amre

I know the 991.2 has a wider rear wheel (i.e. 11.5 vs 11) but the offset is higher so there really is no change, assuming the chassis is the same.

Front is the same with a 2mm difference in offset so the rim is evenly distributed to the inside and outside of the mounting hub by 1mm in each direction. That's negligible.

Rear wheel is 1/2" wider with a 6mm greater offset. This means the amount of wheel to the inside of the mounting hub increased by 12mm and remained unchanged to the outside. In essence, there is more contact patch on the inside part of the hub.

The question is whether the track has changed or if it remained the same. The reason I'm asking is to determine whether I can use a 991.1 fitment to build aftermarket wheels or if I'd have to measure the new car.

Any thoughts on this?

ace37

Good question. I'm ordering a 991.2 and thinking about getting winter wheels...

ZerOG

This thread seems to have died before the info was posted.

Does anyone have the exact specs and offsets of the 991.1 and 991.2 OEM 20'' wheels?

stout

A lot of people get this wrong, including Tire Rack and famous wheel makers...
https://rennlist.com/forums/991/1106...-2-wheels.html

Pilot12

ET 50 front and ET 70 rear are the offsets i believe for narrow body 991.1. 20” 8.5 and 11x20.

BGLeduc

The Porsche “Good to Know” app has all of the wheel/tire specs for all of the 991 variants.

stout

From that other thread:

991.1 Carrera-line narrow body offsets for 20-inch wheels:
Front - 8.5 x 20 ET51 - 245/35 ZR 20 (91Y)
Rear - 11 x 20 ET70 - 295/30 ZR 20 (101Y) XL

991.2 Carrera-line narrow-body offsets for 20-inch wheels:
Front - 8.5 x 20 ET 49 - 245/35 ZR 20
Rear - 11.5 x 20 ET 76 - 305/30 ZR 20 (note: offset "only" changed 6mm, but wheel is further out in fender, as if on a spacer, also)



991.1 Carrera-line wide-body offsets for 20-inch wheels:
Front - 8.5 x 20 ET 51 - 245/35 ZR 20
Rear - 11 x 20 ET 52 - 305/30 ZR 20

991.2 Carrera-line wide-body offsets for 20-inch wheels:
Front - 8.5 x 20 ET 49 - 245/35 ZR 20
Rear - 11.5 x 20 ET 56 - 305/30 ZR 20

^ Above is best of my knowledge, and I encourage others to check the info; PCNA's configurator lists a number of 991.2 S/4S/GTS offsets incorrectly, which doesn't help matters. Please also note that there is an "XXL" extra wide body for the 991, used for the 911 Turbo/S and GT3/GT2 RS—but those live in their own forums.

koven

removing incorrect info

ZerOG

Yeah, I finally found your thread and want to thank you for all the work you’ve done.

I’m getting some wheels custom made and almost got the wrong offset because the manufacturer hadn’t done them for a 991.2 yet.

ShaunP

FWIW the rears on my 991.2 (narrow body)are 20x11 +55. I had to go down to a 295 tire or it would rub. With the 295 it fits perfectly.

ZerOG

@+55 I don’t doubt it.

My plans are for the opposite. I’m looking to fit some 315 or 325 and don’t care much for rims that are flush to the fenders. Just plenty of sidewall for maximum handling.

stout

^ Your car looks great in your avatar. Any way to tempt you into posting a larger pic?

ShaunP

Only decent picture I have.

stout

You are welcome, though the "work" amounted to fitting the rears with two different tires (Pirelli sidewalls slant inward more than Michelin 4S sidewalls) to see if we could get away with it. Verdict, nope. Somewhere between the first fitment of the OE Michelins and the Pirellis, I looked at the offsets I had previously trusted wheel people to get right. Lesson learned, and mainly wanted to share that.


Thank you for sharing this—it shows just how special Guards Red (and a narrow-body 991) can look these days. Couldn't resist GR on my GT4, and sometimes wonder if I would have been happier with it on my 911. I have a real love/hate relationship with red cars...but certain cars look fantastic in red. Yours is one of them, and doesn't need a bunch of bodywork or other overt visual tweaks.

With springs and wheels, this 991 is right in line with the way Porsche designers dream about the cars and sketch them—and the way dialed-in 911s owned by enthusiasts have looked since the long-hood days. It's a personal preference, but it's why I prefer a 911 SC with the right wheels/tires and ride height to an as-delivered 930. It's also a lot of what sells all of us on RSs, GT3s, GT2s, etc.

ShaunP

Thanks. My car is also lowered with Techart springs. I have a real love/ hate relationship with Guards Red. I love it until I see it next to my friends Carmine Red.

Also so thinking of changing the wheels up a bit. I really like the wheel design but cleaning is real pita and now I’m wishing they were a bit darker.