Every 982 718 Boxster and Cayman uses a 5×130 bolt pattern, a 71.6mm center bore and M14×1.5 ball-seat lug bolts, with ET57 fronts on every factory wheel. Rears are 9.5J ET49 on 18s, 10J ET45 on 19s and 20s, and 10.5J ET47 on the GTS 4.0. This guide covers 2017–2025 base, S, T and GTS cars, rear shock clearance and documented 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.
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OEM Setups
Factory Wheel & Tire Configurations
Porsche's 982 certificate covers every non-GT Boxster and Cayman, and every factory front is ET57. The 19-inch S wheel and 20-inch Carrera S wheel (8J ET57 / 10J ET45) are the reference for every 19- and 20-inch "mm out" figure below; the 18-inch base wheel (8J ET57 / 9.5J ET49) is the reference on 18-inch cards.
Factory OffsetET57 front · ET49 (18″ 9.5J), ET45 (19″ / 20″ 10J) or ET47 (20″ 10.5J) rear
Brake SystemBase & T: 330mm front / 299mm rear · S & GTS 2.5: 330mm front with 911 Carrera calipers · GTS 4.0: 350mm six-piston front / 330mm rear · PCCB 350mm optional
18″ Boxster / 18″ Cayman
Standard — Boxster & Cayman
Front Wheel8J×18 ET57
Rear Wheel9.5J×18 ET49
Front Tire235/45ZR18
Rear Tire265/45ZR18
ConstructionAluminum Alloy
Part NumbersBoxster 982.601.025.M / .AL · Cayman 982.601.025.P / .Q
Applies To718 Boxster & 718 Cayman base (2017–2025)
The base cars' standard wheel and the reference for the 18-inch cards below. Porsche's certificate approves the 18-inch summer size on base models only, so S, T and GTS owners going to 18s are outside the factory list. The 18-inch winter set uses the same size and offsets.
19″ Boxster S / 19″ Cayman S
Standard — Boxster S & Cayman S
Front Wheel8J×19 ET57
Rear Wheel10J×19 ET45
Front Tire235/40ZR19
Rear Tire265/40ZR19
ConstructionAluminum Alloy
Part NumbersBoxster S 982.601.025 / .AM · Cayman S 982.601.025.B / .C
Applies To718 Boxster S & Cayman S (2017–2025) · optional on base cars
The S cars' standard wheel and the reference for every 19-inch "mm out" figure on this page. It shares its 8J ET57 / 10J ET45 sizes with the 20-inch Carrera S wheel, so the 19- and 20-inch cards read against the same lip position. Porsche doesn't approve it on the Style Edition.
20″ Carrera S and Carrera Classic II
Standard — 718 T & GTS 2.5
Front Wheel8J×20 ET57
Rear Wheel10J×20 ET45
Front Tire235/35ZR20
Rear Tire265/35ZR20
ConstructionAluminum Alloy
Part NumbersCarrera S 982.601.025.AJ / .AK or 982.601.029.AD / .AE · Classic II 981.362.160.14 / 982.601.025.S
Applies To718 T (2020–2025, Carrera S design in Titanium Grey) · GTS 2.5 (2018–2019) · optional on base and S
The 20-inch 8J / 10J size, standard on the T and the 2.5-liter GTS and the reference for the 20-inch cards. Porsche doesn't approve either design on the Style Edition or 25 Years cars, or the Classic II on the GTS 4.0.
20″ 982 GTS Wheel
Standard — GTS 4.0
Front Wheel8.5J×20 ET57
Rear Wheel10.5J×20 ET47
Front Tire235/35ZR20
Rear Tire265/35ZR20
ConstructionAluminum Alloy
Part NumbersFront 982.601.025.T or .AS · Rear 982.601.025.AH or .AT
The GTS 4.0's standard satin-black wheel, a half-inch wider at each end on the same ET57 front. Against the 20-inch Carrera S reference it sits about 6mm out front and 4mm at the rear, so subtract those from the figures below to compare a GTS 4.0 with its own stock wheels.
