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2004 Porsche Boxster Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Porsche Boxster wheels? This page gives the 2004 Porsche Boxster bolt pattern (5x130), centre bore, factory rim size and the offset range for aftermarket and forged Porsche Boxster rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 2004 Porsche Boxster uses a 5x130 bolt pattern with a 71.6 mm centre bore and M14x1.5 lug bolts. Factory wheels: F: 16x6J R: 16x7J. For aftermarket wheels, 17x7J ET55 front / 17x8.5J ET47 rear sits flush and 18x8.5J ET50 front / 18x10J ET45 rear is the most aggressive fit.
Forged wheels for the 2004 Porsche Boxster — drilled 5x130 with a 71.6 mm centre bore, built to the offset you choose. From $220 per wheel, made to order in 20–25 days.
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Porsche Boxster (2004): 5x130 bolt pattern, 71.6mm center bore. Factory wheels: F: 16x6J R: 16x7J. 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)
Year2004
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: 16x6J R: 16x7J |
| Flush Fitment | F 17x7J ET55 / R 17x8.5J ET47 |
| Maximum Aggressive | F 18x8.5J ET50 / R 18x10J ET45 |
Forged Wheel Designs for the Porsche Boxster
Every design below is forged to order, so it can be machined to the Porsche Boxster'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
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 Boxster runs a 5x130 bolt pattern, 71.6mm center bore, and a F: 16x6J wheel from the factory. Our Flush Fitment reference is F 17x7J ET55 / R 17x8.5J ET47, which tucks the tire under the fender lip on a stock-height Porsche Boxster. Our Maximum Aggressive reference is F 18x8.5J ET50 / R 18x10J ET45 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Porsche Boxster OE Wheel Specs
The 2004 Porsche Boxster (Roadster) uses a 5x130 bolt pattern with a 71.6mm center bore. Factory wheels are F: 16x6J R: 16x7J.
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 Boxster (2004) 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 with minimal rubbing, F 17x7J ET55 / R 17x8.5J ET47 is the recommended starting point on a stock or mildly lowered Porsche Boxster.
Maximum Aggressive Fitment
F 18x8.5J ET50 / R 18x10J ET45 is a more aggressive reference setup. Beyond this, expect rubbing under compression without fender rolling or camber correction.
Real-World Fitment Notes
APEX SM-10 / forged 18s, 5x130 71.6 hub-centric 986 Boxster base; same-platform 987/986 APEX + Pelican verified F 16x6J ET50 / R 16x7J ET40, 5x130, CB71.6
Offset & Backspacing Reference
Backspacing is calculated as wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance):
- OE: F 16x6J ET50 → ~5.47″ F backspacing, R 16x7J ET40 → ~5.57″ R backspacing
- Flush: F 17x7J ET55 → ~6.17″ F backspacing, R 17x8.5J ET47 → ~6.6″ R backspacing
- Max: F 18x8.5J ET50 → ~6.72″ F backspacing, R 18x10J ET45 → ~7.27″ 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 Boxster? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.
Porsche Boxster: Specs by Model Year
| Year | Bolt pattern | Center bore | Factory wheel |
|---|---|---|---|
| 2001 | 5x130 | 71.6 mm | 16x6J |
| 2002 | 5x130 | 71.6 mm | 16x6J |
| 2003 | 5x130 | 71.6 mm | 16x6J |
| 2004 | 5x130 | 71.6 mm | 16x6J |
| 2005 | 5x130 | 71.6 mm | 17x6.5J |
| 2006 | 5x130 | 71.6 mm | 17x6.5J |
| 2007 | 5x130 | 71.6 mm | 17x6.5J |
| 2008 | 5x130 | 71.6 mm | 17x6.5J |
| 2009 | 5x130 | 71.6 mm | 17x7J |
| 2013 | 5x130 | 71.6 mm | 18x8J |
Bolt pattern and center bore stay the same across all 10 model years in our database (2001–2013).
Vehicles With the Same Hub as the Porsche Boxster (5x130, 71.6 mm Bore)
In our database, 288 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.
Frequently Asked Questions
What bolt pattern (PCD) does the Porsche Boxster use?
The 2004 Porsche Boxster uses a 5x130 bolt pattern.
How many lug bolts does the Porsche Boxster use?
The Porsche Boxster 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 Boxster?
The Porsche Boxster'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 Boxster?
Factory wheels on the Porsche Boxster are F: 16x6J R: 16x7J.
What is the biggest wheel size I can fit on my Porsche Boxster without rubbing?
The most aggressive fitment we recommend without fender work is F 18x8.5J ET50 / R 18x10J 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 Boxster?
For a flush look with minimal to no rubbing, we recommend F 17x7J ET55 / R 17x8.5J ET47 as a starting point on a stock or mildly lowered Porsche Boxster.
Do I need wheel spacers for my Porsche Boxster?
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 Boxster?
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 6.17" backspacing up front and 6.6" 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 Boxster?
Yes — the Porsche Boxster'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.
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: 16x6 wheels · 16 inch wheels.
Compiled by the ANKUSI Wheels engineering team, an IATF 16949 and ISO 9001 certified forged wheel factory in Guangzhou.
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.