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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHWinter wheels
Reported or suspected cause
ebay finger strikes again
Reported cause
No successful repair reported for this finding.
1
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0
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0
Reported fixes
Read evidence and context
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Reported cause · Original poster
The only issue is Ebay finger strikes again, so Bought once is at the fore.....
Leading evidence: 'ebay finger strikes again' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'ebay finger strikes again' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check offsets are compatible, not just the widths' (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
I have a 52 plate 996 turbo where a previous owner has installed 997 19" wheels
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Suggestion
Most important is to check the offsets are compatible, not just the widths.
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Suggestion
That said by poking about in the obc maintenance menu I did find an option marked tyre change or something, but if you recalibrate for 660's you will then have to do it again when you change back.
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Suggestion
Long shot, but if you have TPMS there is an option in the menu to change from 18" to 19" wheels.
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Suggestion
That said by poking about in the obc maintenance menu I did find an option marked tyre change or something, but if you recalibrate for 660's you will then have to do it again when you change back.
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Porsche Club GB: 1 discussions
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Hi Everyone
I'm the proud owner of a 2003 996 turbo and I'm wanting your comments on the following.
Present wheels and tyres are
front - 235/40R18 - overall diameter 645mm
rears - 295/30R18 - overall diameter 634mm
I'm looking to fit winter tyres and rims from a 997 C4 with the following specs
front - 235/35r19 - overall diameter 647mm
rears - 295/30r19 - overall diameter 660mm
the fronts are virtually identical, but will the difference in diameter on the rears cause me a problem?
James
Welcome James!
I don't think the diameter difference will make too much difference. I have a similar difference on the rears on my Cayman winter wheels/tyres, and it isn't an issue. Most important is to check the offsets are compatible, not just the widths.
On the other hand, I personally wouldn't fit 19" wheels on a 996. They were never designed for them. Cosmetically the right style can enhance the look, but the ride quality will suffer.
Having "cured" the occurances of PASM activation simply by replacing the worn front tyres, moving up from 634 O.D to 660 O.D. would in my opinion upset the system in a similar way and the last thing you need in the winter is random application of the opposing brake. When it happens unnecessarily the effect is quite strong as the car is attempting to correct an instability that isn't there. That said by poking about in the obc maintenance menu I did find an option marked tyre change or something, but if you recalibrate for 660's you will then have to do it again when you change back. What think you Richard?
Hi James
I have a 52 plate 996 turbo where a previous owner has installed 997 19" wheels
The diameter of the wheel is OK but there is a potential issue with the width of the tyre (mine are 305/30 R19) touching the outer wheel arch when cornering or driving through hollows when the suspension is depressed as there ain't a lot of space left in the wheel arch
Suggest measure up 10 times and buy once!
Adrian
Nice one Ady
The only issue is Ebay finger strikes again, so Bought once is at the fore.....
The offset is 5mm greater so they should fit under the arches okay.
Only time will tell, I'm fitting them tomorrow.
I'll post some before and after photos.
James
There is 26mm difference on these two sizes. On mine I have 25mm difference between my summer and winter rear tyres, and the PSM doesn't seem at all fussed by it.
BTW - PSM is Porsche Stability Management, and PASM is Porsche Active Suspension Management. Two very different things, but I understood what you meant. I don't think there is an option for tyre changing in the OBC, but I believe there is one in the PCM settings.
Hi All
Well the wheels looked quite nice but not just right.
Also, I'm learning that there aren't any tolerances built into 996 turbos, the rear wheels catch on the wheel arch inserts
so if anyone is interested in buying some winter tyres & alloys originally from a 997 C4s they're here.
James
