Mercedes-Benz SL 63 AMG Edition IWC (2009) Wheel Fitment
Mercedes-Benz SL 63 AMG Edition IWC (2009): 5x112 bolt pattern, 66.6mm center bore. Factory wheels: F: 19x8.5J R: 19x9.5J. Reference fitment ranges.
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Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | F: 19x8.5J R: 19x9.5J |
| Flush Fitment | F 20x9.0J ET32 / R 20x10.0J ET38 |
| Maximum Aggressive | F 21x9.5J ET28 / R 21x10.5J ET32 |
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 Mercedes-Benz SL 63 AMG Edition IWC's chassis.
The Mercedes-Benz SL 63 AMG Edition IWC runs a 5x112 bolt pattern, 66.6mm center bore, and a F: 19x8.5J wheel from the factory. Our Flush Fitment reference is F 20x9.0J ET32 / R 20x10.0J ET38, which tucks the tire under the fender lip on a stock-height Mercedes-Benz SL 63 AMG Edition IWC. Our Maximum Aggressive reference is F 21x9.5J ET28 / R 21x10.5J ET32 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Mercedes-Benz SL 63 AMG Edition IWC OE Wheel Specs
The 2009 Mercedes-Benz SL 63 AMG Edition IWC (Limited Roadster) uses a 5x112 bolt pattern with a 66.6mm center bore. Factory wheels are F: 19x8.5J R: 19x9.5J.
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 20x9.0J ET32 / R 20x10.0J ET38 is the recommended starting point on a stock or mildly lowered Mercedes-Benz SL 63 AMG Edition IWC.
Maximum Aggressive Fitment
F 21x9.5J ET28 / R 21x10.5J ET32 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 19x8.5J ET35 / R 19x9.5J ET40
Recommended setup: F 19x8.5J ET35 / R 19x9.5J ET40 | 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 20x9.0J ET34 / R 20x10.0J ET39
Recommended setup: F 20x9.0J ET34 / R 20x10.0J ET39 | 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 20x9.0J ET32 / R 20x10.0J ET38
Recommended setup: F 20x9.0J ET32 / R 20x10.0J ET38 | 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 21x9.5J ET30 / R 21x10.5J ET35
Recommended setup: F 21x9.5J ET30 / R 21x10.5J ET35 | 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 21x9.5J ET28 / R 21x10.5J ET32
Recommended setup: F 21x9.5J ET28 / R 21x10.5J ET32 | 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 19x8.5J ET35 / R 19x9.5J ET40 | F 20x9.0J ET34 / R 20x10.0J ET39 | F 20x9.0J ET32 / R 20x10.0J ET38 | F 21x9.5J ET30 / R 21x10.5J ET35 | F 21x9.5J ET28 / R 21x10.5J ET32 |
| 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 19x8.5J ET35 / R 19x9.5J ET40
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 20x9.0J ET32 / R 20x10.0J ET38
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 21x9.5J ET28 / R 21x10.5J ET32
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 19x8.5J ET35 → ~6.13″ F backspacing, R 19x9.5J ET40 → ~6.82″ R backspacing
- Flush: F 20x9.0J ET32 → ~6.26″ F backspacing, R 20x10.0J ET38 → ~7″ R backspacing
- Max: F 21x9.5J ET28 → ~6.35″ F backspacing, R 21x10.5J ET32 → ~7.01″ 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 Mercedes-Benz spec, or want a wheel built to a custom offset for your Mercedes-Benz SL 63 AMG Edition IWC? 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 Mercedes-Benz SL 63 AMG Edition IWC use?
How many lug bolts does the Mercedes-Benz SL 63 AMG Edition IWC use?
What is the center bore size on the Mercedes-Benz SL 63 AMG Edition IWC?
What size are the factory (stock) wheels on the Mercedes-Benz SL 63 AMG Edition IWC?
What is the biggest wheel size I can fit on my Mercedes-Benz SL 63 AMG Edition IWC without rubbing?
What does a flush wheel fitment look like on the Mercedes-Benz SL 63 AMG Edition IWC?
Do I need wheel spacers for my Mercedes-Benz SL 63 AMG Edition IWC?
How do I calculate wheel backspacing for my Mercedes-Benz SL 63 AMG Edition IWC?
What's the difference between wheel offset and backspacing?
Can I run staggered wheels (different sizes front and rear) on my Mercedes-Benz SL 63 AMG Edition IWC?
Wheel Installation Reference: Torque, Thread & TPMS
Thread & Fastener: M14x1.5, ball-seat lug bolt.
Factory Torque Spec: 130 Nm (96 ft-lb). Sedan/coupe platforms (E-Class, CLS, SL and similar) generally use the shorter 27mm bolt at this spec.
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.