I recently purchased 2013 991.1 carrera base.
It has OEM 20” carrera S wheels.
I was searching for aftermarket wheels for secondary sets and ran into some questions. Apologies first, I’m very noob at this.
First, this is specs for wheels and tires on each models.

Wheel Dimensions:
Carrera/Carrera S
- Front - 8.5 x 20 ET 51
- Rear - 11 x 20 ET 70
Carrera 4/Carrera 4S/ Targa / GTS
- Front - 8.5 x 20 ET 51
- Rear - 11 x 20 ET 52

Recommended Tire Dimensions (not included):
Carrera/Carrera S
- Front - 245/35 ZR 20 (91Y)
- Rear - 295/30 ZR 20 (101Y) XL
Carrera 4/Carrera 4S/ Targa / GTS
- Front - 245/35 ZR 20
- Rear - 305/30 ZR 20 (103Y) XL

1. I found my tires are not matching with the recommendation. My dealer put new Pirellis on all four. But those are
- Front - 245/35 ZR 20 (95Y)
- Rear - 305/30 ZR 20 (103Y) XL
which is in 4,4S, GTS zone. Wide body.
Is this OK ?

2. The aftermarket wheels I found is Ferrada forged F8-FR8 matte bronze. Here are the specs.
Staggered full Set -
(2) 20x9 Ferrada Forge-8 FR8 Matte Bronze (Rotary Forged)
(2) 20x11 Ferrada Forge-8 FR8 Matte Bronze (Rotary Forged)
- in this case, first can I put these wheels? The seller says it fits into 991. Can I put front 9, rear 11 ?
- if I can put these wheels, can I swap my current tires ?
- Front - 245/35 ZR 20 (95Y)
- Rear - 305/30 ZR 20 (103Y) XL

thanks !

 

The 305's on the rear are ok. Most owners are going in that direction. As far as any aftermarket wheels, the most important spec is the offsets. The offset determines how far the wheel sits in the wheel well. You don't give the offset of the Ferrada wheels. You want to have offsets close to your original. With 9" and 11" the tires will fit fine. I have 305's on a 12" wheel.

 

This is a handy references when comparing one wheel to another.

https://www.1010tires.com/Tools/Wheel-Offset-Calculator

 

- Front - 245/35 ZR 20 (95Y)
- Rear - 305/30 ZR 20 (103Y) XL

that is indeed the 4 GTS spec for 991.2 That car has 9x20 front and 12x20 rears. At least in center locks.

 

Offsets are both 45mm front/rear, they say it fits on my 2013 carrera 2 base model narrow body.
just want confirmation from the experts

 

If I'm understanding this you have a 51 offset on the front and a 70 offset on the rear. They want you to put wheels with a 45 offset on both front and rear. Sorry that will not look right at all. It might be ok for an S4, but not for your base Carrera. Time to look elsewhere.

 

+45 rear will not work with narrow body, it will sit past the fenders