20″ Optional Wheels (8.5J / 10.5J) — Carrera Sport, 911 Turbo, 25 Years, Edition
Optional — all 982 models
Front Wheel8.5J×20 ET57
Rear Wheel10.5J×20 ET47
Front Tire235/35ZR20
Rear Tire265/35ZR20
ConstructionAluminum Alloy
Part NumbersCarrera Sport .K / .AG · 911 Turbo .F / .AF · 25 Years .AD or .AQ / .AE or .AR · Edition .AN / .AP (982.601.025.)
Applies ToAll 982 Boxster & Cayman (2017–2025) · 25 Years design standard on the Boxster 25 Years (2021)
Four 20-inch designs share the GTS 4.0 wheel's 8.5J ET57 / 10.5J ET47 sizes and sit where it does. Porsche's certificate lists these, not the 8J / 10J wheels, for the Style Edition and 25 Years cars. Check every stamp on a used set, since 911 versions of some designs use other offsets.
18″ and 19″ Porsche Winter Wheels
Winter — Boxster & Cayman
Front Wheel8J×18 ET57 or 8J×19 ET57
Rear Wheel9.5J×18 ET49 or 10J×19 ET45
Front Tire235/45R18 or 235/40R19
Rear Tire265/45R18 or 265/40R19
ConstructionAluminum Alloy
Applies ToBoxster & Cayman base, S, T & GTS (2017–2025)
Porsche's winter sets use the 18-inch base and 19-inch S sizes, and rear snow chains are listed for the 265/45R18 tire. The figures on this page read against the same sizes, so a winter set on these specs sits at stock lip position.
Aftermarket Options
Aftermarket Wheel & Tire Configurations
Every card below is one wheel size, and every row is one documented build at its effective offset. Base, S, T and GTS cars share the body and every factory front is ET57, so builds from any trim apply 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.
Some 981 and 718 trims and options use a rear shock with a wider lower body that cuts inner barrel room. On those cars a vendor lists 19×11 ET48 as not recommended (use 19×10.5 ET44), a 5mm spacer for 18×10.5 ET44 and a 7mm spacer for 20×11 ET50. Check your rear shock before ordering an 11-inch rear.
Brakes and 18-inch wheels.
Porsche approves 18-inch summer wheels on base cars only. S and GTS 2.5 cars use 911 Carrera front calipers on 330mm discs, the GTS 4.0 350mm six-piston fronts, and ceramic brakes (PCCB, 350mm) are optional; 18-inch builds are documented on S, T and GTS cars, but none on this page lists PCCB. Our engineering check confirms caliper clearance.
Lug bolts and seat type.
Every 982 uses M14×1.5 ball-seat lug bolts at 160 Nm. FMB machines 982 Boxster and Cayman 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
Stanceflush → poke
OEM
Aggressive
RWD onlyDaily
Front Wheels
19×9 ET50
Rear Wheels
19×10.5 ET44
Documented buildLip position vs. stock · F 19″ 8J ET57 · R 19″ 10J ET45
ET50 / ET44
Stock heightCayman base, Cayman S, Cayman GTS 2.5 and Cayman GTS 4.0 (six cars) · customer cars in a vendor gallery · 255/35R19 with 285/35R19 or 295/30R19 on Bridgestone Potenza RE-71RS, Michelin Pilot Sport 4S, Yokohama Advan Neova AD09 and Continental ExtremeContact Sport; one GTS 4.0 on 245/40R19 / 275/35R19 · the GTS 2.5 is listed as needing no changes · a vendor fitment guide lists this as the most popular size on the chassis
Front20mm outRear7mm out
Sources
Well-documented
6 community
1 vendor
The most documented 982 size and the vendor's most popular one: a 9-inch front and 10.5-inch rear, about 20mm out front and 7mm at the rear of the 19-inch S wheel. Six Caymans from base to GTS 4.0 run it at ET50 / ET44, most on 255 fronts with 285 or 295 rears.
