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Tyres on turbo cups - Page 1 - Porsche General - PistonHeads UK

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YOUR RESEARCHTyres on turbo cups - Page 1 - Porsche General - PistonHeads UK

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Install with 17 inch x7

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

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Performed · outcome unconfirmed
for reference, the 964RS cars were fitted with 17 inch x7.5J front wheels and 205/50 ZR17 tyres ( tyre width about 8 in), and 17 inch X9J rear wheels and 255/40 ZR17 tyres ( tyre width about 10 in).
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Tyres on turbo cups - Page 1 - Porsche General - PistonHeads UK

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Leading evidence: 'Install with 17 inch x7' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Install with 17 inch x7' (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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Use 215/45 or a 225/45

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Suggestion · Original poster
When I look at a tyre chart it says that 205/50 is a 6.5J tyre, not a 7J, does this mean that turbo cups are a 6.5J front (I thought that they were 7J) or that I should be using a 215/45 or a 225/45 on the front...
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Tyres on turbo cups - Page 1 - Porsche General - PistonHeads UK

Frequently discussed actions (2)

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Install with 17 inch x7

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

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
for reference, the 964RS cars were fitted with 17 inch x7.5J front wheels and 205/50 ZR17 tyres ( tyre width about 8 in), and 17 inch X9J rear wheels and 255/40 ZR17 tyres ( tyre width about 10 in).
Original post Read captured discussion
Tyres on turbo cups - Page 1 - Porsche General - PistonHeads UK

Use 215/45 or a 225/45

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
When I look at a tyre chart it says that 205/50 is a 6.5J tyre, not a 7J, does this mean that turbo cups are a 6.5J front (I thought that they were 7J) or that I should be using a 215/45 or a 225/45 on the front...
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Tyres on turbo cups - Page 1 - Porsche General - PistonHeads UK

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

PistonHeads: 1 discussions

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POST 1Original post

The original factory Cup 1 optional wheels on a 964 were 7Jx17 with 205/50 front and 8Jx17 with 255/40 rear - seems a bit odd, but that's what the factory supplied. Most people now fit 9J rears, but with the same rubber. So you probably do have 7J fronts. I've heard of some people fitting 225/45, but you may get some rubbing - have a look on Rennlist, there's always loads of tyre threads there. cheers Ian

POST 2Original post

Oh I forgot, if they're genuine Porsche wheels, they'll have the rim width and offset embossed either side of the valve stem. Should be something like 7 and 55 for a cup front. cheers, Ian

POST 3Original post

your tyre sizes are fine. for reference, the 964RS cars were fitted with 17 inch x7.5J front wheels and 205/50 ZR17 tyres ( tyre width about 8 in), and 17 inch X9J rear wheels and 255/40 ZR17 tyres ( tyre width about 10 in).

POST 4 / ORIGINAL POSTEROriginal post

Quick question for you guys, I have a set of 17" turbo cups on my 964C2, and I would expect those o be 7J and 9J fornt and back respectively. When I bought the car it has 205/50 on the front and 255/40 on the back. When I look at a tyre chart it says that 205/50 is a 6.5J tyre, not a 7J, does this mean that turbo cups are a 6.5J front (I thought that they were 7J) or that I should be using a 215/45 or a 225/45 on the front... Answers from someone more rubbered up than me appreciated. Fox ---

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