Porsche 911 / Lamborghini Aventador Forged Wheels
Gloss Black 5 Y-Spoke
2015-2021 Porsche Cayman GTS Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Porsche Cayman GTS wheels? This page gives the 2015-2021 Porsche Cayman GTS bolt pattern (5x130), centre bore, factory rim size and the offset range for aftermarket and forged Porsche Cayman GTS rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 2015-2021 Porsche Cayman GTS uses a 5x130 bolt pattern with a 71.6 mm centre bore and M14x1.5 lug bolts. Factory wheels: F: 20x8.5J R: 20x10.5J. For aftermarket wheels, 20x8.5J ET52 front / 20x10.5J ET45 rear sits flush and 20x8.5J ET45 front / 20x10.5J ET39 rear is the most aggressive fit.
Forged wheels for the 2015-2021 Porsche Cayman GTS — drilled 5x130 with a 71.6 mm centre bore, built to the offset you choose. From $220 per wheel, made to order in about 25 days.
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Porsche Cayman GTS (2015-2021): 5x130 bolt pattern, 71.6mm center bore. Factory wheels: F: 20x8.5J R: 20x10.5J. Reference fitment ranges.
Bolt Pattern5x130
Wheel Bolt/NutM14x1.5 Bolt
Center Bore71.6mm
Wheel Load Rating650–750 kg/wheel (Standard Passenger Car segment reference)
Caliper TypeFixed 4-piston caliper, all four corners (OEM, Porsche)
Year2015-2021
CategoryRoadster
✓ Data check: the bolt pattern and center bore on this page match an independent fitment reference. Last reviewed September 18, 2026. How we verify
Built to order by ANKUSI — IATF 16949 & ISO 9001 certified forged wheel manufacturer, TÜV/SFI/VIA compliant. See our factory & certifications →
Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | F: 20x8.5J R: 20x10.5J |
| Flush Fitment | F 20x8.5J ET52 / R 20x10.5J ET45 |
| Maximum Aggressive | F 20x8.5J ET45 / R 20x10.5J ET39 |
Forged wheels for the Porsche Cayman GTSMachined to the 5x130 bolt pattern and 71.6 mm bore · 14–24 inch · offset calculated for your car · 3D drawing before production
How to Read Wheel Offset & Measurements
Use these two references before ordering: the left diagram shows where each spec (PCD, center bore, offset, width and diameter) is measured on the wheel; the right diagram shows how positive, zero and negative offset shift the wheel face relative to the hub centerline.
ANKUSI Engineering Expert Advice
Convertibles lose some of the structural rigidity a fixed roof provides, which means the suspension and wheels end up doing more of the work to keep the chassis composed. A forged wheel keeps unsprung mass down without sacrificing the strength margin the factory built in — useful on a platform that's already managing extra flex.
The Porsche Cayman GTS runs a 5x130 bolt pattern, 71.6mm center bore, and a F: 20x8.5J wheel from the factory. Our Flush Fitment reference is F 20x8.5J ET52 / R 20x10.5J ET45, which tucks the tire under the fender lip on a stock-height Porsche Cayman GTS. Our Maximum Aggressive reference is F 20x8.5J ET45 / R 20x10.5J ET39 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Porsche Cayman GTS OE Wheel Specs
The 2015-2021 Porsche Cayman GTS (Roadster) uses a 5x130 bolt pattern with a 71.6mm center bore. Factory wheels are F: 20x8.5J R: 20x10.5J.
Why the factory spec works for most owners:
- Balances ride comfort with everyday drivability
- A commonly used size for this vehicle class, supporting parts and tire availability
- Maintains clearance for the factory suspension and brake components
- Provides stable, predictable handling across normal driving conditions
ANKUSI builds these wheels — we are the forging factory, not a reseller. For the Porsche Cayman GTS (2015-2021) we drill the 5x130 pattern and cut the centre bore to 71.6mm on our own CNC line, so the wheel hub-centres on the car with no spacer rings, in whatever diameter, width and offset you specify.
Converting these ET figures to backspacing? Use the wheel offset and backspacing calculator.
The figures on this page are part of our open wheel fitment dataset — 10,093 vehicles, free to download, CC BY 4.0.
