7 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHWhen to replace both tyres? - Page 1 - Boxster/Cayman - PistonHeads UK
Leading reported evidence
Install with a limited slip differential
Performed · outcome unconfirmed
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0
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1
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Performed · outcome unconfirmed
My understanding is the only question is whether the car is fitted with a limited slip differential.
When to replace both tyres? - Page 1 - Boxster/Cayman - PistonHeads UK
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Leading evidence: 'Install with a limited slip differential' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Install with a limited slip differential' (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
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion
Depends who’s paying if it’s the OPC it won’t matter, if it’s the customer very little wear before they’ll want both tyres changing especially if it’s under warranty.....my OPC gave me grief over a professionally repaired tyre with 2000 miles on it and suggested I change both rear tyres.
When to replace both tyres? - Page 1 - Boxster/Cayman - PistonHeads UK
Replace both
Suggestion or failed attempt
No successful repair reported for this finding.
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Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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 · Original poster
What's the % difference between two tyres we can tolerate before replacing both?
When to replace both tyres? - Page 1 - Boxster/Cayman - PistonHeads UK
Replace especially if it’s
Suggestion or failed attempt
No successful repair reported for this finding.
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0
Unsuccessful attempts
1
Discussions
Read evidence and context
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.
Suggestion
Depends who’s paying if it’s the OPC it won’t matter, if it’s the customer very little wear before they’ll want both tyres changing especially if it’s under warranty.....my OPC gave me grief over a professionally repaired tyre with 2000 miles on it and suggested I change both rear tyres.
When to replace both tyres? - Page 1 - Boxster/Cayman - PistonHeads UK
Replace rear tyres
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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.
Suggestion
Depends who’s paying if it’s the OPC it won’t matter, if it’s the customer very little wear before they’ll want both tyres changing especially if it’s under warranty.....my OPC gave me grief over a professionally repaired tyre with 2000 miles on it and suggested I change both rear tyres.
When to replace both tyres? - Page 1 - Boxster/Cayman - PistonHeads UK
Repair tyre
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
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
Depends who’s paying if it’s the OPC it won’t matter, if it’s the customer very little wear before they’ll want both tyres changing especially if it’s under warranty.....my OPC gave me grief over a professionally repaired tyre with 2000 miles on it and suggested I change both rear tyres.
When to replace both tyres? - Page 1 - Boxster/Cayman - PistonHeads UK
Replace especially if it’s
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
Depends who’s paying if it’s the OPC it won’t matter, if it’s the customer very little wear before they’ll want both tyres changing especially if it’s under warranty.....my OPC gave me grief over a professionally repaired tyre with 2000 miles on it and suggested I change both rear tyres.
When to replace both tyres? - Page 1 - Boxster/Cayman - PistonHeads UK
Replace rear tyres
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
Depends who’s paying if it’s the OPC it won’t matter, if it’s the customer very little wear before they’ll want both tyres changing especially if it’s under warranty.....my OPC gave me grief over a professionally repaired tyre with 2000 miles on it and suggested I change both rear tyres.
When to replace both tyres? - Page 1 - Boxster/Cayman - PistonHeads UK
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.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
PistonHeads: 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: 20261027T053112Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
It’s for a boxster. My mate is picking one up and the dealer have replaced one tyres with a new one but he suspects that the other one is quite a bit more worn.
Depends who’s paying if it’s the OPC it won’t matter, if it’s the customer very little wear before they’ll want both tyres changing especially if it’s under warranty.....my OPC gave me grief over a professionally repaired tyre with 2000 miles on it and suggested I change both rear tyres.
Our 986 handbook it states that the difference in tread depth in such circumstances must not exceed 30% on one axle.
This stipulation does not appear in our 991 handbook.
Holgate86 said:
.....my OPC gave me grief over a professionally repaired tyre with 2000 miles on it and suggested I change both rear tyres.
That's refreshing, whereas they sold me a car on Cup2s where one had been plugged!
My understanding is the only question is whether the car is fitted with a limited slip differential. I would expect ABS and yaw control to cope without issues.
On a car with an "open" differential (non-LSD) I can't see that nuances of tyre diameter make any difference. Sure, the diff will be rotating a bit all the time but I don't see any reason for that to be a problem.
On a car with LSD the situation can be different because whenever the diff detects a material difference in wheel rotation speed it will be "working" a little and trying to limit that slip. Obviously the bigger the diameter difference the more work the diff will be doing. This can cause accelerated wear and/or overheating, depending on the type of LSD fitted.
On cars with 4WD - obviously not a Boxster/Cayman - then, depending on the 4WD system fitted, there may be two more differentials, one between the second pair of driven wheels and one between the front and rear axles. On some 4WD vehicles it's recommended that if you change one tyre you should change them all!
This is a source reference. Confirm exact model applicability in the original material.
