evilfij

I know the offsets are different in back, but there is the factory turbo S with GT3 wheels and I went humm. Some GTS 991.1 wheels are available locally cheap.

ipse dixit

I'm pretty sure they will fit, but I certainly wouldn't want to drive on them in a GT3.

evilfij

Why not?

ipse dixit

https://www.motorsport.com/automotiv...s-good-or-bad/

evilfij

No no no. No spacers or adaptors, I mean just will they fit without spacers. I think the only difference is the offset and they are close.

ipse dixit

Yes, I know you're not using spacers.

But mounting wheels with non-OEM offsets is essentially the same as running spacers with an OEM wheel (i.e., a wheel with the correct factory offsets).

Mech33

They should fit. Rear wheels are narrower on the GTS and Turbo.

The black 991.1 GTS wheels are one of the nicest modern OEM Porsche wheels IMO.

evilfij

That is what there is a set of locally. 991.1 GTS. How different is the offset? Do you know?

Mech33

The PET lists two different CL wheels for the 991.1 GTS:

1:
Front - 9" x 20" ET51
Rear - 11.5" x 20" ET48

2:
Front - 8.5" x 20" ET51
Rear - 11" x 20" ET52


And here is the 991.1 GT3:
991.1 GT3:
Front - 9" x 20" ET55
Rear - 12" x 20" ET47

I assume the narrower GTS wheels are the winter set. Using the wider ones as reference, the front GTS wheels stick out 4mm more than the GT3 fronts, and the GTS rear wheels stick out ~8 mm *less* than the GT3 rears.

evilfij

Humm. Thanks for the information. I could not find it online.

The winter wheel set for a GT3 is:

Front - 9" x 20" ET51 - 245/35 R20
Rear - 11" x 20" ET59 - 295/30 R20

So the fronts will work, but the rears may be an issue. However, you get 5mm more clearance on the inside and 7mm closer in on the outside so it should be fine.

scb997

The winter wheel/tire set from Porsche, for the GT3, IS the Turbo S wheels. Originally, you could only get snows in the 295 width which was a little too narrow for the 12" GT3 rears. So, I know that the Turbo S wheels fit fine - that's what I run in the winter...

Scott

evilfij

Actually the style is the Turbo S wheel, but it is an 11in wide rear so unique to the winter wheel package. And believe it or not, the Winter turbo S rear wheel is different between the GT3/turbo and the GTS.

For reference the factory 2017/2018 turbo S wheels are:

9 x 20 ET 51 with 245/35 ZR 20 tires (front)
12 x 20 ET 56 with 305/30 ZR 20 tires (rear)