Alfa Romeo Spider (Series 3) (1983) Wheel Fitment
Alfa Romeo Spider (Series 3) (1983): 4x108 bolt pattern, 70.1mm center bore. Factory wheels: 14x6.0J F/R. Reference fitment ranges.
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Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | 14x6.0J F/R |
| Flush Fitment | 15x7.0J at ET20 offset |
| Maximum Aggressive | 16x7.5J at ET15 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 Alfa Romeo Spider (Series 3) runs a 4x108 bolt pattern, 70.1mm center bore, and a 14x6.0J, front and rear, wheel from the factory. Our Flush Fitment reference is 15x7.0J ET20, which tucks the tire under the fender lip on a stock-height Alfa Romeo Spider (Series 3). Our Maximum Aggressive reference is 16x7.5J ET15 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Alfa Romeo Spider (Series 3) OE Wheel Specs
The 1983 Alfa Romeo Spider (Series 3) (Roadster) uses a 4x108 bolt pattern with a 70.1mm center bore. Factory wheels are 14x6.0J F/R.
Why the factory spec works for most owners:
- Balances ride comfort with everyday fuel efficiency
- A widely used size in this segment, so tire and wheel availability stays strong
- Keeps unsprung weight low for stable, predictable handling
- Maintains clearance for the factory brake calipers and suspension components
Flush Fitment
For a flush look with minimal rubbing, F/R 15x7.0J ET20 is the recommended starting point on a stock or mildly lowered Alfa Romeo Spider (Series 3).
Maximum Aggressive Fitment
F/R 16x7.5J ET15 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 14x6.0J ET25
Recommended setup: 14x6.0J ET25 | 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 15x6.5J ET23
Recommended setup: 15x6.5J ET23 | 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 15x7.0J ET20
Recommended setup: 15x7.0J ET20 | 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 16x7.5J ET18
Recommended setup: 16x7.5J ET18 | 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 16x7.5J ET15
Recommended setup: 16x7.5J ET15 | 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 | 14x6.0J ET25 | 15x6.5J ET23 | 15x7.0J ET20 | 16x7.5J ET18 | 16x7.5J ET15 |
| 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: 14x6.0J ET25
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: 15x7.0J ET20
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: 16x7.5J ET15
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: 14x6.0J ET25 → ~4.48″ backspacing
- Flush: 15x7.0J ET20 → ~4.79″ backspacing
- Max: 16x7.5J ET15 → ~4.84″ 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 Alfa Romeo spec, or want a wheel built to a custom offset for your Alfa Romeo Spider (Series 3)? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.