The 991 GT3, GT3 Touring, 911 R and Speedster share a centerlock hub, one central nut torqued to 600 Nm, and the same 20-inch wheels: 9J ET55 front and 12J ET47 rear. This guide covers 2014–2019 cars, the rear control-arm bolt that 19-inch wheels need, ceramic brake clearance and documented owner setups.
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? Full sets from $3,750 in 19″, or $4,000 in 20″.See your exact price →
OEM Setups
Factory Wheel & Tire Configurations
Every car in this guide runs the same factory size: 9J×20 ET55 front and 12J×20 ET47 rear on 245/35ZR20 and 305/30ZR20 tires, the reference for every "mm out" figure below. The cars differ in wheel design and brakes, not in fitment.
The 991.2 GT3's standard forged centerlock wheel, carried over to the GT3 Touring. It's the reference for every "mm out" figure on this page. Porsche's certificate for the 991.2 GT3, Touring and Speedster lists only this size for summer tires, and no snow chains on the summer set.
20″ GT3 Wheel (991.1)
Standard — 991.1 GT3
Front Wheel9J×20 ET55
Rear Wheel12J×20 ET47
Front Tire245/35ZR20
Rear Tire305/30ZR20
ConstructionForged Aluminum
Applies To911 GT3 (2014–2016) · centerlock
The 991.1 GT3's standard forged centerlock wheel, in the same 9J ET55 / 12J ET47 size as the 991.2, so every setup on this page applies to both. Porsche's current 991.1 certificate lists the same part numbers as the 991.2 wheel. It came with steel brakes as standard and ceramic brakes as an option.
20″ 911 R Wheel
Standard — 911 R
Front Wheel9J×20 ET55
Rear Wheel12J×20 ET47
Front Tire245/35ZR20
Rear Tire305/30ZR20
ConstructionForged Aluminum
Applies To911 R (2016) · centerlock
The 911 R's forged 20-inch centerlock wheel, listed by Porsche as the 20-inch GT3 size. The 911 R came with ceramic brakes (PCCB) as standard, with 410mm front and 390mm rear rotors, so any wheel for it has to clear PCCB. Porsche's certificate approves the GT3 sizes and tires for the 911 R.
20″ Speedster Wheel
Standard — Speedster
Front Wheel9J×20 ET55
Rear Wheel12J×20 ET47
Front Tire245/35ZR20
Rear Tire305/30ZR20
ConstructionForged Aluminum
Applies To911 Speedster (2019) · centerlock
The Speedster's forged 20-inch centerlock wheel, painted satin black as standard. Porsche lists the Speedster with the GT3 on one certificate, at the same 9J ET55 / 12J ET47 size. Ceramic brakes (PCCB) were standard, so wheels for it need 20-inch caliper clearance.
20″ Porsche Winter Wheels (Turbo Sport II)
Winter — all models
Front Wheel9J×20 ET51
Rear Wheel11J×20 ET59
Front Tire245/35R20
Rear Tire295/30R20
ConstructionForged Aluminum
Part NumbersFront 991.362.162.34 · Rear 991.362.166.34
Porsche's centerlock winter set uses Turbo Sport II wheels on 245/35R20 / 295/30R20 tires: 4mm further out at the front and 25mm further in at the rear than the summer wheels. Rear snow chains are listed for the 295/30R20 tire. Porsche's 991.1 certificate lists the 911 R winter tire sizes without a wheel.
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 GT3s, the Touring, the 911 R and the Speedster share the hub, body and factory wheel size, so a build from one applies to all of them. 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.
On the documented 19-inch builds, the rear wheel's inner barrel sits close to the head of a factory rear lower control-arm bolt. Owners and a vendor swap it for Porsche's 72mm pan-head bolt (999.073.530.01) or turn the factory bolt around. Plan on it before ordering any 19-inch set.
Ceramic brakes and 19-inch wheels.
A vendor lists the 410mm ceramic brakes (PCCB), standard on the 911 R and Speedster and optional on the GT3, as needing 20-inch wheels; only one owner documents 19s over them. The 380mm steel brakes clear the documented 19-inch wheels. Tell us which brakes your car has so caliper clearance is checked.
