Fiat 124 Spider S-Design (2018) Wheel Fitment
Fiat 124 Spider S-Design (2018): 4x100 bolt pattern, 54.1mm center bore. Factory wheels: 16x6.5J F/R. Reference fitment ranges.
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Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | 16x6.5J F/R |
| Flush Fitment | 17x7.5J at ET35 offset |
| Maximum Aggressive | 18x8.0J at ET32 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
With less structural stiffness from the missing roof, a convertible's suspension tuning leans more heavily on unsprung mass control. Forged construction keeps wheel weight down at the same strength rating, which is one less variable working against the Fiat 124 Spider S-Design's chassis.
The Fiat 124 Spider S-Design runs a 4x100 bolt pattern, 54.1mm center bore, and a 16x6.5J, front and rear, wheel from the factory. Our Flush Fitment reference is 17x7.5J ET35, which tucks the tire under the fender lip on a stock-height Fiat 124 Spider S-Design. Our Maximum Aggressive reference is 18x8.0J ET32 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Fiat 124 Spider S-Design OE Wheel Specs
The 2018 Fiat 124 Spider S-Design (Roadster) uses a 4x100 bolt pattern with a 54.1mm center bore. Factory wheels are 16x6.5J 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 17x7.5J ET35 is the recommended starting point on a stock or mildly lowered Fiat 124 Spider S-Design.
Maximum Aggressive Fitment
F/R 18x8.0J 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 16x6.5J ET40
Recommended setup: 16x6.5J ET40 | 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 17x7.0J ET38
Recommended setup: 17x7.0J ET38 | 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 17x7.5J ET35
Recommended setup: 17x7.5J ET35 | 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 18x8.0J ET34
Recommended setup: 18x8.0J ET34 | 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 18x8.0J ET32
Recommended setup: 18x8.0J 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 | 16x6.5J ET40 | 17x7.0J ET38 | 17x7.5J ET35 | 18x8.0J ET34 | 18x8.0J 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: 16x6.5J ET40
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: 17x7.5J ET35
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: 18x8.0J 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: 16x6.5J ET40 → ~5.32″ backspacing
- Flush: 17x7.5J ET35 → ~5.63″ backspacing
- Max: 18x8.0J ET32 → ~5.76″ 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 Fiat spec, or want a wheel built to a custom offset for your Fiat 124 Spider S-Design? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.