9 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHAnyone running 235/40/18 on a 7.5 wheel?
Leading reported evidence
Use 225/40-18
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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Performed · outcome unconfirmed
For the 993 Turbo and the 02'+ 996 Porsche used a 225/40-18 on an 8.0" wide wheel.
Leading evidence: 'Use 225/40-18' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Recommend size rim' (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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Performed · outcome unconfirmed
On the GT2 and GT3 they used a 235/40-18 on a 8.5" wide wheel.
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Discussions that contain suggestions
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Suggestion
Like Dell stated, the contact patch will be much smaller than if it mounted on a recommended size rim.
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 · Original poster
like the title asks, is anyone here running 235/40/18 on a 7.5" wheel?
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 · Original poster
Thanks guys, just wondering as a friend was going to hook me up with a brand new set for next to nothing.
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.
9 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T094842Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
like the title asks, is anyone here running 235/40/18 on a 7.5" wheel?
I know that 225/40/18 is the 'approved' size up front, but I would like to know if anyone is running this and if they have had any issues.
TIA
It won't fit and if if you could get it to fit you will still have the same contact patch as the 225 so no benefit to trying to get that rubber on there. You need at least an 8" wheel but even better is a 8.5" wheel for that 235.
It will mount up on a 7.5" rim but the sidewall will 'balloon'. Like Dell stated, the contact patch will be much smaller than if it mounted on a recommended size rim.
For the 993 Turbo and the 02'+ 996 Porsche used a 225/40-18 on an 8.0" wide wheel. On the GT2 and GT3 they used a 235/40-18 on a 8.5" wide wheel. I run this size on a set of 9.0" race wheels. Will it fit? Yes. Is it advisable? No. The primary issue isn't they extra that the tire baloons from the rim, it is the effect of the extra width. The result is much slower turn-in and some instability. The only way to compensate is to increase tire pressure, which reduces contact patch and overall grip. The bottom line is there is no performance advantage to over-tire sizing a wheel.
Dell, I have the 18" turbo look wheels. I thought they were replicas because I didnt see any numbers next to the valve stems, and IIRC all Porsche wheels have offset and width there? but the 18s are in my option codes, so I assume they are oem?
Inside the wheel you should have a part number. Snagging a set of 8" turbo looks fronts off eBay, etc, ,would get you what you need to mount that tire.
The 18" OEM Turbo Looks do NOT have the width and offset stamped on the finished side of the wheel.
They are stamped on the backside of one of the spokes, along with the part #.
This is a source reference. Confirm exact model applicability in the original material.
