be 11", but they are stock Porsche wheels (might have pertain to a C2)... and yes alignment was done.

POST 4Original post

If the offset is correct for your rear wheels, then they are probably OE winter wheels. The Porsche OE winter rears for the C4S are 18x10.

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