The 992.1 GT3 RS rides on a centerlock hub with a single central nut, a wider body than the GT3, and 20-inch 10J fronts with 21-inch 13J rears at factory offsets of ET45 front and ET31 rear. This guide covers the 2023–2025 GT3 RS, its magnesium and lightweight factory wheels, documented aftermarket setups and brake clearance.
About this guide: Fitment data is compiled from customer cars in wheel-maker fitment galleries, owner posts and classifieds on Rennlist's 992 GT3 forum, cross-checked against vendor fitment documentation. Use it as research for your build; ride height, tires, and alignment are your installer's call.
Pricing forged wheels for your 992 GT3 RS? Full sets from $4,150 in 20″/21″.See your exact price →
OEM Setups
Factory Wheel & Tire Configurations
Every 992.1 GT3 RS shares the hardware below. Porsche approves one 20/21-inch summer size on 275/35ZR20 front and 335/30ZR21 rear tires, in standard forged aluminum, Weissach Package forged magnesium or a weight-optimized forged aluminum set. The standard wheel, 10J ET45 / 13J ET31, is the reference for every "mm out" figure below.
The standard GT3 RS wheel, forged aluminum on the centerlock hub, a half-inch wider at the front and an inch wider at the rear than the GT3's. Porsche approves it on Michelin Pilot Sport Cup 2, Goodyear Eagle F1 SuperSport R and Pirelli P Zero Corsa tires. Its ET45 front and ET31 rear are the reference for every ladder below.
20″/21″ GT3 RS Magnesium Wheel (Centerlock)
Optional — Weissach Package
Front Wheel10J×20 ET45
Rear Wheel13J×21 ET31
Front Tire275/35ZR20
Rear Tire335/30ZR21
ConstructionForged Magnesium
Part NumbersFront 9GT.601.025.AL · Rear 9GT.601.025.AM
Applies ToGT3 RS (2023–2025) with the Weissach Package · centerlock hub
The lightweight forged magnesium wheel offered with the Weissach Package, on the same sizes and offsets as the standard wheel, so it sits in exactly the same place. Owners commonly fit a second set for track days to keep these off the curbs. Magnesium needs pH-neutral wheel cleaners; strong alkaline or acid cleaners damage the finish.
A weight-optimized forged aluminum set sold through Porsche parts, about 1.3 kg lighter than the standard wheels per its listing, at the factory sizes and offsets. It's the aluminum alternative for owners who want a lighter set without magnesium's care needs. Check the stamp on any used set, since GT3 and GT3 RS wheels look alike.
20″/21″ GT3 RS Winter Fitment
Winter — GT3 RS
Front Wheel9J×20 ET43
Rear Wheel11.5J×21 ET46
Front Tire245/35R20
Rear Tire305/30R21
ConstructionAluminum Alloy
Applies ToGT3 RS (2023–2025) · centerlock hub
Porsche approves the GT3's winter wheel on the GT3 RS: 9J ET43 front and 11.5J ET46 rear on Michelin Pilot Alpin 5 or Goodyear UltraGrip Performance winter tires. On the wider RS it sits well inside the summer wheel, about 11mm at the front and 34mm at the rear by the lip formula. Snow chains are approved on the rear axle only.
Aftermarket Options
Aftermarket Wheel & Tire Configurations
Every card below is one wheel size, and every row is one documented GT3 RS build at its offset. Most owners keep the factory size and change the construction, often for a track set. The factory wheel already fills the wider body, so documented builds stay close to stock. 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.
The GT3 RS uses a wider body than the GT3, with 10J ET45 fronts and 13J ET31 rears. GT3, GT3 Touring and S/T builds sit far inside it, and GT3 RS builds sit too far out on those cars. Use GT3 RS builds like the ones on this page.
20-inch fronts with the factory brakes.
The standard 408mm steel front brakes and the optional 410mm ceramic (PCCB) brakes both sit behind a 20-inch front wheel. A 19-inch set needs an aftermarket front brake kit with a smaller caliper. Tell us which brakes your car has so caliper clearance is checked.
Centerlock only, and the recall.
Every GT3 RS uses a single central locking nut torqued to 600 Nm with a calibrated tool; the hub has no provision for spacers, so every offset has to be built into the wheel. Rear-axle steering is standard. Some 2021–2024 centerlock 911s, including this model, are part of Porsche's center-lock recall (NHTSA 24V809, expanded in 2026 as 26V682). Check your VIN with a dealer before changing wheels.
