The 991 GT3 RS and GT2 RS share a centerlock hub, one central nut torqued to 600 Nm, the wide body and the same staggered wheels: 9.5J×20 ET50 front and 12.5J×21 ET48 rear. This guide covers 2016–2019 cars, 19-inch track setups, the rear control-arm bolt they need, and ceramic brake clearance.
About this guide: Fitment data is compiled from owner builds on Rennlist and customer cars in wheel-maker fitment galleries, cross-checked against vendor fitment documentation and Porsche's approved wheel certificates. Use it as research for your build; ride height, tires, and alignment are your installer's call.
Pricing forged wheels for your 991 GT3 RS? Full sets from $3,750 in 19″, or $4,150 in 20″/21″.See your exact price →
OEM Setups
Factory Wheel & Tire Configurations
Every car in this guide runs the same factory size: 9.5J×20 ET50 front and 12.5J×21 ET48 rear on 265/35ZR20 and 325/30ZR21 tires, the reference for every "mm out" figure below. The cars differ in wheel material and brakes, not in fitment.
Part NumbersFront 991.362.162.84 · Rear 991.362.167.85
Applies To911 GT3 RS (2019) · centerlock
The 991.2 GT3 RS's standard forged centerlock wheel and the reference for every "mm out" figure on this page. Porsche's certificate lists one summer size for the GT3 RS and GT2 RS, on Michelin Cup 2, Cup 2 R or Dunlop Sport Maxx Race 2 tires, with no snow chains on the summer set. Steel brakes were standard.
20/21″ GT3 RS Wheel (991.1)
Standard — 991.1 GT3 RS
Front Wheel9.5J×20 ET50
Rear Wheel12.5J×21 ET48
Front Tire265/35ZR20
Rear Tire325/30ZR21
ConstructionForged Aluminum
Applies To911 GT3 RS (2016) · centerlock
The 991.1 GT3 RS's forged centerlock wheel, in the same 9.5J ET50 / 12.5J×21 ET48 size as the 991.2, so every setup on this page applies to both. Porsche's 991.1 certificate lists this size for the GT3 RS. Steel brakes were standard and ceramic brakes (PCCB) optional.
20/21″ GT2 RS Wheel
Standard — GT2 RS
Front Wheel9.5J×20 ET50
Rear Wheel12.5J×21 ET48
Front Tire265/35ZR20
Rear Tire325/30ZR21
ConstructionForged Aluminum
Part NumbersFront 991.362.162.83 · Rear 991.362.167.84
Applies To911 GT2 RS (2018–2019) · centerlock
The GT2 RS's standard forged centerlock wheel, at the same size and offsets as the GT3 RS. Ceramic brakes (PCCB), 410mm front and 390mm rear, were standard on the GT2 RS, so any wheel for it has to clear PCCB. Porsche approves the same summer tires for both cars.
20/21″ Magnesium Wheel (Weissach Package)
Optional — Weissach Package
Front Wheel9.5J×20 ET50
Rear Wheel12.5J×21 ET48
Front Tire265/35ZR20
Rear Tire325/30ZR21
ConstructionForged Magnesium
Part NumbersFront 991.362.163.83 · Rear 991.362.168.84
The forged magnesium wheel offered with the Weissach Package on the GT2 RS and the 991.2 GT3 RS. Porsche lists it at the same 9.5J ET50 / 12.5J×21 ET48 size and part numbers for both cars, so it fits exactly like the aluminum wheel.
Porsche's winter fitment for the 991.2 RS models uses the 20-inch GT3-size wheel, 9J ET55 front and 12J ET47 rear, on 245/35R20 / 315/35R20 Pilot Alpin tires, with rear snow chains only. It sits 11mm further in at the front and 5mm further in at the rear than the summer wheels.
Aftermarket Options
Aftermarket Wheel & Tire Configurations
Every card below is one wheel size, and every row is one documented build at its effective offset. 991.1 and 991.2 GT3 RS and the GT2 RS share the hub, body and factory wheel size, so a build from one applies to the others when the brakes match. Every documented build is staggered.
Tap a setup to jump to its full card. Fit: Bolt-on = documented at stock ride height with no fender work reported · Lowered = documented on lowering springs or coilovers · Not reported = owners didn't say. Sources = owner builds (including customer cars in vendor galleries) and vendor fitment-guide setups documented on that card.
A vendor lists the 410mm ceramic brakes (PCCB), standard on the GT2 RS and optional on the GT3 RS, as needing 20-inch wheels. Every 19-inch setup here is documented on the 380mm steel brakes only. Tell us which brakes your car has so caliper clearance is checked before forging.
19-inch wheels and the rear control-arm bolt.
With a 19-inch rear, the inner barrel sits close to the head of a factory rear lower control-arm bolt. A vendor lists swapping it for Porsche's 72mm pan-head bolt (999.073.530.01) as required for 19-inch wheels. Plan on it before ordering any 19-inch set.
