Wiesmann Roadster (2006) Wheel Fitment
Wiesmann Roadster (2006): 5x120 bolt pattern, 72.5mm center bore, OE 17x8J ET35. Forged wheel fitment specs from ANKUSI.
✓ Verified by ANKUSI's Engineering Team — IATF 16949 & ISO 9001 certified forged wheel manufacturer, TÜV/SFI/VIA compliant. See our factory & certifications →
Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Flush Fitment | 18x8.5J at ET30 offset |
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 Wiesmann Roadster ships from the factory on a 5x120 bolt pattern with a 72.5mm center bore and a 17x8J ET35 wheel. Our flush reference for the Wiesmann Roadster is 18x8.5J ET30.; our maximum aggressive reference is 18x9J ET25. — beyond that, expect clearance issues against the fender liner without further modification.
Wiesmann Roadster OE Wheel Specs
The Wiesmann Roadster ships from the factory on 5x120 bolt pattern wheels with a 72.5mm center bore. The stock wheel size is 17x8J ET35, offering a balanced ride that suits most owners without any rubbing or clearance concerns.
Why the factory spec works for most owners:
- Balances ride comfort with steering response and highway efficiency.
- Wide tire and wheel availability at the factory diameter keeps replacement costs low.
- Lower unsprung weight than larger aftermarket wheels helps ride quality and acceleration.
- Guaranteed clearance against brake calipers and suspension components.
Flush Fitment
For a flush look without any body modification, most Wiesmann Roadster owners run 18x8.5J ET30. This setup tucks the wheel face closer to the fender lip while staying within safe load and clearance limits.
Maximum Aggressive Fitment
Owners chasing a more aggressive stance push to 18x9J ET25. Bilstein sport suspension; 18-inch classic multi-spoke alloy wheels; upgraded slotted brake rotors; Continental SportContact tires. Note: Classic BMW inline-6 powered roadster (MF3 variant) featuring timeless retro styling and aluminum spaceframe construction. Clearance should be verified before ordering, especially on lowered cars.
5-Tier Configuration Options
A – Factory-Style: 17x8J ET35
Recommended setup: Factory-matched forged replacement
Economy impact: None
Best for: Daily drivers, warranty-conscious owners
Appearance 5/10 | Comfort 10/10 | Install difficulty ★☆☆☆
Estimated cost range: $$ (OE replacement)
B – Comfortable Upgrade: 17.5x8.5J ET33
Recommended setup: Direct bolt-on, factory suspension
Economy impact: Minimal
Best for: Owners who want a mild upgrade with no compromise
Appearance 6/10 | Comfort 9/10 | Install difficulty ★☆☆☆
Estimated cost range: $$ - $$$
C – Balanced / Flush Fit: 18x8.5J ET30
Recommended setup: Flush forged wheels, stock or mild lowering
Economy impact: Slight increase
Best for: Enthusiasts wanting a flush look daily
Appearance 8/10 | Comfort 7/10 | Install difficulty ★★☆☆
Estimated cost range: $$$
D – Aggressive: 18x9J ET28
Recommended setup: Wider forged wheels, coilovers or lowering springs
Economy impact: Noticeable increase
Best for: Show-and-drive builds
Appearance 9/10 | Comfort 5/10 | Install difficulty ★★★☆
Estimated cost range: $$$$
E – Max Aggressive: 18x9J ET25
Recommended setup: Bilstein sport suspension; 18-inch classic multi-spoke alloy wheels; upgraded slotted brake rotors; Continental SportContact tires. Note: Classic BMW inline-6 powered roadster (MF3 variant) featuring timeless retro styling and aluminum spaceframe construction.
Economy impact: Significant increase
Best for: Show builds, weekend cars
Appearance 10/10 | Comfort 3/10 | Install difficulty ★★★★
Estimated cost range: $$$$$
Performance Comparison Matrix
| Wheel Spec | Tier A | Tier B | Tier C | Tier D | Tier E |
|---|---|---|---|---|---|
| Wheel Spec | 17x8J ET35 | 17.5x8.5J ET33 | 18x8.5J ET30 | 18x9J ET28 | 18x9J ET25 |
| Economy Impact | None | Minimal | Slight increase | Noticeable increase | Significant increase |
| Appearance | 5/10 | 6/10 | 8/10 | 9/10 | 10/10 |
| Comfort | 10/10 | 9/10 | 7/10 | 5/10 | 3/10 |
| Install Difficulty | ★☆☆☆ | ★☆☆☆ | ★★☆☆ | ★★★☆ | ★★★★ |
| Cost Range | $$ (OE replacement) | $$ - $$$ | $$$ | $$$$ | $$$$$ |
| Best For | Daily drivers, warranty-conscious owners | Owners who want a mild upgrade with no compromise | Enthusiasts wanting a flush look daily | Show-and-drive builds | Show builds, weekend cars |
Real-World Reference Cases
The following builds are compiled from typical ANKUSI customer configurations for this platform and are illustrative, not individually verified real-world builds.
Case 1: Daily Driver (Factory-Style)
Profile: Commuter prioritizing comfort and reliability.
Setup: 17x8J ET35 forged wheels, factory suspension.
Cost: $$ (OE replacement)
Outcome: No clearance issues, factory ride quality retained.
Case 2: Balanced Enthusiast (Balanced / Flush Fit)
Profile: Weekend driver wanting a flush stance without sacrificing daily usability.
Setup: 18x8.5J ET30 forged wheels, mild lowering springs.
Cost: $$$
Outcome: Flush fitment with acceptable ride comfort for daily use.
Case 3: Show Build (Max Aggressive)
Profile: Show-and-shine build prioritizing stance over comfort.
Setup: 18x9J ET25 forged wheels. Bilstein sport suspension; 18-inch classic multi-spoke alloy wheels; upgraded slotted brake rotors; Continental SportContact tires. Note: Classic BMW inline-6 powered roadster (MF3 variant) featuring timeless retro styling and aluminum spaceframe construction.
Cost: $$$$$
Outcome: Maximum aggressive stance; clearance verified case-by-case.
Decision Guide
Offset & Backspacing Reference
Backspacing is calculated as: wheel width (in) / 2 + offset (mm) / 25.4 + 0.5.
- OE 17x8J ET35: backspacing ≈ 5.88"
- Flush 18x8.5J ET30: backspacing ≈ 5.93"
- Max 18x9J ET25: backspacing ≈ 5.98"
Use our offset & backspacing calculator to fine-tune your fitment, or contact ANKUSI for a custom forged wheel quote for your Wiesmann Roadster.