Staggered Setup
Most Popular
Stance rangeflush → poke
OEM
Aggressive
RWD onlyTrack
Front Wheels
20×10
Documented ET45 – ET45
Rear Wheels
21×13
Documented ET30 – ET31
Documented offsetsLip position vs. stock · F 10J ET45 · R 13J ET31
ET45 / ET31
992.1 GT3 RS (four cars) · factory sizes and offsets · customer cars in a vendor gallery: two on 275/35R20 / 335/30R21 Nankang CR-S, one on Michelin Pilot Sport Cup 2 R, one on 285/30R20 / 335/30R21 Nankang CR-S · a vendor fitment guide lists this size as clearing the factory steel and ceramic brakes
Front0mm outRear0mm out
ET45 / ET30
992.1 GT3 RS · owner set sold after use on the car · 275/35R20 / 335/30R21 Goodyear Eagle F1 SuperSport R factory tires
Front0mm outRear1mm out
Sources
Well-documented
5 community
1 vendor
The documented GT3 RS aftermarket path keeps the factory 10J ET45 / 13J ET31 wheel and changes the construction, usually to save the factory magnesium or aluminum sets from track wear. One owner's set runs an ET30 rear, 1mm further out. Factory 275 / 335 tires fit, and one car runs a 285 front.
Stanceflush → poke
OEM
Aggressive
RWD onlyShow
Front Wheels
21×10 ET39
Rear Wheels
22×12.5 ET20
Documented buildLip position vs. stock · F 20″ 10J ET45 · R 21″ 13J ET31
ET39 / ET20
992.1 GT3 RS · owner build with euro side markers and painted wing end plates · tires and ride height not reported
Front6mm outRear5mm out
Sources
Documented
1 community
A plus-one appearance build: 21-inch fronts and 22-inch rears, with the rear a half-inch narrower than the factory 13J. Even so, the lower offset puts the face about 6mm out at the front and 5mm at the rear. The owner later added a rear spacer on the centerlock hub, which Porsche doesn't provide for; this row lists the wheel as built.
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Built to the exact spec, not the closest one on a shelf. The setups above come from real 911 GT3 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 911 GT3 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 911 GT3 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.
Forged aluminum 20/21-inch centerlock wheels: 10J×20 ET45 front on 275/35ZR20 and 13J×21 ET31 rear on 335/30ZR21 tires. Forged magnesium wheels came with the Weissach Package, and Porsche also sells a weight-optimized forged aluminum set; all three share the same sizes and offsets, so they sit in the same place on the car.
What hardware does the 992.1 GT3 RS use?
Every 992.1 GT3 RS uses 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 this car is made for the centerlock hub.
What aftermarket wheel sizes are documented on the 992.1 GT3 RS at stock ride height?
Most documented builds keep the factory 20×10 ET45 / 21×13 ET31 size, on four customer cars and in a vendor fitment guide, often as a track set to protect the factory wheels. One owner's set used an ET30 rear. A 21/22-inch appearance build is the only documented step out. Ride height wasn't reported on these builds.
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 is one documented build at its offset. The Front and Rear figures show how far the outer lip sits outside the factory 10J ET45 / 13J ET31 wheel. The GT3 RS factory wheel already fills its wider body, so documented builds stay within about 6mm of stock; the 21/22-inch build is the aggressive end.
Can I run 19-inch wheels on the 992.1 GT3 RS?
Not with the factory front brakes. The standard 408mm steel brakes and the optional 410mm ceramic (PCCB) brakes both sit behind 20-inch wheels from the factory. Owners do discuss 19-inch track sets with aftermarket front brakes, but we haven't found an owner build with complete offsets, so none is listed here. Tell us which brakes your car has.
Why is there no square setup on the GT3 RS?
Every factory GT3 RS package is staggered, 10-inch fronts and 13-inch rears, and every aftermarket build we documented is staggered too, so there are no square builds to show. The GT3 RS is rear-wheel drive, so a front-to-rear rolling diameter change doesn't stress a center differential, but it does change how the car balances on track.
Can I use wheel spacers on the 992.1 GT3 RS?
Porsche doesn't provide spacers for the centerlock hub, and the centerlock nut is designed to clamp the wheel directly to the hub. One owner reports adding a rear spacer anyway; we list his build at the wheel's own offset. FMB machines the offset you choose directly into the wheel, so a spacer isn't needed.
What are the factory winter wheel options for the 992.1 GT3 RS?
Porsche approves the GT3's winter fitment on the GT3 RS: 9J×20 ET43 front and 11.5J×21 ET46 rear on 245/35R20 and 305/30R21 winter tires, such as the Michelin Pilot Alpin 5. On the wider RS it sits about 11mm inside the summer wheel at the front and 34mm at the rear. Snow chains are approved on the rear axle only.
Which model years does this guide cover?
Model years 2023–2025 for the 992.1 GT3 RS, with or without the Weissach Package. The 10th VIN character reads P, R or S on these cars. All of them use the same factory wheel sizes and offsets. Some are part of Porsche's center-lock recall (NHTSA 24V809, expanded in 2026 as 26V682), so check your VIN with a dealer before changing wheels.
Do 992.1 GT3 wheels fit the GT3 RS?
Not as a matched setup. Both use centerlock hubs, but the GT3's 9.5J×20 ET46 front sits about 7mm inside the RS front and its 12J×21 ET45 rear about 27mm inside the RS rear. RS wheels on a GT3 sit that far outside its narrower body. See our 992.1 GT3 guide and 992.1 Turbo guide.
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