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1993 Porsche 964 Speedster Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Porsche 964 Speedster wheels? This page gives the 1993 Porsche 964 Speedster bolt pattern (5x130), centre bore, factory rim size and the offset range for aftermarket and forged Porsche 964 Speedster rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 1993 Porsche 964 Speedster uses a 5x130 bolt pattern with a 71.6 mm centre bore and M14x1.5 lug bolts. Factory wheels: F: 17x7J R: 17x9J. For aftermarket wheels, 17x8J ET47 front / 17x9J ET47 rear sits flush and 18x8.5J ET52 front / 18x10J ET30 rear is the most aggressive fit.
Forged wheels for the 1993 Porsche 964 Speedster — 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 964 Speedster (1993): 5x130 bolt pattern, 71.6mm center bore. Factory wheels: F: 17x7J R: 17x9J. Reference fitment ranges.
Bolt Pattern5x130
Wheel Bolt/NutM14x1.5 Bolt
Center Bore71.6mm
Wheel Load Rating650–750 kg/wheel (Standard Passenger Car segment reference)
Year1993
CategoryRoadster
Data check: the bolt pattern and center bore on this page have not yet been confirmed by a second independent source. Measure your hub or ask us before ordering. How we verify
Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | F: 17x7J R: 17x9J |
| Flush Fitment | F 17x8J ET47 / R 17x9J ET47 |
| Maximum Aggressive | F 18x8.5J ET52 / R 18x10J ET30 |
Forged Wheel Designs for the Porsche 964 Speedster
Every design below is forged to order, so it can be machined to the Porsche 964 Speedster'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
With less structural stiffness from the missing roof, a convertible's suspension tuning leans more heavily on unsprung mass control. Forged construction keeps wheel weight down at the same strength rating, which is one less variable working against the Porsche 964 Speedster's chassis.
The Porsche 964 Speedster runs a 5x130 bolt pattern, 71.6mm center bore, and a F: 17x7J wheel from the factory. Our Flush Fitment reference is F 17x8J ET47 / R 17x9J ET47, which tucks the tire under the fender lip on a stock-height Porsche 964 Speedster. Our Maximum Aggressive reference is F 18x8.5J ET52 / R 18x10J ET30 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Porsche 964 Speedster OE Wheel Specs
The 1993 Porsche 964 Speedster (Roadster) uses a 5x130 bolt pattern with a 71.6mm center bore. Factory wheels are F: 17x7J R: 17x9J.
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 964 Speedster (1993) 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
964 Speedster runs Cup/Design 90 wheels or APEX ARC-8/Fuchs; 18in upgrade common 5x130 / 71.6 CB; verified against 964 fitment (Wheel-Size/Pelican 964 threads) F 17x7J ET55 / R 17x9J ET55 Cup design (5x130, 71.6 CB)
Offset & Backspacing Reference
Backspacing is calculated as wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance):
- OE: F 17x7J ET55 → ~6.17″ F backspacing, R 17x9J ET55 → ~7.17″ R backspacing
- Flush: F 17x8J ET47 → ~6.35″ F backspacing, R 17x9J ET47 → ~6.85″ R backspacing
- Max: F 18x8.5J ET52 → ~6.8″ F backspacing, R 18x10J ET30 → ~6.68″ 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 964 Speedster? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.
Vehicles With the Same Hub as the Porsche 964 Speedster (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.
Frequently Asked Questions
What bolt pattern (PCD) does the Porsche 964 Speedster use?
The 1993 Porsche 964 Speedster uses a 5x130 bolt pattern.
How many lug bolts does the Porsche 964 Speedster use?
The Porsche 964 Speedster 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 964 Speedster?
The Porsche 964 Speedster'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 964 Speedster?
Factory wheels on the Porsche 964 Speedster are F: 17x7J R: 17x9J.
What is the biggest wheel size I can fit on my Porsche 964 Speedster without rubbing?
The most aggressive fitment we recommend without fender work is F 18x8.5J ET52 / R 18x10J ET30. 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 964 Speedster?
For a flush look with minimal to no rubbing, we recommend F 17x8J ET47 / R 17x9J ET47 as a starting point on a stock or mildly lowered Porsche 964 Speedster.
Do I need wheel spacers for my Porsche 964 Speedster?
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 964 Speedster?
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 6.35" backspacing up front and 6.85" 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 964 Speedster?
Yes — the Porsche 964 Speedster'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, tirewheelguide.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: 17x7 wheels · 17 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 come from published fitment references and are still awaiting a second independent check. Last reviewed 2026-09-18. Spotted an error? Email info@ankusi.com and we will verify and correct it.