Flush Fitment
For a flush look, F 20x8.5J ET52 / R 20x10.5J ET45 is a commonly used starting point — clearance must be verified on a stock or mildly lowered Porsche Cayman GTS.
Maximum Aggressive Fitment
F 20x8.5J ET45 / R 20x10.5J ET39 is a more aggressive reference setup. Beyond this, expect rubbing under compression without fender rolling or camber correction.
5-Tier Configuration Options
A
Factory-Style
F 20x8.5J ET57 / R 20x10.5J ET45Recommended setup: F 20x8.5J ET57 / R 20x10.5J ET45 | Economy impact: Negligible | Best for: Daily commuting, family use
Appearance: 7/10 | Comfort: 9.5/10 | Install difficulty: ★☆☆☆☆
Estimated cost: $1,200-1,500 (wheels + tires + install)
B
Comfortable Upgrade
F 20x8.5J ET55 / R 20x10.5J ET45Recommended setup: F 20x8.5J ET55 / R 20x10.5J ET45 | Economy impact: -2 to -4% | Best for: Daily / street
Appearance: 8/10 | Comfort: 9/10 | Install difficulty: ★☆☆☆☆
Estimated cost: $1,950-2,550 (wheels + tires + install)
C
Balanced / Flush Fit
F 20x8.5J ET52 / R 20x10.5J ET45Recommended setup: F 20x8.5J ET52 / R 20x10.5J ET45 | Economy impact: -4 to -6% | Best for: Street
Appearance: 8.5/10 | Comfort: 8/10 | Install difficulty: ★★☆☆☆
Estimated cost: $2,600-3,400 (wheels + tires + install)
D
Aggressive
F 20x8.5J ET49 / R 20x10.5J ET42Recommended setup: F 20x8.5J ET49 / R 20x10.5J ET42 | Economy impact: -6 to -9% | Best for: Show / occasional track
Appearance: 9/10 | Comfort: 6.5/10 | Install difficulty: ★★★☆☆
Estimated cost: $3,900-5,000 (wheels + tires + install)
E
Max Aggressive
F 20x8.5J ET45 / R 20x10.5J ET39Recommended setup: F 20x8.5J ET45 / R 20x10.5J ET39 | Economy impact: -8 to -12% | Best for: Show only
Appearance: 9.5/10 | Comfort: 4/10 | Install difficulty: ★★★★☆
Estimated cost: $4,800-6,200+ (wheels + tires + install)
Performance Comparison Matrix
| Metric | Tier A | Tier B | Tier C | Tier D | Tier E |
|---|---|---|---|---|---|
| Wheel Spec | F 20x8.5J ET57 / R 20x10.5J ET45 | F 20x8.5J ET55 / R 20x10.5J ET45 | F 20x8.5J ET52 / R 20x10.5J ET45 | F 20x8.5J ET49 / R 20x10.5J ET42 | F 20x8.5J ET45 / R 20x10.5J ET39 |
| Economy Impact | Negligible | -2 to -4% | -4 to -6% | -6 to -9% | -8 to -12% |
| Appearance | 7/10 | 8/10 | 8.5/10 | 9/10 | 9.5/10 |
| Comfort | 9.5/10 | 9/10 | 8/10 | 6.5/10 | 4/10 |
| Install Difficulty | ★☆☆☆☆ | ★☆☆☆☆ | ★★☆☆☆ | ★★★☆☆ | ★★★★☆ |
| Cost Range | $1,200-1,500 | $1,950-2,550 | $2,600-3,400 | $3,900-5,000 | $4,800-6,200+ |
| Best For | Daily commuting, family use | Daily / street | Street | Show / occasional track | Show only |
Real-World Reference Cases
The examples below are compiled from typical ANKUSI customer configurations and are labeled as reference cases, not individually verified real-world builds.
Case 1: Daily Driver (Factory-Style)
Profile: Everyday driving, prioritizes comfort and low running cost.
Setup: F 20x8.5J ET57 / R 20x10.5J ET45
Cost: ~$620
Outcome: Minimal visual change, ride and fuel economy essentially unaffected.
Case 2: Balanced Enthusiast (Balanced / Flush Fit)
Profile: Wants a sportier stance without sacrificing daily usability.
