Ford Mustang SVT Cobra Convertible (2004) Wheel Fitment
Ford Mustang SVT Cobra Convertible (2004): 5x114.3 bolt pattern, 70.5mm center bore. Factory wheels: F: 17x9.0J R: 17x9.0J. Reference fitment ranges.
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Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | F: 17x9.0J R: 17x9.0J |
| Flush Fitment | F 18x9.5J ET25 / R 18x10.5J ET25 |
| Maximum Aggressive | F 18x10.0J ET20 / R 18x11.0J ET20 |
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 Ford Mustang SVT Cobra Convertible runs a 5x114.3 bolt pattern, 70.5mm center bore, and a F: 17x9.0J wheel from the factory. Our Flush Fitment reference is F 18x9.5J ET25 / R 18x10.5J ET25, which tucks the tire under the fender lip on a stock-height Ford Mustang SVT Cobra Convertible. Our Maximum Aggressive reference is F 18x10.0J ET20 / R 18x11.0J ET20 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Ford Mustang SVT Cobra Convertible OE Wheel Specs
The 2004 Ford Mustang SVT Cobra Convertible (Convertible) uses a 5x114.3 bolt pattern with a 70.5mm center bore. Factory wheels are F: 17x9.0J R: 17x9.0J.
Why the factory spec works for most owners:
- Balances ride comfort with everyday fuel efficiency
- A widely used size in this segment, so tire and wheel availability stays strong
- Keeps unsprung weight low for stable, predictable handling
- Maintains clearance for the factory brake calipers and suspension components
Flush Fitment
For a flush look with minimal rubbing, F 18x9.5J ET25 / R 18x10.5J ET25 is the recommended starting point on a stock or mildly lowered Ford Mustang SVT Cobra Convertible.
Maximum Aggressive Fitment
F 18x10.0J ET20 / R 18x11.0J ET20 is a more aggressive reference setup. Beyond this, expect rubbing under compression without fender rolling or camber correction.
5-Tier Configuration Options
A Factory-Style F 17x9.0J ET30 / R 17x9.0J ET30
Recommended setup: F 17x9.0J ET30 / R 17x9.0J ET30 | 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 18x9.5J ET28 / R 18x10.0J ET28
Recommended setup: F 18x9.5J ET28 / R 18x10.0J ET28 | 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 18x9.5J ET25 / R 18x10.5J ET25
Recommended setup: F 18x9.5J ET25 / R 18x10.5J ET25 | 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 18x10.0J ET23 / R 18x11.0J ET23
Recommended setup: F 18x10.0J ET23 / R 18x11.0J ET23 | 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 18x10.0J ET20 / R 18x11.0J ET20
Recommended setup: F 18x10.0J ET20 / R 18x11.0J ET20 | 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 17x9.0J ET30 / R 17x9.0J ET30 | F 18x9.5J ET28 / R 18x10.0J ET28 | F 18x9.5J ET25 / R 18x10.5J ET25 | F 18x10.0J ET23 / R 18x11.0J ET23 | F 18x10.0J ET20 / R 18x11.0J ET20 |
| 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 17x9.0J ET30 / R 17x9.0J ET30
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 18x9.5J ET25 / R 18x10.5J ET25
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 18x10.0J ET20 / R 18x11.0J ET20
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 17x9.0J ET30 → ~6.18″ F backspacing, R 17x9.0J ET30 → ~6.18″ R backspacing
- Flush: F 18x9.5J ET25 → ~6.23″ F backspacing, R 18x10.5J ET25 → ~6.73″ R backspacing
- Max: F 18x10.0J ET20 → ~6.29″ F backspacing, R 18x11.0J ET20 → ~6.79″ R backspacing
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 Ford spec, or want a wheel built to a custom offset for your Ford Mustang SVT Cobra Convertible? 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 Ford Mustang SVT Cobra Convertible use?
How many lug bolts does the Ford Mustang SVT Cobra Convertible use?
What is the center bore size on the Ford Mustang SVT Cobra Convertible?
What size are the factory (stock) wheels on the Ford Mustang SVT Cobra Convertible?
What is the biggest wheel size I can fit on my Ford Mustang SVT Cobra Convertible without rubbing?
What does a flush wheel fitment look like on the Ford Mustang SVT Cobra Convertible?
Do I need wheel spacers for my Ford Mustang SVT Cobra Convertible?
How do I calculate wheel backspacing for my Ford Mustang SVT Cobra Convertible?
What's the difference between wheel offset and backspacing?
Can I run staggered wheels (different sizes front and rear) on my Ford Mustang SVT Cobra Convertible?
Wheel Installation Reference: Torque, Thread & TPMS
Thread & Fastener: M12x1.5, conical-seat lug nut.
Factory Torque Spec: 136 Nm (100 ft-lb). Covers most Ford passenger cars and crossovers (Fusion, Focus, Escape and similar) on M12x1.5 studs.
TPMS: Vehicles built before the 2008 model year were not federally required to carry factory TPMS in the US, though many manufacturers adopted it earlier; verify whether your specific build has TPMS before ordering sensor-compatible wheels.
Tire Pressure: Always set tire pressure to the value on your vehicle's tire placard (driver's doorjamb or glovebox), not the max PSI printed on the tire sidewall — this is trim- and tire-size-specific and stays the same reference point when you switch to a different wheel and tire combination.
Reference data compiled from published OEM service specifications and cross-checked against independent repair sources; always confirm against your owner's manual or door-jamb placard before installation.