Stanceflush → poke
OEM
Aggressive
RWD onlyDaily
Front Wheels
20×9 ET50
Rear Wheels
20×11 ET50
Documented buildLip position vs. stock · F 20″ 8J ET57 · R 20″ 10J ET45
ET50 / ET50
Stock heightCayman S, Cayman T, Cayman GTS 2.5, Cayman GTS 4.0 and Boxster GTS 4.0 (five cars) · customer cars in a vendor gallery · 245/35R20 / 295/30R20 Michelin Pilot Sport 4S, Pilot Sport Cup 2 or Continental ExtremeContact Sport; the GTS 2.5 on 245/35R20 / 285/30R20 Yokohama Advan A052 · three listed as needing no changes · a vendor fitment guide notes the rear depends on the rear shock type
Front20mm outRear8mm out
Sources
Well-documented
5 community
1 vendor
The 20-inch size with an 11-inch rear like the GT4's: a 9-inch front and 11-inch rear, about 20mm out front and 8mm at the rear of the 20-inch Carrera S wheel. Five cars run ET50 / ET50, three of them listed as needing no changes, most on 245/295 tires. Check your rear shock before ordering the 11-inch rear (see the alert above).
Stanceflush → poke
OEM
Aggressive
RWD onlyDaily
Front Wheels
20×9 ET50
Rear Wheels
20×10.5 ET44
Documented buildLip position vs. stock · F 20″ 8J ET57 · R 20″ 10J ET45
ET50 / ET44
Boxster and Cayman base, S, T, GTS and GTS 4.0 · vendor fitment guide, OEM+ fitment · 235/35R20 / 265/35R20 · the vendor lists it as the 20-inch alternative for cars whose rear shock limits an 11-inch rear, and notes the factory front strut mount may need adjusting for more negative camber
Front20mm outRear7mm out
Sources
Documented
1 vendor
The 20-inch choice for cars with the wider rear shock body: the same 9-inch ET50 front as the 20×11 card with a 10.5-inch ET44 rear, about 7mm out at the rear of the 20-inch Carrera S wheel. It's a vendor-listed setup on the factory 235/265 tire sizes; we couldn't find an owner build at this exact size.
Stance rangeflush → poke
OEM
Aggressive
RWD onlyTrack
Front Wheels
19×9
Documented ET50
Rear Wheels
19×11
Documented ET45 – ET48
Documented offsetsLip position vs. stock · F 19″ 8J ET57 · R 19″ 10J ET45
ET50 / ET48
Boxster and Cayman base, S, T, GTS and GTS 4.0 · vendor fitment guide, hardcore track fitment · 265/35R19 / 295/35R19, also listed with an ET48 front · rear toe links and front camber plates required · not recommended on cars with the wider rear shock body
Front20mm outRear10mm out
ET50 / ET46
Cayman GTS 2.5 · customer car in a vendor gallery · 265/35R19 / 305/30R19 Michelin Pilot Sport 4S · front camber plates for at least -2.5°, at least -2° rear and aftermarket rear toe links · listed as a hardcore track build whose rear may slightly poke
Front20mm outRear12mm out
ET50 / ET45
Stock heightCayman S (two cars), Cayman GTS 2.5 (two cars) and Boxster GTS 4.0 · customer cars in a vendor gallery · 255/35R19 / 305/30R19 Bridgestone Potenza RE-71R, Michelin Pilot Sport 4S or track tires · both GTS 2.5 cars listed as needing no changes; a Cayman S and the Boxster GTS 4.0 needed aftermarket rear toe links, and one Cayman S runs coilovers with -3° / -2.5° camber
Front20mm outRear13mm out
Sources
Well-documented
6 community
1 vendor
The 982 track size: an 11-inch rear for a 305 tire on a 9-inch ET50 front, 10–13mm out at the rear. Two GTS 2.5 cars run ET50 / ET45 with no changes listed; most track builds add rear toe links or camber. If your car is at stock height, start from the bottom row, and check your rear shock first.
