1970 Porsche 914-4 Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Porsche 914-4 wheels? This page gives the 1970 Porsche 914-4 bolt pattern (4x130), centre bore, factory rim size and the offset range for aftermarket and forged Porsche 914-4 rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 1970 Porsche 914-4 uses a 4x130 bolt pattern and M12x1.5 lug nuts. Factory wheels: F: 15x5.5J R: 15x5.5J.
Forged wheels for the 1970 Porsche 914-4 — drilled 4x130, built to the offset you choose. From $220 per wheel, made to order in 20–25 days.
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Porsche 914-4 (1970): 4x130 bolt pattern, centre bore pending verification. Factory wheels: F: 15x5.5J R: 15x5.5J. Reference fitment ranges.
Bolt Pattern4x130
Wheel Bolt/NutM12x1.5 Nut
Center BorePending verification
Wheel Load Rating550–650 kg/wheel (Classic Sports Car segment reference)
Caliper TypeVented front disc brakes (OEM, Porsche 914)
Year1970
CategorySports Coupe
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 |
|---|---|
| Flush Fitment | F 15x7J ET23 / R 15x7J ET23 |
| Maximum Aggressive | F 15x8J ET16 / R 15x8J ET16 |
Forged Wheel Designs for the Porsche 914-4
Every design below is forged to order, so it can be machined to the Porsche 914-4's 4x130 bolt pattern, with the width and offset calculated for your setup.
BBS LM-Style Gunmetal Mesh Polished Deep Lip Forged Wheels
Deep Dish · Gunmetal
Rotiform-Style Gloss White 6-Spoke Forged Wheels
Monoblock · Gloss White
BBS-Style Gold Mesh Polished Lip Forged Wheels
Monoblock · Gold
BBS-Style Gold Mesh Polished Lip 2-Piece Forged Wheels
2-Piece · Gold
Bronze Gold Cross-Spoke Forged Wheels
Monoblock · Bronze Gold
OZ Racing-Style Gloss White 15-Spoke Forged Wheels
Monoblock · Gloss White
Rays-Style Gunmetal Mesh Polished Deep Lip Forged Wheels
Deep Dish · Gunmetal
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
Coupes and performance platforms are where rotational mass shows up fastest — in acceleration, in braking, and in how quickly the chassis changes direction. Forging lets us build to the same strength spec as the factory wheel at a meaningfully lower rotational weight, which is where the performance gain actually comes from, not just the visual one.
The Porsche 914-4 runs a 4x130 bolt pattern, centre bore pending verification, and a F: 15x5.5J wheel from the factory. Our Flush Fitment reference is F 15x7J ET23 / R 15x7J ET23, which tucks the tire under the fender lip on a stock-height Porsche 914-4. Our Maximum Aggressive reference is F 15x8J ET16 / R 15x8J ET16 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Porsche 914-4 OE Wheel Specs
Verification notice (2026-09-19): the centre bore previously listed for this vehicle (78.6 mm) could not be confirmed by two independent references, so it has been withdrawn until verified. The bolt pattern shown has been confirmed.
The 1970 Porsche 914-4 (Sports Coupe) uses a 4x130 bolt pattern with a, centre bore pending verification. Factory wheels are F: 15x5.5J R: 15x5.5J.
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 914-4 (1970) we drill the 4x130 pattern 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
The 914-4's 4x130 pattern is unique to the model (shared only distantly with early VW/Porsche parts-bin hubs); 15x7 Fuchs-style wheels under steel GT flares are the most common forged upgrade path, with 15x8 rears documented at low offset once flares are fitted. Stock narrow steel wheels (15x5.5) remain common on unmodified survivors.
Offset & Backspacing Reference
Backspacing is calculated as wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance):
- OE: F 15x5.5J ET23 → ~4.16″ F backspacing, R 15x5.5J ET23 → ~4.16″ R backspacing
- Flush: F 15x7J ET23 → ~4.91″ F backspacing, R 15x7J ET23 → ~4.91″ R backspacing
- Max: F 15x8J ET16 → ~5.13″ F backspacing, R 15x8J ET16 → ~5.13″ 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 914-4? 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 914-4 use?
The 1970 Porsche 914-4 uses a 4x130 bolt pattern.
How many lug bolts does the Porsche 914-4 use?
The Porsche 914-4 uses a 4-lug bolt pattern (4x130), so you need a 4-lug forged wheel to bolt straight on.
What is the biggest wheel size I can fit on my Porsche 914-4 without rubbing?
The most aggressive fitment we recommend without fender work is F 15x8J ET16 / R 15x8J ET16. 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 914-4?
For a flush look with minimal to no rubbing, we recommend F 15x7J ET23 / R 15x7J ET23 as a starting point on a stock or mildly lowered Porsche 914-4.
Do I need wheel spacers for my Porsche 914-4?
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 914-4?
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 4.91" backspacing up front and 4.91" 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 914-4?
Yes — the Porsche 914-4'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: 15x5.5 wheels · 15 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.