Mercedes-Benz SLR McLaren Roadster (2008) Wheel Fitment
Mercedes-Benz SLR McLaren Roadster (2008): 5x112 bolt pattern, 66.6mm center bore. Factory wheels: F: 19x9.0J R: 19x11.5J. Reference fitment ranges.
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Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | F: 19x9.0J R: 19x11.5J |
| Flush Fitment | F 20x9.5J ET32 / R 20x12.0J ET38 |
| Maximum Aggressive | F 21x10.0J ET28 / R 21x12.5J 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
On a supercar, wheel weight is one of the few remaining places to cut rotational mass without touching the powertrain or chassis the factory already optimized. Forging gets there at the same structural margin as the OE wheel, which is exactly the trade a car built around outright performance rewards.
The Mercedes-Benz SLR McLaren Roadster runs a 5x112 bolt pattern, 66.6mm center bore, and a F: 19x9.0J wheel from the factory. Our Flush Fitment reference is F 20x9.5J ET32 / R 20x12.0J ET38, which tucks the tire under the fender lip on a stock-height Mercedes-Benz SLR McLaren Roadster. Our Maximum Aggressive reference is F 21x10.0J ET28 / R 21x12.5J ET32 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Mercedes-Benz SLR McLaren Roadster OE Wheel Specs
The 2008 Mercedes-Benz SLR McLaren Roadster (Supercar) uses a 5x112 bolt pattern with a 66.6mm center bore. Factory wheels are F: 19x9.0J R: 19x11.5J.
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 20x9.5J ET32 / R 20x12.0J ET38 is the recommended starting point on a stock or mildly lowered Mercedes-Benz SLR McLaren Roadster.
Maximum Aggressive Fitment
F 21x10.0J ET28 / R 21x12.5J 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 19x9.0J ET44 / R 19x11.5J ET50
Recommended setup: F 19x9.0J ET44 / R 19x11.5J ET50 | 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 20x9.5J ET38 / R 20x12.0J ET44
Recommended setup: F 20x9.5J ET38 / R 20x12.0J ET44 | 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 20x9.5J ET32 / R 20x12.0J ET38
Recommended setup: F 20x9.5J ET32 / R 20x12.0J 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 21x10.0J ET30 / R 21x12.5J ET35
Recommended setup: F 21x10.0J ET30 / R 21x12.5J 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 21x10.0J ET28 / R 21x12.5J ET32
Recommended setup: F 21x10.0J ET28 / R 21x12.5J 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 19x9.0J ET44 / R 19x11.5J ET50 | F 20x9.5J ET38 / R 20x12.0J ET44 | F 20x9.5J ET32 / R 20x12.0J ET38 | F 21x10.0J ET30 / R 21x12.5J ET35 | F 21x10.0J ET28 / R 21x12.5J 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 19x9.0J ET44 / R 19x11.5J ET50
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 20x9.5J ET32 / R 20x12.0J 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 21x10.0J ET28 / R 21x12.5J 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 19x9.0J ET44 → ~6.73″ F backspacing, R 19x11.5J ET50 → ~8.22″ R backspacing
- Flush: F 20x9.5J ET32 → ~6.51″ F backspacing, R 20x12.0J ET38 → ~8″ R backspacing
- Max: F 21x10.0J ET28 → ~6.6″ F backspacing, R 21x12.5J ET32 → ~8.01″ 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 SLR McLaren Roadster? 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 SLR McLaren Roadster use?
How many lug bolts does the Mercedes-Benz SLR McLaren Roadster use?
What is the center bore size on the Mercedes-Benz SLR McLaren Roadster?
What size are the factory (stock) wheels on the Mercedes-Benz SLR McLaren Roadster?
What is the biggest wheel size I can fit on my Mercedes-Benz SLR McLaren Roadster without rubbing?
What does a flush wheel fitment look like on the Mercedes-Benz SLR McLaren Roadster?
Do I need wheel spacers for my Mercedes-Benz SLR McLaren Roadster?
How do I calculate wheel backspacing for my Mercedes-Benz SLR McLaren Roadster?
What's the difference between wheel offset and backspacing?
Can I run staggered wheels (different sizes front and rear) on my Mercedes-Benz SLR McLaren Roadster?
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.