Ford Mustang Shelby GT500 Conv (2011) Wheel Fitment
Ford Mustang Shelby GT500 Conv (2011): 5x114.3 bolt pattern, 70.5mm center bore. Factory wheels: F: 19x9.5J R: 20x10.0J. Reference fitment ranges.
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Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | F: 19x9.5J R: 20x10.0J |
| Flush Fitment | F 20x10.0J ET35 / R 20x11.0J ET40 |
| Maximum Aggressive | F 20x10.5J ET30 / R 20x11.5J ET35 |
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 Shelby GT500 Conv runs a 5x114.3 bolt pattern, 70.5mm center bore, and a F: 19x9.5J wheel from the factory. Our Flush Fitment reference is F 20x10.0J ET35 / R 20x11.0J ET40, which tucks the tire under the fender lip on a stock-height Ford Mustang Shelby GT500 Conv. Our Maximum Aggressive reference is F 20x10.5J ET30 / R 20x11.5J ET35 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Ford Mustang Shelby GT500 Conv OE Wheel Specs
The 2011 Ford Mustang Shelby GT500 Conv (Convertible) uses a 5x114.3 bolt pattern with a 70.5mm center bore. Factory wheels are F: 19x9.5J R: 20x10.0J.
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 20x10.0J ET35 / R 20x11.0J ET40 is the recommended starting point on a stock or mildly lowered Ford Mustang Shelby GT500 Conv.
Maximum Aggressive Fitment
F 20x10.5J ET30 / R 20x11.5J ET35 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 19x9.5J ET45 / R 20x10.0J ET52
Recommended setup: F 19x9.5J ET45 / R 20x10.0J ET52 | 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 20x10.0J ET40 / R 20x10.5J ET46
Recommended setup: F 20x10.0J ET40 / R 20x10.5J ET46 | 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 20x10.0J ET35 / R 20x11.0J ET40
Recommended setup: F 20x10.0J ET35 / R 20x11.0J ET40 | 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 20x10.5J ET33 / R 20x11.5J ET38
Recommended setup: F 20x10.5J ET33 / R 20x11.5J ET38 | 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 20x10.5J ET30 / R 20x11.5J ET35
Recommended setup: F 20x10.5J ET30 / R 20x11.5J ET35 | 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 19x9.5J ET45 / R 20x10.0J ET52 | F 20x10.0J ET40 / R 20x10.5J ET46 | F 20x10.0J ET35 / R 20x11.0J ET40 | F 20x10.5J ET33 / R 20x11.5J ET38 | F 20x10.5J ET30 / R 20x11.5J ET35 |
| 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 19x9.5J ET45 / R 20x10.0J ET52
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 20x10.0J ET35 / R 20x11.0J ET40
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 20x10.5J ET30 / R 20x11.5J ET35
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 19x9.5J ET45 → ~7.02″ F backspacing, R 20x10.0J ET52.5 → ~7.57″ R backspacing
- Flush: F 20x10.0J ET35 → ~6.88″ F backspacing, R 20x11.0J ET40 → ~7.57″ R backspacing
- Max: F 20x10.5J ET30 → ~6.93″ F backspacing, R 20x11.5J ET35 → ~7.63″ 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 Shelby GT500 Conv? 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 Shelby GT500 Conv use?
How many lug bolts does the Ford Mustang Shelby GT500 Conv use?
What is the center bore size on the Ford Mustang Shelby GT500 Conv?
What size are the factory (stock) wheels on the Ford Mustang Shelby GT500 Conv?
What is the biggest wheel size I can fit on my Ford Mustang Shelby GT500 Conv without rubbing?
What does a flush wheel fitment look like on the Ford Mustang Shelby GT500 Conv?
Do I need wheel spacers for my Ford Mustang Shelby GT500 Conv?
How do I calculate wheel backspacing for my Ford Mustang Shelby GT500 Conv?
What's the difference between wheel offset and backspacing?
Can I run staggered wheels (different sizes front and rear) on my Ford Mustang Shelby GT500 Conv?
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: TPMS (Tire Pressure Monitoring System) has been federally mandated on all new light vehicles sold in the US since the 2008 model year. If your wheels use OE-style sensors, have them transferred or cloned to the new wheels at installation.
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.