Stance rangeflush → poke
OEM
Aggressive
RWD onlyDaily
Front Wheels
18×8.5
Documented ET42 – ET45
Rear Wheels
18×10
Documented ET31 – ET36
Documented offsetsLip position vs. stock · F 18″ 8J ET57 · R 18″ 9.5J ET49
ET45 / ET31
Lowered 40mmVia spacersCayman base · customer car in a vendor gallery · 245/40R18 / 275/40R18 Yokohama Advan Neova AD09 · Eibach lowering springs, about 40mm lower · originally documented as a rear ET36 with a 5mm spacer
Front18mm outRear24mm out
ET42 / ET36
Stock heightCayman base · customer car in a vendor gallery · 235/45R18 / 265/45R18 Pirelli P Zero, the factory 18-inch tire sizes · listed as an OEM+ setup needing no changes
Front21mm outRear19mm out
Sources
Documented
2 community
An 18-inch OEM+ size for base cars on the factory 235/265 tires: an 8.5-inch front and 10-inch rear, about 18–21mm out front and 19–24mm at the rear of the 18-inch base wheel. Both rows are base Caymans; one runs the factory tire sizes with no changes, the other is lowered on wider 245/275 tires.
Stanceflush → poke
OEM
Aggressive
RWD onlyTrack
Front Wheels
18×9 ET46
Rear Wheels
18×10.5 ET44
Documented buildLip position vs. stock · F 18″ 8J ET57 · R 18″ 9.5J ET49
ET46 / ET44
Stock heightCayman T, Cayman GTS 2.5 and Cayman GTS 4.0 · customer cars in a vendor gallery · 245/40R18 / 275/40R18 or 255/35R18 / 275/35R18 on Falken Azenis RT660, Nankang CR-S and Yokohama Advan A052 · the GTS 4.0 is listed as needing no changes; the T needed front camber plates for its 255 fronts · a vendor fitment guide lists this size for street and track, with a 5mm rear spacer on cars with the wider rear shock body
Front24mm outRear18mm out
Sources
Well-documented
3 community
1 vendor
The 18-inch track size for a 275 rear tire: a 9-inch ET46 front and 10.5-inch ET44 rear, about 24mm out front and 18mm at the rear of the 18-inch base wheel. Three Caymans from T to GTS 4.0 run it on track tires. On the wider rear shock, the vendor's 5mm spacer would mean an ET39 rear.
Stanceflush → poke
OEM
Aggressive
RWD onlyTrack
Front Wheels
18×9 ET46
Rear Wheels
18×10 ET36
Documented buildLip position vs. stock · F 18″ 8J ET57 · R 18″ 9.5J ET49
ET46 / ET36
Cayman S (four cars) · customer cars in a vendor gallery · 245/40R18 / 275/40R18 Yokohama Advan Neova AD09 on one car, Nitto NT01 track tires on the others · two run coilovers with -3° / -2.5° camber and one -2.5° camber with aftermarket brake rotors · a vendor fitment guide lists it as an OEM+ size and as the rear for cars with the wider rear shock body
Front24mm outRear19mm out
Sources
Well-documented
4 community
1 vendor
The 18-inch track size with a 10-inch rear: a 9-inch ET46 front and 10-inch ET36 rear, about 24mm out front and 19mm at the rear of the 18-inch base wheel. Four Cayman S track cars run it, mostly with added camber. The vendor lists the ET36 rear as the 18-inch fit for cars with the wider rear shock.
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Built to the exact spec, not the closest one on a shelf. The setups above come from real 718 Boxster and Cayman 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 Boxster and Cayman 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 Boxster or Cayman: 5×130 bolt pattern, bored to the 71.6mm hub, 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 Boxster and Cayman?
