JPR928

Hi all

So, I'm currently living in an area where regulations require that the wheel and tire size specified by the manufacturer are installed on your car... :-(

Exceptions can be made, but these involve lengthy administrative procedures and require written things from the manufacturer stating that the equipment meets OEM standards, that the manufacturer excepts liability, etc.

I noticed in the Porsche Handbook that for a 90GT the following wheel sizes are specified:

Set 1: F-7j/16, R-8j/16 or Set 2: F-7.5j/16, R-9j/16

Given that I will have to mount the F-225/50 and R-245/45 as specified in the handbook, which set of rims should I take?

(D90s are still available in both sets. I could also take the flat dishes, but they are probably more expensive and are only available in the set 7j and 8j. I know that if I would unhook the RDK system, it would open my choices up more...)

Thanks for any comments you might have! John

ps - thanks to AO for putting the owners manuals online!! https://rennlist.com/forums/928-foru...al-online.html

Mrmerlin

I would go with the widest rims you can get and for the rear tires try 255 it may be an option ,
You didnt state if you infact have a GT or S4
where are you located?

S4ordie

There was only one set of D90's for the 928;

Wheels = Front -7.5x16 / Rear - 9x16
Offset = Front - 65mm / Rear - 52.3mm
Tires = Front - 225/50 16 / Rear - 245/45 16

The smaller width wheels were for 944's.

This info provided courtesy of www.928registry.org

Wheel Specifications can be found here: http://www.928registry.org/928%20Reg...928-wheels.htm

If you find the great info on this website helpful you might consider a financial donation which you can do here: http://www.928registry.org/928%20Reg...28Registry.htm No affiliation, just a grateful user.

JPR928

Mr. Merlin, Yes, I do have a 928 GT since about 3 weeks. I will also introduce myself more properly as soon as I have pictures etc. I happen to be in Switzerland, and belive me, they will not let you pass car inspection with the wrong size tire! Therefore, 255s won't work!

S4Ordie, I see what you mean now. The handbook specifies both sizes though for 1990 models. Apparently, Porsche used Set 1 (7j/8j) for the S4 as flat discs and Set 2 (7.5j/9j) as D90s for the GT.

Thanks for helping me sort this out. We are clear...


And ps - I will make a donation shortly. Still busy sorting all things out being a new 928 owner.

Vilhuer

There was also 7x16 ET65 front and 8x16 ET52.3 winter wheel option M482 for '89-91 MY which had RDK sensors installed. This is same design wheel what was used as 7x16 ET65 winter setup in all '78-88 models.

Rick Carter

I seldom see winter wheels for sale.

S4ordie

Were these D90's?

Vilhuer

No, same winter wheel design as used in earlier models except that they had RDK sensors and 8" rears.

Ispeed

JPR needs a set of proper 928 D90 wheels.
Anybody have any leads on a good set with RDK sensors? I am helping him with this; they would have to ship to me to get tires mounted up so he would be able to mount them on the car in September.

Jim M.

One other option; the 89 GT came with 8" fronts and 9" rears, both with a 60mm offset. But very difficult to locate a set IMHO.