The 718 Cayman GT4 and 718 Spyder use a 5×130 bolt pattern, 71.6mm center bore and M14×1.5 ball-seat lug bolts; the GT4 RS and Spyder RS use centerlock hubs. All four share one factory size, 20×8.5 ET61 front and 20×11 ET50 rear. This guide covers the 2020–2025 cars, brake limits on smaller wheels and documented aftermarket 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 certificate. Use it as research for your build; ride height, tires, and alignment are your installer's call.
Pricing forged wheels for your 718 Spyder or GT4? Full sets from $3,900 in 20″.See your exact price →
OEM Setups
Factory Wheel & Tire Configurations
All four cars share the hardware below, listed by hub. Porsche approves only 20-inch wheels for them: 8.5J ET61 front and 11J ET50 rear, on 5-lug wheels for the GT4 and Spyder and centerlock wheels for the RS models. That factory wheel is the reference for every "mm out" figure below.
The standard wheel on the 4.0-liter GT4 and Spyder, in silver on the Spyder and Satin Platinum on the GT4 at launch. Porsche's certificate lists this as the only approved summer size, and Porsche Tequipment's lightweight forged GT4 wheel uses the same size and offset. It's the reference for every ladder below.
The RS models keep the GT4's size and offsets exactly but switch to a forged centerlock wheel. Front and rear lips sit where the 5-lug wheel's do, so offset figures carry over between the two hubs, though the wheels themselves don't swap. Some 2024 RS cars are part of Porsche's center-lock recall.
Applies ToCayman GT4 RS & Spyder RS with the Weissach Package · centerlock
The lightest factory option, a forged magnesium centerlock wheel offered with the Weissach Package on both RS models. It's the same size and offset as the standard RS wheel, so it sits in the same place on the car and every row below reads the same against it.
Porsche's winter set for these cars uses narrower 8J and 10J wheels on 235/35R20 and 275/30R20 tires, with a centerlock version for the RS models. By the lip formula the front sits about 2mm inside the summer wheel and the rear about 8mm inside. Porsche approves snow chains on the rear axle only.
Aftermarket Options
Aftermarket Wheel & Tire Configurations
Every card below is one wheel size, and every row is one documented build at its effective offset; none of these builds use spacers. Rows are labeled by car and hub, since GT4 and Spyder builds are 5-lug and RS builds are centerlock, with identical factory offsets. 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 GT4 and Spyder use five lug bolts; the GT4 RS and Spyder RS use centerlock hubs, with one central nut at 600 Nm and no spacer provision. The factory offsets match, but the wheels don't swap. Some 2024 GT4 RS and Spyder RS cars are part of Porsche's center-lock recall (NHTSA 24V809, expanded in 2026 as 26V682). Check your VIN with a dealer before changing wheels.
Brakes set the smallest wheel.
Vendor fitment documentation lists 20-inch wheels as the minimum with factory 410mm PCCB on all four cars and with the RS's 408mm steel front brake. The GT4 and Spyder's 380mm steel brakes clear documented 19-inch sets. 18-inch builds, and most 19-inch RS builds, changed the front brakes.
Ball-seat lug bolts.
On 5-lug cars the factory bolts have a ball seat. FMB machines 5-lug GT4 and Spyder wheels for 60° conical-seat bolts by default, so a new set runs conical bolts of the correct length. If you want to keep your factory ball-seat bolts, tell us when you order; otherwise the wheels are machined for conical. Most Porsche owners ask for ball seat.
Staggered Setup
Most Popular
Stance rangeflush → poke
OEM
Aggressive
RWD onlyDaily
Front Wheels
20×9
Documented ET50 – ET58
Rear Wheels
20×11
Documented ET48 – ET50
Documented offsetsLip position vs. stock · F 8.5J ET61 · R 11J ET50
ET58 / ET48
Cayman GT4 RS · centerlock · 265 front / 305 rear Hoosier track tires · owner build fitted and shown on the car
Front9mm outRear2mm out
ET55 / ET50
Cayman GT4 RS · centerlock · 265 front tire, which the owner calls a tight fit that works; normally runs a 245 · track wheels
Front12mm outRear0mm out
ET53 / ET50
Stock heightCayman GT4 RS (seven cars) and Spyder RS · centerlock · customer cars in a vendor gallery, mostly on 245/35R20 / 295/30R20; 255 and 265 fronts were run with camber plates · two listed as needing no changes, one lowered 0.25″ · a vendor fitment guide lists this setup for both RS models
Front14mm outRear0mm out
ET52 / ET50
Cayman GT4 RS · centerlock · 245/35R20 / 295/30R20 Michelin Pilot Sport Cup 2 · factory rear wheel · owner reports the front sits out noticeably until camber plates are fitted
Front15mm outRear0mm out
ET50 / ET50
Stock heightCayman GT4 and 718 Spyder (five cars) · 5-lug · customer cars in a vendor gallery on 245/35R20 / 295/30R20 · listed as needing no changes · a vendor fitment guide lists this setup and says it clears the 410mm PCCB
Front17mm outRear0mm out
Sources
Strongly documented
16 community
2 vendor
The most documented size on all four cars: a half-inch-wider front with the factory 20×11 rear. 5-lug GT4 and Spyder builds sit at ET50 and centerlock RS builds at ET53, both documented with no changes and with PCCB. The RS rows at ET55–58 tuck the wider front back in. At stock height, start from the ET50 (5-lug) or ET53 (centerlock) row.