Every factory front is ET57. Base cars run 18-inch 8J / 9.5J ET49 rears on 235/45ZR18 / 265/45ZR18; S cars 19-inch 8J / 10J ET45 on 235/40ZR19 / 265/40ZR19; the T and GTS 2.5 20-inch 8J / 10J ET45; and the GTS 4.0 20-inch 8.5J / 10.5J ET47. Every 20-inch wheel runs 235/35ZR20 / 265/35ZR20.
What are the hub and lug bolt specs?
Every 982 Boxster and Cayman uses a 5×130 bolt pattern, a 71.6mm center bore and M14×1.5 ball-seat lug bolts torqued to 118 lb-ft (160 Nm). FMB machines 982 wheels for 60° conical-seat bolts by default. 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 on the 718 at stock ride height?
The most documented setup is 19×9 ET50 with a 19×10.5 ET44 rear, run by six Caymans from base to GTS 4.0 and listed by a vendor as the chassis's most popular size. On 20s, 20×9 ET50 / 20×11 ET50 on 245/35R20 / 295/30R20 is documented on five cars, three listed as needing no changes.
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 wheel named on the card. The 982's 8-inch fronts mean every 9-inch front sits about 18–24mm out, so the stance dots rate each setup against other 982 builds.
What wheel sizes clear the 718 brakes?
Base and T cars use 330mm front and 299mm rear discs, S and GTS 2.5 cars 911 Carrera front calipers on 330mm discs, and the GTS 4.0 350mm six-piston fronts with 330mm rears; ceramic brakes (PCCB, 350mm) are optional. Porsche approves 18-inch summer wheels on base cars only, though 18-inch sets are documented on S, T and GTS cars.
Why is there no square setup on the 718?
Every factory and documented 982 setup is staggered, with a wider rear for the mid-engine weight bias, and we couldn't find a square setup with published offsets. Every non-GT 982 is rear-wheel drive, so there's no all-wheel-drive rolling diameter concern; we document tire sizes on every card so you can compare them with the factory sizes.
Do wider rear wheels clear the 718 rear shock?
It depends on the shock. Some 981 and 718 trims and options use a rear shock with a wider lower body, and a vendor lists 10.5-inch rears (ET44) instead of 11-inch rears on those cars. Five 20×11 ET50 builds include GTS 2.5, T and GTS 4.0 cars, so check which shock your car has before ordering.
Can I use wheel spacers on the 718?
Porsche's 982 certificate lists no spacers. A vendor lists a 5mm rear spacer for 18×10.5 ET44 and a 7mm spacer for 20×11 ET50 on cars with the wider rear shock body. Every spacer build on this page is listed at its effective offset, and FMB machines that offset into the wheel instead of using a spacer.
What are the factory winter wheel options?
Porsche's winter sets use the 18-inch 8J ET57 / 9.5J ET49 and 19-inch 8J ET57 / 10J ET45 sizes, on 235/45R18 / 265/45R18 or 235/40R19 / 265/40R19 tires. Rear snow chains are listed for the 265/45R18 tire. FMB can build a winter set to the same sizes and offsets if you want a second set.
Which model years and cars does this guide cover?
The 982 718 Boxster and Cayman in base, S, T, GTS 2.5, GTS 4.0, Style Edition and Boxster 25 Years trims, model years 2017–2025. The T arrived for 2020 and the GTS 4.0 for 2021. In the VIN, the 10th character runs from H (2017) to S (2025). The GT4, GT4 RS, Spyder and Spyder RS have their own guide.
Will GT4 or Spyder wheels fit a 718 Cayman or Boxster?
The hub, bore and bolts match, and the GT4's 8.5J ET61 / 11J ET50 wheels sit about 2mm out front and 8mm at the rear of the 20-inch Carrera S wheel. One GTS 4.0 owner reports about 5mm of rear clearance with GT4 offsets on 295 rears. The 718 GT4 / Spyder guide covers those cars.
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