Setup: F 20x8.5J ET52 / R 20x10.5J ET45
Cost: ~$3,000
Outcome: Noticeable visual upgrade, fuel economy drop within the expected range.
Case 3: Show Build (Max Aggressive)
Profile: Built primarily for shows or occasional track/show use.
Setup: F 20x8.5J ET45 / R 20x10.5J ET39
Cost: ~$5,500
Outcome: Maximum visual impact; daily comfort and fuel economy are heavily compromised, physical test fit required before production.
Decision Guide
1
What's your primary use? Daily commuting → Tier A/B. Weekend street driving → Tier B/C. Show or occasional track use → Tier D/E.
2
What's your budget? Under $800 → Tier A. $800-3,400 → Tier B/C. $3,400+ → Tier D/E.
3
How much does fuel economy matter? Very important → Tier A. Somewhat important → Tier B/C. Not a priority → Tier D/E.
4
Still unsure? Tier C (Balanced / Flush Fit) is the default choice for most Porsche Cayman GTS owners.
Offset & Backspacing Reference
Backspacing is calculated as wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance):
- OE: F 20x8.5J ET57 → ~6.99″ F backspacing, R 20x10.5J ET45 → ~7.52″ R backspacing
- Flush: F 20x8.5J ET52 → ~6.8″ F backspacing, R 20x10.5J ET45 → ~7.52″ R backspacing
- Max: F 20x8.5J ET45 → ~6.52″ F backspacing, R 20x10.5J ET39 → ~7.29″ R backspacing
A Note on Clearance
Final clearance depends on the exact tire model, suspension height, brake package, alignment and vehicle tolerances. A physical test fit is recommended before production.
Want to check a different width or offset before you order? Use our Offset & Backspacing Calculator to solve the numbers yourself, or looking for your exact Porsche spec, or want a wheel built to a custom offset for your Porsche Cayman GTS? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.
Custom Forged Wheels for the Porsche Cayman GTS (2015-2021)
Everything above is reference data. If you want wheels actually built to it, that is what ANKUSI does: we are a forged wheel factory in Guangzhou, China, IATF 16949 and ISO 9001 certified, forging on our own 10,000-ton press and producing over 120,000 wheels a year. Forging blank, CNC machining, finishing, coating and inspection all happen in the same building — nothing is subcontracted and nothing is relabelled from another manufacturer.
Every set is cut to order, so the 5x130 pattern and the 71.6mm centre bore are machined for this car specifically rather than shimmed with adaptor rings. Diameter, width, offset, concavity, monoblock or multi-piece construction and the finish are all yours to choose.
Designs we already tool for the 5x130 pattern — each one is re-cut to your sizes and offsets:
Porsche 911 / BMW M3 Forged Wheels – Gloss White 5-Spoke
HRE 522M-Style Polished Silver 5-Spoke Directional Forged Wheels - Porsche Cayenne / Porsche 911 Fitment (5-Lug)
Porsche 911 / BMW M3 Forged Wheels – Mirror Polished 5-Spoke Deep-Lip (5-Lug)
HRE-Style Bronze 5 Y-Spoke Forged Wheels – Porsche 911 / M3 Fitment (5-Lug)Frequently Asked Questions
What bolt pattern (PCD) does the Porsche Cayman GTS use?
The 2015-2021 Porsche Cayman GTS uses a 5x130 bolt pattern.
How many lug bolts does the Porsche Cayman GTS use?
The Porsche Cayman GTS uses a 5-lug bolt pattern (5x130), so you need a 5-lug forged wheel to bolt straight on.
What is the center bore size on the Porsche Cayman GTS?
The Porsche Cayman GTS's center bore is 71.6mm. If an aftermarket wheel has a larger center bore than this, hub-centric rings are recommended so the wheel centers on the hub itself rather than relying on the lug bolts alone.
What size are the factory (stock) wheels on the Porsche Cayman GTS?
Factory wheels on the Porsche Cayman GTS are F: 20x8.5J R: 20x10.5J.
What is the biggest wheel size I can fit on my Porsche Cayman GTS without rubbing?