Centerlock only, no spacers.
Every car in this guide uses a single central locking nut torqued to 600 Nm with a calibrated tool. The hub takes no spacers, so every offset has to be built into the wheel. Rear-axle steering is standard; tell us when you order so the inner barrel is checked.
Staggered Setup
Most Popular
Stanceflush → poke
OEM
Aggressive
RWD onlyTrack
Front Wheels
19×10 ET42
Rear Wheels
19×13 ET45
Documented buildLip position vs. stock · F 20″ 9.5J ET50 · R 21″ 12.5J ET48
ET42 / ET45
Steel brakes only991.1 GT3 RS and three 991.2 GT3 RS · customer cars in a vendor gallery and a vendor fitment guide · 265/35R19 / 325/30R19 Michelin Pilot Sport Cup 2 on two cars, 295/30R19 / 345/30R19 Hoosier or racing slicks on the other two · track alignments listed, plus camber plates or flipped factory RS top mounts on the 295 / 345 car
Front14mm outRear9mm out
Sources
Well-documented
4 community
1 vendor
The most documented 991 RS size: a 19-inch track set with a 10-inch front and 13-inch rear, 14mm out front and 9mm at the rear. Four cars run it. On 265 / 325 tires the gallery cars list a track alignment; on 295 / 345 tires they add camber plates or flipped RS top mounts. It needs steel brakes and the rear bolt swap.
Stanceflush → poke
OEM
Aggressive
RWD onlyDaily
Front Wheels
20×9.5 ET50
Rear Wheels
21×12.5 ET48
Documented buildLip position vs. stock · F 9.5J ET50 · R 21″ 12.5J ET48
ET50 / ET48
Stock height991 GT3 RS and GT2 RS · vendor fitment guide · factory sizes and offsets · 265/35R20 / 325/30R21 · listed as fitting with no changes, over steel or ceramic brakes
Front0mm outRear0mm out
Sources
Documented
1 vendor
The factory sizes and offsets, built as an aftermarket wheel: 20×9.5 ET50 with a 21×12.5 ET48 rear, level with the factory wheels at both ends. A vendor fitment guide lists it as a street and track setup with no changes. It's the only documented size that clears the ceramic brakes, so it's the one for a GT2 RS.
Stanceflush → poke
OEM
Aggressive
RWD onlyTrack
Front Wheels
19×9.5 ET50
Rear Wheels
20×12.5 ET48
Documented buildLip position vs. stock · F 20″ 9.5J ET50 · R 21″ 12.5J ET48
ET50 / ET48
Stock heightSteel brakes only991 GT3 RS · vendor fitment guide · 265/35R19 / 325/30R20 · listed as fitting with no changes over the steel brakes · fewer tire choices in these sizes
Front0mm outRear0mm out
Sources
Documented
1 vendor
A smaller-diameter set at the factory widths and offsets: 19×9.5 ET50 with a 20×12.5 ET48 rear, level with the factory lips. A vendor lists it as a popular street and track setup that fits with no changes. The 19-inch front needs steel brakes, and tire choice in these sizes is mostly track-focused.
Stanceflush → poke
OEM
Aggressive
RWD onlyTrack
Front Wheels
19×9.5 ET50
Rear Wheels
19×12 ET46
Documented buildLip position vs. stock · F 20″ 9.5J ET50 · R 21″ 12.5J ET48
ET50 / ET46
Steel brakes only991.2 GT3 RS · customer car in a vendor gallery · 265/35R19 / 325/30R19 Michelin Pilot Sport Cup 2 · track alignment with extra front camber · light changes listed
Front0mm outRear4mm in
Sources
Documented
1 community
A milder 19-inch track set: 19×9.5 ET50 with a narrower 19×12 ET46 rear, level with the factory front and 4mm inside the factory rear. One GT3 RS runs it on Cup 2 tires with a track alignment. It needs steel brakes and, like every 19-inch rear, the control-arm bolt swap in the platform notes.
Stanceflush → poke
OEM
Aggressive
RWD onlyTrack
Front Wheels
19×10 ET42
Rear Wheels
19×12 ET46
Documented buildLip position vs. stock · F 20″ 9.5J ET50 · R 21″ 12.5J ET48
ET42 / ET46
Steel brakes only991 GT3 RS · vendor fitment guide · 265/35R19 / 325/30R19 · the 19×10 ET42 front of the 19×13 setup with a 12-inch rear to reduce rear tire stretch
Front14mm outRear4mm in
Sources
Documented
1 vendor
The 19×10 ET42 front from the most documented setup, paired with a 19×12 ET46 rear: 14mm out front and 4mm inside the factory rear. A vendor lists the 12-inch rear as an option for 325 tires, to cut tire stretch. Treat it as a track setup with the same camber and bolt changes as the 19×13 set.
