PistonHeads

Switching 265/40 R18 to 255/40 R18 - Page 1 - Boxster/Cayman - PistonHeads UK

Add to repair workspace

New repair projectOpen repair workspace

Original source

4 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHSwitching 265/40 R18 to 255/40 R18 - Page 1 - Boxster/Cayman - PistonHeads UK

Leading reported evidence

Use 265/35/19 summer tyres and 255/40/18 winters without any issues

Performed · outcome unconfirmed

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 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
I use 265/35/19 summer tyres and 255/40/18 winters without any issues.
Original post Read captured discussion
Switching 265/40 R18 to 255/40 R18 - Page 1 - Boxster/Cayman - PistonHeads UK

Performed · outcome unconfirmed
I use 265/35/19 summer tyres and 255/40/18 winters without any issues.
Original post Read captured discussion
Switching 265/40 R18 to 255/40 R18 - Page 1 - Boxster/Cayman - PistonHeads UK

Read full discussion summary

Leading evidence: 'Use 265/35/19 summer tyres and 255/40/18 winters without any issues' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use 265/35/19 summer tyres and 255/40/18 winters without any issues' (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.

Read captured replies

1 matching discussions · 4 captured posts examined · 1 partial discussions

Frequently discussed actions (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Use 265/35/19 summer tyres and 255/40/18 winters without any issues

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 · Original poster
I use 265/35/19 summer tyres and 255/40/18 winters without any issues.
Original post Read captured discussion
Switching 265/40 R18 to 255/40 R18 - Page 1 - Boxster/Cayman - PistonHeads UK

Performed · outcome unconfirmed
I use 265/35/19 summer tyres and 255/40/18 winters without any issues.
Original post Read captured discussion
Switching 265/40 R18 to 255/40 R18 - 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.

4 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: 20261026T174436Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I have to plead ignorance and ask for help here. My current tyres are 265/40 R18 on the rear, but I'd like to change to 255/40 R18 to put winter tyres on (far more choice of tyre available). If I buy another set of 18in alloys for the rear with the 255 tyres on, what changes if any need to be made when swapping these in for the 265/40 R18s? They are a fractionally narrower width, so do I need spacers? Does this depend on the length of the wheel bolt used? Thanks in advance!

POST 2Original post

No you don't need spacers. I use 265/35/19 summer tyres and 255/40/18 winters without any issues.

POST 3 / ORIGINAL POSTEROriginal post

Trev450 said: No you don't need spacers. I use 265/35/19 summer tyres and 255/40/18 winters without any issues. OK, thanks. So the wheel bolts don't need to be fractionally shorter?

POST 4Original post

No because the wheels are the same size. Its only the tyres that are fractionally smaller.

This is a source reference. Confirm exact model applicability in the original material.