Porsche 911 Turbo 3.0 Coupe (1975) Wheel Fitment
Porsche 911 Turbo 3.0 Coupe (1975): 5x130 bolt pattern, 71.6mm center bore. Factory wheels: F: 15x7J R: 15x8J. Reference fitment ranges.
Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | F: 15x7J R: 15x8J |
| Flush Fitment | F 16x7J ET23 / R 16x8J ET15 |
| Maximum Aggressive | F 16x9J ET15 / R 17x9J ET29 |
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.
Porsche 911 Turbo 3.0 Coupe OE Wheel Specs
The 1975 Porsche 911 Turbo 3.0 Coupe (Supercar) uses a 5x130 bolt pattern with a 71.6mm center bore. Factory wheels are F: 15x7J R: 15x8J.
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
Flush Fitment
For a flush look with minimal rubbing, F 16x7J ET23 / R 16x8J ET15 is the recommended starting point on a stock or mildly lowered Porsche 911 Turbo 3.0 Coupe.
Maximum Aggressive Fitment
F 16x9J ET15 / R 17x9J ET29 is a more aggressive reference setup. Beyond this, expect rubbing under compression without fender rolling or camber correction.
Real-World Fitment Notes
930 builds run staggered Fuchs (16x7/16x8) or Fikse Fuchs-style 17x9/17x11, deep-dish RSR-style setups popular 5x130 / 71.6 CB; widebody flares allow wide rears, measure flare clearance (6SpeedOnline/Rennlist) F 15x7J ET23.3 / R 15x8J ET15 Fuchs (5x130, 71.6 CB)
5-Tier Configuration Options
A Factory-Style F 15x7.0J ET23 / R 15x8.0J ET10
Recommended setup: F 15x7.0J ET23 / R 15x8.0J ET10 | Economy impact: Negligible | Best for: Daily commuting, family use
Appearance: 7/10 | Comfort: 9.5/10 | Install difficulty: ★☆☆☆☆
Estimated cost: $450-800 (wheels + tires + install)
B Comfortable Upgrade F 16x7.0J ET23 / R 16x8.0J ET13
Recommended setup: F 16x7.0J ET23 / R 16x8.0J ET13 | 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 16x7.0J ET23 / R 16x8.0J ET15
Recommended setup: F 16x7.0J ET23 / R 16x8.0J ET15 | 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 16x8.0J ET19 / R 17x8.5J ET22
Recommended setup: F 16x8.0J ET19 / R 17x8.5J ET22 | 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 16x9.0J ET15 / R 17x9.0J ET29
Recommended setup: F 16x9.0J ET15 / R 17x9.0J ET29 | 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 15x7.0J ET23 / R 15x8.0J ET10 | F 16x7.0J ET23 / R 16x8.0J ET13 | F 16x7.0J ET23 / R 16x8.0J ET15 | F 16x8.0J ET19 / R 17x8.5J ET22 | F 16x9.0J ET15 / R 17x9.0J ET29 |
| 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 | $450-800 | $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 15x7.0J ET23 / R 15x8.0J ET10
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 16x7.0J ET23 / R 16x8.0J ET15
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 16x9.0J ET15 / R 17x9.0J ET29
Cost: ~$5,500
Outcome: Maximum visual impact; daily comfort and fuel economy are heavily compromised, physical test fit required before production.
Decision Guide
Offset & Backspacing Reference
Backspacing is calculated as wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance):
- OE: F 15x7J ET23 → ~4.91″ F backspacing, R 15x8J ET10 → ~4.89″ R backspacing
- Flush: F 16x7J ET23 → ~4.91″ F backspacing, R 16x8J ET15 → ~5.09″ R backspacing
- Max: F 16x9J ET15 → ~5.59″ F backspacing, R 17x9J ET29 → ~6.14″ 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 911 Turbo 3.0 Coupe? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.