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
Stance rangeflush → poke
OEM
Aggressive
RWD onlyTrack
Front Wheels
19×9.5
Documented ET48 – ET50
Rear Wheels
19×12
Documented ET46 – ET47
Documented offsetsLip position vs. stock · F 20″ 9J ET55 · R 20″ 12J ET47
ET50 / ET47
991.1 GT3 · customer car in a vendor gallery · 265/35R19 / 325/30R19 Michelin Pilot Sport Cup 2 · rear control-arm bolt swap listed
Front11mm outRear0mm out
ET50 / ET46
991.1 GT3 (three cars), 991.2 GT3 (six cars) and a 991.2 GT3 Touring · customer cars in a vendor gallery · 265/35R19 / 325/30R19 on Michelin Pilot Sport Cup 2, Goodyear Eagle F1 SuperCar 3R, Continental ExtremeContact Force or Nankang AR-1 (one 991.1 on a 255/35R19 front) · rear control-arm bolt swap listed · a vendor fitment guide lists the same setup
Front11mm outRear1mm out
ET48 / ET46
991.2 GT3 · customer car in a vendor gallery · 265/35R19 / 325/30R19 Michelin Pilot Sport Cup 2 · rear control-arm bolt swap listed · a vendor fitment guide lists ET50 or ET48 fronts
Front13mm outRear1mm out
Sources
Well-documented
12 community
1 vendor
The most documented 991 GT3 size: a 19-inch track set with a 9.5-inch front for a 265 tire and the factory 12-inch rear width. Twelve cars run it, almost all at ET50 / ET46. The gallery builds list swapping a rear lower control-arm bolt for clearance, and a vendor suggests at least -2° of front camber.
Stanceflush → poke
OEM
Aggressive
RWD onlyDaily
Front Wheels
20×8.5 ET47
Rear Wheels
20×11 ET35
Documented buildLip position vs. stock · F 9J ET55 · R 12J ET47
ET47 / ET35
991.2 GT3 Touring · owner build on custom 20-inch wheels · Bridgestone all-season tires · owner chose narrower widths to run tires other than the factory sizes without stretching them
Front2mm outRear1mm in
Sources
Documented
1 community
A narrower street set: 20×8.5 ET47 with a 20×11 ET35 rear, which keeps both lips within about 2mm of the factory GT3 wheels. One GT3 Touring owner runs it on all-season tires for the street and keeps the factory wheels for track days. It suits narrower street tire sizes.
Stanceflush → poke
OEM
Aggressive
RWD onlyTrack
Front Wheels
19×9 ET52
Rear Wheels
19×12 ET47
Documented buildLip position vs. stock · F 20″ 9J ET55 · R 20″ 12J ET47
ET52 / ET47
991 GT3 · owner build · 265/35R19 / 325/30R19 Hoosier R7 · track wheels, run until the owner moved to a GT3 RS
Front3mm outRear0mm out
Sources
Documented
1 community
The mildest 19-inch setup: the factory 9-inch front and 12-inch rear widths at ET52 / ET47, 3mm out front and level with the factory rear. One owner ran it on Hoosier R7 track tires. Like every 19-inch setup on the GT3, plan on the rear control-arm bolt swap described in the platform notes.
Stanceflush → poke
OEM
Aggressive
RWD onlyDaily
Front Wheels
20×9 ET47
Rear Wheels
20×12 ET47
Documented buildLip position vs. stock · F 9J ET55 · R 12J ET47
ET47 / ET47
Stock height991.1 GT3 (two cars) and 991.2 GT3 · customer cars in a vendor gallery · factory 245/35R20 / 305/30R20 sizes on Michelin Pilot Sport Cup 2 or Yokohama AD09 · listed as fitting with no changes over steel or ceramic brakes · a vendor fitment guide lists the same setup
Front8mm outRear0mm out
Sources
Well-documented
3 community
1 vendor
The factory sizes with the front moved out: 20×9 ET47 with the stock 12-inch ET47 rear, 8mm out front and level at the rear, on the factory tire sizes. Three cars run it with no changes listed, and it clears the ceramic brakes. It's the setup for owners who want the stock rear position with a fuller front.
Stanceflush → poke
OEM
Aggressive
RWD onlyDaily
Front Wheels
20×9.5 ET50
Rear Wheels
21×12.5 ET48
Documented buildLip position vs. stock · F 9J ET55 · R 20″ 12J ET47
ET50 / ET48
991.2 GT3, 991.2 GT3 Touring and 991 Speedster · owner build and customer cars shown in vendor forum posts · GT3 RS factory sizes · 265/30R20 / 325/25R21 on the Touring, which the vendor says was very low · Michelin Pilot Sport 4S on the GT3 · no rubbing reported
Front11mm outRear5mm out
Sources
Documented
3 community
The 991 GT3 RS factory sizes on a GT3: 20×9.5 ET50 with a 21×12.5 ET48 rear, 11mm out front and 5mm at the rear. Three cars run it, including one Speedster. Porsche doesn't list these sizes for the GT3, so check the tire sizes against your owner's manual; 325/25R21 keeps the rear close to the factory diameter.
