Lamborghini Diablo Roadster (1996) Wheel Fitment
Lamborghini Diablo Roadster (1996): 5x120.65 bolt pattern, 70.3mm center bore, OE F 17x8.5J ET32 / R 17x13J ET30. Forged wheel fitment specs from ANKUSI.
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Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Flush Fitment | F 18x9J ET25 / R 18x13.5J ET25 |
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 Lamborghini Diablo Roadster ships from the factory on a 5x120.65 bolt pattern with a 70.3mm center bore and a F 17x8.5J ET32 / R 17x13J ET30 wheel. Our flush reference for the Lamborghini Diablo Roadster is F 18x9J ET25 / R 18x13.5J ET25.; our maximum aggressive reference is F 19x9J ET20 / R 19x14J ET20. — beyond that, expect clearance issues against the fender liner without further modification.
Lamborghini Diablo Roadster OE Wheel Specs
The Lamborghini Diablo Roadster ships from the factory on 5x120.65 bolt pattern wheels with a 70.3mm center bore. The stock wheel size is F 17x8.5J ET32 / R 17x13J ET30, 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 Lamborghini Diablo Roadster owners run F 18x9J ET25 / R 18x13.5J ET25. 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 F 19x9J ET20 / R 19x14J ET20. Wheels: 5x120.65 PCD. 17-inch to 18-inch upgrade is common for tire availability. Clearance should be verified before ordering, especially on lowered cars.
5-Tier Configuration Options
A – Factory-Style: 17x8.5J ET32
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: $$ (OE replacement)
B – Comfortable Upgrade: F 17.5x9J ET29 / R 17.5x13.5J ET28
Recommended setup: Direct bolt-on, factory suspension
Economy impact: Minimal
Best for: Owners who want a mild upgrade with no compromise
Appearance 6/10 | Comfort 9/10 | Install difficulty ★☆☆☆
Estimated cost range: $$ - $$$
C – Balanced / Flush Fit: F 18x9J ET25 / R 18x13.5J ET25
Recommended setup: Flush forged wheels, stock or mild lowering
Economy impact: Slight increase
Best for: Enthusiasts wanting a flush look daily
Appearance 8/10 | Comfort 7/10 | Install difficulty ★★☆☆
Estimated cost range: $$$
D – Aggressive: F 18.5x9J ET23 / R 18.5x14J ET23
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: $$$$
E – Max Aggressive: F 19x9J ET20 / R 19x14J ET20
Recommended setup: Wheels: 5x120.65 PCD. 17-inch to 18-inch upgrade is common for tire availability.
Economy impact: Significant increase
Best for: Show builds, weekend cars
Appearance 10/10 | Comfort 3/10 | Install difficulty ★★★★
Estimated cost range: $$$$$
Performance Comparison Matrix
| Wheel Spec | Tier A | Tier B | Tier C | Tier D | Tier E |
|---|---|---|---|---|---|
| Wheel Spec | 17x8.5J ET32 | F 17.5x9J ET29 / R 17.5x13.5J ET28 | F 18x9J ET25 / R 18x13.5J ET25 | F 18.5x9J ET23 / R 18.5x14J ET23 | F 19x9J ET20 / R 19x14J ET20 |
| Economy Impact | None | Minimal | Slight increase | Noticeable increase | Significant increase |
| Appearance | 5/10 | 6/10 | 8/10 | 9/10 | 10/10 |
| Comfort | 10/10 | 9/10 | 7/10 | 5/10 | 3/10 |
| Install Difficulty | ★☆☆☆ | ★☆☆☆ | ★★☆☆ | ★★★☆ | ★★★★ |
| Cost Range | $$ (OE replacement) | $$ - $$$ | $$$ | $$$$ | $$$$$ |
| Best For | Daily drivers, warranty-conscious owners | Owners who want a mild upgrade with no compromise | Enthusiasts wanting a flush look daily | Show-and-drive builds | Show builds, weekend cars |
Real-World Reference Cases
The following builds are compiled from typical ANKUSI customer configurations for this platform and are illustrative, not individually verified real-world builds.
Case 1: Daily Driver (Factory-Style)
Profile: Commuter prioritizing comfort and reliability.
Setup: F 17x8.5J ET32 / R 17x13J ET30 forged wheels, factory suspension.
Cost: $$ (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: F 18x9J ET25 / R 18x13.5J ET25 forged wheels.
Cost: $$$
Outcome: Flush fitment with acceptable ride comfort for daily use.
Case 3: Show Build (Max Aggressive)
Profile: Show-and-shine build prioritizing stance over comfort.
Setup: F 19x9J ET20 / R 19x14J ET20 forged wheels. Wheels: 5x120.65 PCD. 17-inch to 18-inch upgrade is common for tire availability.
Cost: $$$$$
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 17x8.5J ET32: backspacing ≈ 6.01"
- Flush 18x9J ET25: backspacing ≈ 5.98"
- Max 19x9J ET20: backspacing ≈ 5.79"
Use our offset & backspacing calculator to fine-tune your fitment, or contact ANKUSI for a custom forged wheel quote for your Lamborghini Diablo Roadster.