Stance rangeflush → poke
OEM
Aggressive
RWD onlyTrack
Front Wheels
19×9
Documented ET50 – ET52
Rear Wheels
19×11
Documented ET45 – ET50
Documented offsetsLip position vs. stock · F 20″ 8.5J ET61 · R 20″ 11J ET50
ET52 / ET50
Cayman GT4 RS · centerlock · 255 front / 300 rear Hankook F200 slicks · rear camber plates · wheel designed around the factory front caliper · track car
Front15mm outRear0mm out
ET50 / ET48
Steel brakes onlyCayman GT4 (three cars) · 5-lug · customer cars in a vendor gallery on 255/35R19 to 265/35R19 fronts and 295/30R19 to 305/30R19 rears · motorsport-style rear toe links fitted to clear the rear barrel · a vendor fitment guide lists this setup
Front17mm outRear2mm out
ET50 / ET46
Stock heightSteel brakes onlyCayman GT4 (three cars) · 5-lug · customer cars in a vendor gallery on 255/35R19 / 285/35R19 Bridgestone Potenza RE-71R · listed as needing no changes, one on stock camber
Front17mm outRear4mm out
ET50 / ET45
Steel brakes onlyCayman GT4 (five cars) · 5-lug · customer cars in a vendor gallery on 255/35R19 to 265/35R19 fronts and 285/35R19 to 305/30R19 rears · rear toe links fitted, camber plates with 265 fronts; very wide tires may sit slightly past the rear fender · a vendor fitment guide lists this setup
Front17mm outRear5mm out
Sources
Strongly documented
12 community
2 vendor
A 19-inch track set with an 11-inch rear. Most 5-lug builds at ET45–48 fitted motorsport-style rear toe links to clear the smaller rear barrel; three ET46 cars were listed as needing no changes. Clearance depends on the wheel's barrel and spoke shape, so confirm it for your design. The centerlock row is a GT4 RS run on slicks.
Stanceflush → poke
OEM
Aggressive
RWD onlyTrack
Front Wheels
19×9 ET50
Rear Wheels
19×10.5 ET44
Documented buildLip position vs. stock · F 20″ 8.5J ET61 · R 20″ 11J ET50
ET50 / ET44
Stock heightSteel brakes onlyCayman GT4 (seven cars) · 5-lug · customer cars in a vendor gallery on 255/35R19 / 285/35R19 to 305/30R19, including three winter sets on 235/40R19 fronts · most listed as needing no changes; camber plates with 265 fronts · a vendor fitment guide lists this setup
Front17mm outRear0mm out
Sources
Well-documented
7 community
1 vendor
The 19-inch set that avoids the rear toe-link change: a 10.5-inch rear lands at the factory rear lip line, with the front 17mm out. It's documented at stock height on summer, track and winter tires. Factory 410mm PCCB cars need 20-inch wheels, according to vendor fitment documentation, so this size is for steel-brake GT4 and Spyder cars.
Stanceflush → poke
OEM
Aggressive
RWD onlyTrack
Front Wheels
18×9 ET46
Rear Wheels
18×10.5 ET44
Documented buildLip position vs. stock · F 20″ 8.5J ET61 · R 20″ 11J ET50
ET46 / ET44
Aftermarket front brakesCayman GT4 · 5-lug · customer car in a vendor gallery on 265/645-18 / 305/680-18 Pirelli slicks · aftermarket front brakes and camber plates · a vendor fitment guide lists this setup with 997.2 GT3 or aftermarket 380mm front brakes
Front21mm outRear0mm out
Sources
Documented
1 community
1 vendor
A Clubsport-style 18-inch setup for slick tires. The factory GT4 brakes won't clear an 18-inch barrel, so this build changed the front brakes; vendor documentation lists 997.2 GT3 front brakes or an aftermarket 380mm kit as working options. Camber plates come with the 265 front. It's a track-only setup.
Stance rangeflush → poke
OEM
Aggressive
RWD onlyTrack
Front Wheels
19×9.5
Documented ET48 – ET49
Rear Wheels
19×11
Documented ET48 – ET48
Documented offsetsLip position vs. stock · F 20″ 8.5J ET61 · R 20″ 11J ET50
ET49 / ET48
Aftermarket front brakesCayman GT4 RS (two cars) · centerlock · customer cars in a vendor gallery on 255/35R19 to 265/35R19 / 305/30R19 · aftermarket or 991 GT3 front brakes, camber plates and rear toe links · a vendor fitment guide lists this setup
Front25mm outRear2mm out
ET48 / ET48
Steel brakes onlyCayman GT4 / 718 Spyder · 5-lug · vendor fitment guide · listed with 265/35R19 / 295/30R19, front camber plates and rear toe links
Front26mm outRear2mm out
Sources
Well-documented
2 community
2 vendor
The widest documented front, about 25mm out. On the RS models this size means changing the front brakes, because the factory 408mm steel rotor needs a 20-inch wheel; both RS cars ran aftermarket or 991 GT3 front brakes. The 5-lug row is a vendor fitment-guide setup for steel-brake GT4 and Spyder cars. Both rows use rear toe links.