The most aggressive fitment we recommend without fender work is F 20x8.5J ET45 / R 20x10.5J ET39. Going beyond this typically causes rubbing under compression unless you roll the fenders or add camber correction.
What does a flush wheel fitment look like on the Porsche Cayman GTS?
For a flush look with minimal to no rubbing, we recommend F 20x8.5J ET52 / R 20x10.5J ET45 as a starting point on a stock or mildly lowered Porsche Cayman GTS.
Do I need wheel spacers for my Porsche Cayman GTS?
No. ANKUSI forges each wheel to your exact target offset, including the flush or max specs above, so you get the correct fitment without stacking spacers. Spacers are typically only used to push out an existing OE-offset wheel without replacing it, which isn't necessary when you're ordering a custom-offset forged wheel.
How do I calculate wheel backspacing for my Porsche Cayman GTS?
Backspacing (in inches) = wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance). For example, the flush spec above works out to roughly 6.8" backspacing up front and 7.52" in the rear.
What's the difference between wheel offset and backspacing?
Offset is the distance in millimeters from the wheel's true centerline to its mounting face (positive offset pulls the wheel in, negative pushes it out). Backspacing is the distance in inches from the mounting face to the back edge of the wheel barrel. They describe the same fitment from two different reference points, which is why ANKUSI lists both above — some shops and tuning guides quote offset, others quote backspacing.
Can I run staggered wheels (different sizes front and rear) on my Porsche Cayman GTS?
Yes — the Porsche Cayman GTS's factory and our recommended flush/max fitments already use staggered sizing (different width front and rear), and ANKUSI can forge matching staggered sets to your target offsets.
Vehicles With the Same Hub as the Porsche Cayman GTS (5x130, 71.6 mm Bore)
In our database, 294 other vehicle entries from 10 makes use exactly the same 5x130 bolt pattern and 71.6 mm center bore. Factory wheels from these cars bolt on and center on the hub without rings; offset and width still have to be checked.
5x130 is used by 5.8% of the vehicle pages in our English fitment guide (375 of 6,503); 78.7% of those also use a 71.6 mm center bore.
Hub-Centric Rings for a 71.6 mm Center Bore
A wheel with a center bore larger than 71.6 mm needs a hub-centric ring. The most common combinations:
| Wheel bore | Ring size |
|---|---|
| 72.6 mm | 72.6 → 71.6 mm |
| 73.1 mm | 73.1 → 71.6 mm |
| 74.1 mm | 74.1 → 71.6 mm |
| 76.1 mm | 76.1 → 71.6 mm |
ANKUSI forged wheels are bored to exactly 71.6 mm for this vehicle, so no ring is needed.
Sources and Last Update
Data checked against: avtoreference.com.
This record is part of the open ANKUSI Wheel Fitment Dataset (DOI 10.5281/zenodo.23241521, CC BY 4.0).
Other cars on the same factory size: 20x8.5 wheels · 20 inch wheels.
Compiled by the ANKUSI Wheels engineering team, an IATF 16949 and ISO 9001 certified forged wheel factory in Guangzhou.
Forged Wheel Designs for the Porsche Cayman GTS
Every design below is forged to order, so it can be machined to the Porsche Cayman GTS's 5x130 bolt pattern and 71.6 mm center bore, with the width and offset calculated for your setup.
Porsche 911 / BMW M3 G80 Forged Wheels
Gloss Black 5 Y-Spoke Concave
Porsche 911 / Panamera Forged Wheels
Silver 2-Piece Deep Lip
Porsche 911 / Cayenne Forged Wheels
Black / Polished
Porsche OEM-Style Brushed Silver 10-Spoke Forged Wheels
Porsche Cayenne / Macan Fitment · 5-Lug
Porsche 911 / M3 Forged Wheels
Gloss Black Full-Face · 5-Lug
Porsche 911 / BMW M3 Forged Wheels
Metallic Gray 5 W-Spoke
Rohana-Style Brushed Gold 10 Y-Spoke 2-Piece Gloss Black Lip Forged Wheels
Porsche 911 / BMW M3 Fitment · 5-Lug
Bolt pattern and center bore on this page were cross-checked against at least two independent sources before publication. Last reviewed 2026-09-18. Spotted an error? Email info@ankusi.com and we will verify and correct it.