8 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHLarger Tyres
Leading reported evidence
Install 285/30 tires
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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Discussions that performed work without a confirmed outcome
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Performed · outcome unconfirmed
I, with no problem at all fitted 285/30 tires on the rear of my 2001 C2.
Leading evidence: 'Install 285/30 tires' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Install 285/30 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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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.
Discussions that performed work without a confirmed outcome
1
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0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
Currently I have 225/40 ZR 18 fitted on the front, on Sport Design wheels - 7.5 50 is marked on the wheel and on the rear I have 265/35 ZR 18 with 10 65 marked on the wheel.
<strong>Currently I have 225/40 ZR 18 fitted on the front, on Sport Design wheels - 7.5 50 is marked on the wheel and on the rear I have 265/35 ZR 18 with 10 65 marked on the 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.
Discussions that contain suggestions
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Suggestion
It seems most people who want to increase the tire size do what Porsche did for the Carrera 2 coupe with 18" wheels in 2002: Change the front wheel to an 8x18 but with the same 225/40 tire and put the 285/30 on the rear 10x18 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.
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.
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.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
Currently I have 225/40 ZR 18 fitted on the front, on Sport Design wheels - 7.5 50 is marked on the wheel and on the rear I have 265/35 ZR 18 with 10 65 marked on the wheel.
<strong>Currently I have 225/40 ZR 18 fitted on the front, on Sport Design wheels - 7.5 50 is marked on the wheel and on the rear I have 265/35 ZR 18 with 10 65 marked on the wheel.
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 seems most people who want to increase the tire size do what Porsche did for the Carrera 2 coupe with 18" wheels in 2002: Change the front wheel to an 8x18 but with the same 225/40 tire and put the 285/30 on the rear 10x18 rim.
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.
8 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: 20261027T011819Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Currently I have 225/40 ZR 18 fitted on the front, on Sport Design wheels - 7.5 50 is marked on the wheel and on the rear I have 265/35 ZR 18 with 10 65 marked on the wheel. I assume the 7.5 and 10 represent the width of the wheel. I would like to increase the size of the rear tyres, but I was informed by one dealer it is not possible, but he didn't seem confident. Looking at the C4S spec. it would appear they are working on a 11J which allows fitting of a 295/30 as standard. I would like to go for a 285/30 or 285/35 and if it is possible are there are foreseen problems ? Thanks again everyone in advance.
I, with no problem at all fitted 285/30 tires on the rear of my 2001 C2. There were more posts on this a while back. You may want to search the archives.
[quote]Originally posted by wakejudge:
<strong>Currently I have 225/40 ZR 18 fitted on the front, on Sport Design wheels - 7.5 50 is marked on the wheel and on the rear I have 265/35 ZR 18 with 10 65 marked on the wheel. I assume the 7.5 and 10 represent the width of the wheel. I would like to increase the size of the rear tyres, but I was informed by one dealer it is not possible, but he didn't seem confident. Looking at the C4S spec. it would appear they are working on a 11J which allows fitting of a 295/30 as standard. I would like to go for a 285/30 or 285/35 and if it is possible are there are foreseen problems ? Thanks again everyone in advance.</strong><hr></blockquote>
Why? You would get increased understeer, which may not be desirable.
Thanks Christer
" Why? You would get increased understeer, which may not be desirable."
Even if the rears were just upgraded ?? If so I will not consider it. Colin
Wake, I have the same size wheels in the Porsche Turbo Look (7.5x18 front, 10x18 rear). It seems most people who want to increase the tire size do what Porsche did for the Carrera 2 coupe with 18" wheels in 2002: Change the front wheel to an 8x18 but with the same 225/40 tire and put the 285/30 on the rear 10x18 rim. Apparently, making the front rim just a half inch wider with the same tire keeps the balance with the wider rear tires.
Kerry exactly! I've got a set of wheels and tires on the way from TireRack for my 2001 C2 Cab. SSR GT3 wheels: 18x8 and 18x10 with S-03 tires: 225/40 and 285/30. These will be replacing my stock 17" setup.
Thanks Kerry,
I have been to my OPD today, regarding other items and viewed a new 2002/3 model and yes they are working with 285/30 on the rear with 10x18 wheels, but with 8x18 wheels on the front but with the same 225/40 tyre on the front. The extra wheel width on the front clearly helps. I have another posting about my Sport Design wheels, they have some corrosion at the rear - at some stage it looks like I will be changing them. Dispite the 6,000 miles. I can review it then.
Thanks guys for your help.
Colin
Guys,
DO you know if that same combination 8X18 225 and 10X18 285's would fit on a 99 Cab?
Thinking about upgrading from the 17s I currently have.
Is there an "offset" problem and if so, what is offset?
THanks,
Walt
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