★★★★★
Was this guide helpful?
Let us know how we did on Google.
Your feedback helps other owners find these free fitment guides. It takes about 30 seconds.
Built to the exact spec, not the closest one on a shelf. The setups above come from real 718 GT4 / Spyder 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 718 GT4 / Spyder 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 718 GT4 or Spyder: made for your hub, either centerlock or 5×130 bored to the 71.6mm hub and machined for 60° conical lug bolts (or your factory ball-seat bolts if you request it when ordering), 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.
What are the factory wheel specs on the 718 GT4, Spyder, GT4 RS and Spyder RS?
All four run 20×8.5 ET61 front and 20×11 ET50 rear on 245/35ZR20 and 295/30ZR20 tires. The GT4 and Spyder use 5-lug wheels; the GT4 RS and Spyder RS use forged centerlock wheels, with forged magnesium offered in the Weissach Package. Porsche's approved-wheels certificate lists no 19-inch or 21-inch size for these cars.
What are the bolt pattern, center bore and lug bolt specs?
The GT4 and Spyder use a 5×130 bolt pattern and 71.6mm center bore, with M14×1.5 ball-seat lug bolts torqued to 160 Nm (118 lb-ft). RS models use a centerlock nut at 600 Nm (443 lb-ft). FMB machines 5-lug GT4 and Spyder wheels for 60° conical-seat bolts by default, so a new set runs conical bolts of the correct length. If you want to keep your factory ball-seat bolts, tell us when you order; otherwise the wheels are machined for conical.
What aftermarket wheel sizes are documented at stock ride height?
The most common is 20×9 / 20×11: ET50 / ET50 on 5-lug GT4 and Spyder cars and ET53 / ET50 on centerlock RS cars, both listed as needing no changes on factory-size tires. On steel-brake GT4s, 19×9 ET50 with a 19×10.5 ET44 rear is documented at stock height too.
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 effective offset. The Front and Rear figures show how far the outer lip sits outside the factory 8.5J ET61 / 11J ET50 wheel. Around 14–17mm at the front reads as the common flush step; the 19×9.5 builds at about 25mm are the aggressive end.
What is the smallest wheel that clears the brakes?
Vendor fitment documentation lists 20 inches as the minimum with factory 410mm PCCB on all four cars and with the RS's 408mm steel front rotor. GT4 and Spyder cars on 380mm steel brakes run documented 19-inch sets. Every 18-inch build, and most 19-inch RS builds, changed the front brakes. Clearance also depends on the wheel's spoke shape.
Do 19-inch rear wheels need different toe links?
Usually, with an 11-inch rear. Most documented 19×11 builds on the GT4 fitted motorsport-style rear toe links to clear the smaller barrel, and vendor fitment documentation lists them as required. A 19×10.5 rear at ET44 is documented without that change. Three 19×11 ET46 cars were listed as needing no changes, so check your wheel design.
Why is there no square setup for these cars?
Every factory setup is staggered, 8.5-inch front and 11-inch rear, and we couldn't find a documented square setup with published offsets. The front and rear factory offsets are also different, ET61 against ET50. All four cars are rear-wheel drive, so rolling diameter is about speedometer and gearing rather than an all-wheel-drive system.
Can I use wheel spacers on these cars?
Only on the 5-lug GT4 and Spyder; Porsche provides no spacers for the RS centerlock hub. None of the builds documented here use spacers. We list any spacer build at its effective offset, and FMB machines that offset into the wheel directly, so the spacer and longer bolts aren't needed on either hub.
What are the winter wheel options?
Porsche's winter set is 20×8 ET57 front and 20×10 ET45 rear on 235/35R20 and 275/30R20 winter tires, with a centerlock version for the RS models; chains are approved on the rear only. GT4 owners also document 19×9 ET50 / 19×10.5 ET44 winter sets on 235/40R19 fronts, for steel-brake cars only.
Do GT4 wheels fit a GT4 RS, or Spyder wheels fit a Spyder RS?
No. The sizes and offsets are identical, but the GT4 and Spyder use 5×130 lug wheels and the RS models use centerlock, so a wheel has to be made for one hub or the other. A GT4 wheel and a Spyder wheel do swap, as do RS wheels between the two RS models. The base 718 and GTS 4.0 use different wheels.
Which model years does this guide cover?
In the US, the 718 Cayman GT4 and 718 Spyder for model years 2020–2023, the Cayman GT4 RS for 2023–2025 and the Spyder RS for 2024–2025, when 718 production ended. The earlier 981 Cayman GT4 and Boxster Spyder, and the base, S and GTS 4.0 718 models, use different wheels and aren't covered here.
More Guides
Explore More Fitment Guides
Guides for other platforms, built the same way from OEM data and real owner builds.