Stanceflush → poke
OEM
Aggressive
RWD onlyTrack
Front Wheels
19×10 ET42
Rear Wheels
19×12 ET46
Documented buildLip position vs. stock · F 20″ 9J ET55 · R 20″ 12J ET47
ET42 / ET46
991 GT3 · vendor fitment guide, track setup · 265/35R19 / 325/30R19 · front camber plates set to maximum negative camber and the rear control-arm bolt swap required
Front26mm outRear1mm out
Sources
Documented
1 vendor
The most aggressive documented setup: a 10-inch front at ET42, 26mm out of the factory front, with the 19×12 ET46 rear. It comes from a vendor's track listing rather than an owner build, and it needs front camber plates at full negative camber plus the rear bolt swap. Treat it as a dedicated track setup.
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Built to the exact spec, not the closest one on a shelf. The setups above come from real 991 GT3 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 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, GT3 Touring, 911 R or Speedster: 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 991 GT3 (2014–2016 991.1 and 2018–2019 991.2), the 2018–2019 GT3 Touring, the 2016 911 R and the 2019 Speedster. There was no 2017 GT3 in the US. In the VIN, the 10th character is E to G for 2014–2016 and J or K for 2018–2019. The GT3 RS and GT2 RS have their own guide.
What are the factory wheel specs on the 991 GT3, 911 R and Speedster?
Every one runs forged 20-inch centerlock wheels: 9J ET55 front on a 245/35ZR20 tire and 12J ET47 rear on a 305/30ZR20, across both the 991.1 and 991.2 GT3. The wheel designs differ between models, but the size doesn't, so every setup on this page applies to all of them.
What hub and hardware does the 991 GT3 use?
Every car in this guide 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 991 GT3 at stock ride height?
The documented 20-inch setup is 20×9 ET47 with a 20×12 ET47 rear on the factory tire sizes. Three cars in a vendor gallery run it with no changes listed, and a vendor fitment guide lists the same setup over steel or ceramic brakes. It moves the front 8mm out and keeps the factory rear position.
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 9J ET55 / 12J ET47 wheel. The stance dots place each setup within the range documented on the 991 GT3, from the mild end to the aggressive end.
What wheel sizes clear the 991 GT3 brakes?
The GT3's 380mm steel brakes clear the documented 19-inch wheels. A vendor lists the 410mm front ceramic brakes (PCCB), optional on the GT3 and standard on the 911 R and Speedster, as needing 20 inches; one owner reports 19s over PCCB. FMB's engineering check confirms caliper clearance for your brakes.
What do 19-inch wheels need on a 991 GT3?
Most documented 19-inch builds swap a rear lower control-arm bolt whose head sits close to the rear wheel barrel. Owners and a vendor use Porsche's 72mm pan-head bolt (999.073.530.01), and some turn the factory bolt around. Most run steel brakes and 265/35R19 / 325/30R19 track tires.
Why is there no square setup on the 991 GT3?
Every factory and documented 991 GT3 setup is staggered, with the rear 2 to 3 inches wider than the front, and we couldn't find a square setup with published offsets. The GT3 is 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?
No. The centerlock hub has no provision for spacers, and Porsche's certificates list none, so every offset on a GT3 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?
Porsche's winter set uses Turbo Sport II centerlock wheels, 9J ET51 front and 11J ET59 rear, on 245/35R20 / 295/30R20 tires, with snow chains listed for the rear. It sits 4mm further out at the front and 25mm further in at the rear than the summer wheels. FMB can build a winter set to the same sizes.
Will GT3 RS, Turbo or Carrera GTS wheels fit a 991 GT3?
The centerlock hub is shared, but sizes differ. GT3 RS wheels (9.5J ET50 / 12.5J×21 ET48) sit 11mm out front and 5mm at the rear, and owners run them. Turbo S and GTS centerlock wheels sit 4mm out front but 15–16mm in at the rear. The 991 Turbo guide and 991 Carrera 4 / GTS guide cover those cars.
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