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2020 Porsche 718 Cayman GT4 Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Porsche 718 Cayman GT4 wheels? This page gives the 2020 Porsche 718 Cayman GT4 bolt pattern (5x130), centre bore, factory rim size and the offset range for aftermarket and forged Porsche 718 Cayman GT4 rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Porsche 718 Cayman GT4 (2020): 5x130 bolt pattern, 71.6mm center bore. Factory wheels: F: 20x8.5J R: 20x11J. Reference fitment ranges.
Bolt Pattern5x130
Wheel Bolt/NutM14x1.5 Bolt
Center Bore71.6mm
Wheel Load Rating700–850 kg/wheel (Performance / Sports Car segment reference)
Caliper TypeFixed 4-piston caliper, all four corners (OEM, Porsche)
Year2020
CategoryTrack Sports Car
✓ Data check: the bolt pattern and center bore on this page match an independent fitment reference. Last reviewed September 18, 2026. How we verify
Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | F: 20x8.5J R: 20x11J |
| Flush Fitment | F 20x9J ET50 / R 20x11J ET45 |
| Maximum Aggressive | F 20x9J ET50 / R 20x11J ET45 |
Forged Wheel Designs for the Porsche 718 Cayman GT4
Every design below is forged to order, so it can be machined to the Porsche 718 Cayman GT4's 5x130 bolt pattern and 71.6 mm center bore, with the width and offset calculated for your setup.
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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
On a track-focused car the factory already spent the unsprung-weight budget carefully, so the aftermarket brief is narrow: same footprint, less mass, more barrel clearance for the brake package. Chasing poke on a car like this usually costs lap time before it buys looks.
The Porsche 718 Cayman GT4 runs a 5x130 fitment, 71.6mm center bore, and a F: 20x8.5J wheel from the factory. Our Flush Fitment reference is F 20x9J ET50 / R 20x11J ET45, which tucks the tire under the fender lip on a stock-height Porsche 718 Cayman GT4. Our Maximum Aggressive reference is F 20x9J ET50 / R 20x11J ET45 - the verified data does not support going wider than the flush spec on this chassis.
Porsche 718 Cayman GT4 OE Wheel Specs
The 2020 Porsche 718 Cayman GT4 (Track Sports Car) uses a 5x130 bolt pattern with a 71.6mm center bore. Factory wheels are F: 20x8.5J R: 20x11J.
Why the factory spec works for most owners:
- Keeps unsprung weight low to preserve the factory handling balance
- Matches the wider, performance-oriented tire sizing typical of this platform
- Maintains clearance for the factory brake package and suspension geometry
- Balances grip with ride comfort for daily and spirited driving
ANKUSI builds these wheels — we are the forging factory, not a reseller. For the Porsche 718 Cayman GT4 (2020) 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.
Real-World Fitment Notes
APEX EC-7RS / SM-10RS / VS-5RS forged 20in are the documented track-and-street owner choice 5x130 / M14x1.5, CB71.6; staggered front/rear-specific offsets. Verified at 982 GT4/Spyder platform level (APEX / Rennlist / Wheel-Size).
Offset & Backspacing Reference
Backspacing is calculated as wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance):
- OE: F 20x8.5J ET61 → ~7.15″ F backspacing, R 20x11J ET50 → ~7.97″ R backspacing
- Flush: F 20x9J ET50 → ~6.97″ F backspacing, R 20x11J ET45 → ~7.77″ R backspacing
- Max: F 20x9J ET50 → ~6.97″ F backspacing, R 20x11J ET45 → ~7.77″ 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 718 Cayman GT4? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.
Frequently Asked Questions
What bolt pattern (PCD) does the Porsche 718 Cayman GT4 use?
The 2020 Porsche 718 Cayman GT4 uses a 5x130 bolt pattern.
How many lug bolts does the Porsche 718 Cayman GT4 use?
The Porsche 718 Cayman GT4 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 718 Cayman GT4?
The Porsche 718 Cayman GT4'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 718 Cayman GT4?
Factory wheels on the Porsche 718 Cayman GT4 are F: 20x8.5J R: 20x11J.
What is the biggest wheel size I can fit on my Porsche 718 Cayman GT4 without rubbing?
The most aggressive fitment we recommend without fender work is F 20x9J ET50 / R 20x11J ET45. 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 718 Cayman GT4?
For a flush look with minimal to no rubbing, we recommend F 20x9J ET50 / R 20x11J ET45 as a starting point on a stock or mildly lowered Porsche 718 Cayman GT4.
Do I need wheel spacers for my Porsche 718 Cayman GT4?
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 718 Cayman GT4?
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 6.97" backspacing up front and 7.77" 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 718 Cayman GT4?
Yes — the Porsche 718 Cayman GT4'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.