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911uk

A question about wheels and tyres

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13 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHA question about wheels and tyres

Leading reported evidence

Run off

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No successful repair reported for this finding.

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Suggestion

Out of interest, which wheel does the speedo run off?

A question about wheels and tyres
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Leading evidence: 'Run off' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Run off' (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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Run on a 8.5x18 rim

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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

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Suggestion

Usually run on a 8.5x18 rim but still ok on 8x18.

A question about wheels and tyres

Run slightly wider tyre

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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

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Suggestion

It just means you are running a slightly wider tyre which does fit but is not optimal.

A question about wheels and tyres
Frequently discussed actions (3)

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Run off

No successful repair reported for this finding.

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

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Suggestion

Out of interest, which wheel does the speedo run off?

A question about wheels and tyres

Run on a 8.5x18 rim

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

Usually run on a 8.5x18 rim but still ok on 8x18.

A question about wheels and tyres

Run slightly wider tyre

No successful repair reported for this finding.

0
Reported fixes
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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

It just means you are running a slightly wider tyre which does fit but is not optimal.

A question about wheels and tyres
Coverage and how to read this overview

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.

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

  • 911uk: 1 discussions

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Generation: 20261026T165820Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi, This may be a bit of a simple question but can anyone tell me if 18" alloys off a 996 Turbo will fit my standard 996 C4 Tip. I notice that the tyres on the rears are 295/30/18 whereas my rears are 285/30/18s. Both have 225/35/18s on the front. Also what is a fair price for wheels from a Turbo like these? Thanks in advance. Martin.

POST 2Original post

No, they won't fit, as the wide body Turbo and C4S have different wheel offsets.

POST 4Original post

Seconded as per Richard. Turbo has 11" ET45 Non Turbo/4S has 10" ET65 Basically theyd stick out far too much, its not for example a case of fitting spacers. You can get 'narrow body' fitment, and to go on Boxster too.

POST 5Original post

No they stick out a bit past the wheel arch which is illegal ..and look like a Corsa thats been to Halfords once too often.

POST 6Original post

For some reason I have 295/30/18 which is standard but my fronts are slightly different being 235/40/18....shouldnt this be 225/40/18? What tyres should i fit on the front when I'm up for change?

POST 7Original post

Yes on the front it should 225/40/18. It just means you are running a slightly wider tyre which does fit but is not optimal. Also 225/40/18 is a very common size so cost is cheaper, more choice and if you care about N rating then obviously you will be able to get this as 235/40/18 wont be made with N rating. Brand-wise try to keep all four the same, IMO.

POST 8Original post

Whichever... 235/40/18 is the 996 MKII GT3 size front tyre. Usually run on a 8.5x18 rim but still ok on 8x18. GT3 also has 295/30/18 on a 11x18 rim on the rear. All N Rated

POST 9Original post

Thanks for you help chaps. I'm not too fussed about the whole N rated thing at the moment...I might change my mind when I'm due for a change.

POST 10Original post

If they are 235/40/18 they will be slightly larger diameter, which may affect the PSM. Also, being a non-standard size for your car might be an insurance issue in the event of a claim.

POST 11Original post

Another pointer is the GT3 has different wheel arch iiners to prevent the 235s rubbing. Probably best to stick to the 225s. Out of interest, which wheel does the speedo run off?

POST 12Original post

The speedo gets its input signal from the ABS sensors - an average of all four.

POST 13Original post

Ah in that case it looks you have made my mind up for me....I will defo be fitting the 225's Cheers for the help Richard

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