Porsche 911 GT3 RS Weissach Package (2019) Wheel Fitment
Porsche 911 GT3 RS Weissach Package (2019): Centerlock bolt pattern, 71.6mm center bore. Factory wheels: F: 20x9.5J R: 21x12.5J. Reference fitment ranges.
Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Flush Fitment | F 19x9.5J ET50 / R 20x12.5J ET48 |
| Maximum Aggressive | F 19x10.0J ET42 / R 19x13.0J ET45 |
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 GT3 RS Weissach Package OE Wheel Specs
The 2019 Porsche 911 GT3 RS Weissach Package (Sports Coupe) uses a Centerlock bolt pattern with a 71.6mm center bore. Factory wheels are F: 20x9.5J R: 21x12.5J.
Why the factory spec works for most owners:
- Keeps unsprung weight low to preserve the factory handling balance
- Matches the wider, performance-oriented tire sizing typical of this platform
- Maintains clearance for the factory brake package and suspension geometry
- Balances grip with ride comfort for daily and spirited driving
Flush Fitment
For a flush look, F 19x9.5J ET50 / R 20x12.5J ET48 is a commonly used starting point — clearance must be verified on a stock or mildly lowered Porsche 911 GT3 RS Weissach Package.
Maximum Aggressive Fitment
F 19x10.0J ET42 / R 19x13.0J ET45 is a more aggressive reference setup. Beyond this, expect rubbing under compression without fender rolling or camber correction.
5-Tier Configuration Options
Factory-Style
F 20x9.5J ET50 / R 21x12.5J ET48Recommended setup: F 20x9.5J ET50 / R 21x12.5J ET48 | 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)
Comfortable Upgrade
F 20x9.5J ET50 / R 21x12.5J ET48Recommended setup: F 20x9.5J ET50 / R 21x12.5J ET48 | 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)
Balanced / Flush Fit
F 19x9.5J ET50 / R 20x12.5J ET48Recommended setup: F 19x9.5J ET50 / R 20x12.5J ET48 | 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)
Aggressive
F 19x10.0J ET46 / R 20x13.0J ET47Recommended setup: F 19x10.0J ET46 / R 20x13.0J ET47 | 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)
Max Aggressive
F 19x10.0J ET42 / R 19x13.0J ET45Recommended setup: F 19x10.0J ET42 / R 19x13.0J ET45 | 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 20x9.5J ET50 / R 21x12.5J ET48 | F 20x9.5J ET50 / R 21x12.5J ET48 | F 19x9.5J ET50 / R 20x12.5J ET48 | F 19x10.0J ET46 / R 20x13.0J ET47 | F 19x10.0J ET42 / R 19x13.0J ET45 |
| 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 20x9.5J ET50 / R 21x12.5J ET48
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 19x9.5J ET50 / R 20x12.5J ET48
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 19x10.0J ET42 / R 19x13.0J ET45
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 20x9.5J ET50 → ~7.22″ F backspacing, R 21x12.5J ET48 → ~8.64″ R backspacing
- Flush: F 19x9.5J ET50 → ~7.22″ F backspacing, R 20x12.5J ET48 → ~8.64″ R backspacing
- Max: F 19x10.0J ET42 → ~7.15″ F backspacing, R 19x13.0J ET45 → ~8.77″ 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 GT3 RS Weissach Package? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.