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Built to the exact spec, not the closest one on a shelf. The setups above come from real 991 GT3 RS and GT2 RS builds, and we CNC-machine every wheel to them directly. If a build needs a spacer to reach its offset, we machine that offset into the wheel instead.
Choose your setup.
This guide is built to give you what you need to pick a spec with confidence: documented 991 GT3 RS and GT2 RS builds, tire sizes, and how each one fits. If you still have questions, we're happy to help before you order.
Engineering verification.
Our manufacturing partner confirms wheel specs, including bolt pattern, center bore, brake caliper clearance, backspacing and load rating.
Render approval.
You approve the design and final specs before we move forward with production.
Our fitment guarantee
Every set is guaranteed to mount on your 991 GT3 RS or GT2 RS: made for the factory centerlock hub and its central nut, with no spacers or adapters, and made to the exact width and offset you approved.
How a setup sits on your car also depends on ride height, tires and alignment, so choose with your plans in mind.
The 2016 991.1 GT3 RS, the 2019 991.2 GT3 RS and the 2018–2019 GT2 RS. There was no 2017 or 2018 GT3 RS in the US. In the VIN, the 10th character is G for 2016, J for 2018 and K for 2019. The GT3, GT3 Touring, 911 R and Speedster have their own guide.
What are the factory wheel specs on the 991 GT3 RS and GT2 RS?
Both run forged 20/21-inch centerlock wheels: 9.5J×20 ET50 front on a 265/35ZR20 tire and 12.5J×21 ET48 rear on a 325/30ZR21. The aluminum and Weissach magnesium wheels share the same size and offsets, so every setup on this page applies to both cars when the brakes match.
What hub and hardware do the 991 GT3 RS and GT2 RS use?
Both use a centerlock hub, a single central locking nut in place of lug bolts, so there's no bolt pattern or lug seat to match. Porsche specifies 600 Nm (443 lb-ft), applied with a calibrated centerlock tool, never an impact wrench. An FMB set for these cars is made for the centerlock hub.
What aftermarket wheel sizes are documented on the 991 GT3 RS at stock ride height?
A vendor fitment guide lists two setups with no changes: the factory 20×9.5 ET50 / 21×12.5 ET48 sizes, and a 19×9.5 ET50 / 20×12.5 ET48 set for steel-brake cars. Both keep the factory lip positions, and the vendor lists both as fitting with no clearance changes at stock ride height.
How do I read the offset ladder on each card, and what's the difference between flush and aggressive?
Each card is one wheel size and each row one documented build at its effective offset. The Front and Rear figures show how far the outer lip sits outside the factory 9.5J ET50 / 12.5J×21 ET48 wheel. The stance dots place each setup within the range documented on the 991 RS cars, from the mild end to the aggressive end.
What wheel sizes clear the 991 GT3 RS and GT2 RS brakes?
The GT3 RS's standard 380mm steel brakes clear the documented 19-inch wheels. A vendor lists the 410mm front ceramic brakes (PCCB), standard on the GT2 RS and optional on the GT3 RS, as needing 20 inches. FMB's engineering check confirms caliper clearance for your brakes before forging.
What do 19-inch wheels need on a 991 GT3 RS?
Steel brakes, and a swap of the rear lower control-arm bolt whose head sits close to a 19-inch rear barrel; a vendor lists Porsche's 72mm pan-head bolt (999.073.530.01). The documented 19-inch cars run track alignments, and the widest tires add camber plates or flipped factory RS top mounts.
Why is there no square setup on the 991 GT3 RS?
Every factory and documented 991 RS setup is staggered, with the rear 2.5 to 3 inches wider than the front, and we couldn't find a square setup with published offsets. Both cars are rear-wheel drive, so there's no front-to-rear rolling diameter limit, but tire sizes still need checking against your owner's manual.
Can I use wheel spacers on the 991 GT3 RS or GT2 RS?
No. The centerlock hub has no provision for spacers, and Porsche's certificates list none, so every offset on these cars has to be built into the wheel itself. That's why every row on this page is a wheel built at its listed offset. FMB machines the offset you choose directly into the wheel.
What are the factory winter wheel options?
For the 991.2 GT3 RS and GT2 RS, Porsche approves the 20-inch GT3-size wheel, 9J ET55 front and 12J ET47 rear, on 245/35R20 / 315/35R20 winter tires, with snow chains on the rear only. It sits 11mm further in at the front and 5mm further in at the rear than the summer wheels. FMB can build a winter set to the same sizes.
Will 991 GT3 or Turbo wheels fit a GT3 RS or GT2 RS?
The centerlock hub is shared, but sizes differ. GT3 wheels (9J ET55 / 12J ET47) sit 11mm in at the front and 5mm in at the rear, which is Porsche's winter fitment for these cars. Turbo S centerlock wheels sit further in again. The 991 GT3 guide and 991 Turbo guide cover those cars.
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