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2015 Alfa Romeo 4C Spider Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Alfa Romeo 4C Spider wheels? This page gives the 2015 Alfa Romeo 4C Spider bolt pattern (5x98), centre bore, factory rim size and the offset range for aftermarket and forged Alfa Romeo 4C Spider rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 2015 Alfa Romeo 4C Spider uses a 5x98 bolt pattern with a 58.1 mm centre bore and M12x1.5 lug nuts. Factory wheels: F: 17x7.0J R: 18x8.5J. For aftermarket wheels, 18x8.0J ET35 front / 19x9.5J ET30 rear sits flush and 18x8.5J ET30 front / 19x10.0J ET25 rear is the most aggressive fit.
Forged wheels for the 2015 Alfa Romeo 4C Spider — drilled 5x98 with a 58.1 mm centre bore, built to the offset you choose. From $220 per wheel, made to order in 20–25 days.
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Alfa Romeo 4C Spider (2015): 5x98 bolt pattern, 58.1mm center bore. Factory wheels: F: 17x7.0J R: 18x8.5J. Reference fitment ranges.
Bolt Pattern5x98
Wheel Bolt/NutM12x1.5 Nut
Center Bore58.1mm
Wheel Load Rating650–750 kg/wheel (Standard Passenger Car segment reference)
Year2015
CategoryRoadster
✓ Data check: the bolt pattern and center bore on this page match an independent fitment reference. Last reviewed September 18, 2026. How we verify
Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | F: 17x7.0J R: 18x8.5J |
| Flush Fitment | F 18x8.0J ET35 / R 19x9.5J ET30 |
| Maximum Aggressive | F 18x8.5J ET30 / R 19x10.0J ET25 |
Forged Wheel Designs for the Alfa Romeo 4C Spider
Every design below is forged to order, so it can be machined to the Alfa Romeo 4C Spider's 5x98 bolt pattern and 58.1 mm center bore, with the width and offset calculated for your setup.
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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 4C Spider runs a 5x98 bolt pattern, 58.1mm center bore, and a F: 17x7.0J wheel from the factory. Our Flush Fitment reference is F 18x8.0J ET35 / R 19x9.5J ET30, which tucks the tire under the fender lip on a stock-height Alfa Romeo 4C Spider. Our Maximum Aggressive reference is F 18x8.5J ET30 / R 19x10.0J ET25 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Alfa Romeo 4C Spider OE Wheel Specs
The 2015 Alfa Romeo 4C Spider (Roadster) uses a 5x98 bolt pattern with a 58.1mm center bore. Factory wheels are F: 17x7.0J R: 18x8.5J.
Why the factory spec works for most owners:
- Balances ride comfort with everyday drivability
- A commonly used size for this vehicle class, supporting parts and tire availability
- Maintains clearance for the factory suspension and brake components
- Provides stable, predictable handling across normal driving conditions
ANKUSI builds these wheels — we are the forging factory, not a reseller. For the Alfa Romeo 4C Spider (2015) we drill the 5x98 pattern and cut the centre bore to 58.1mm on our own CNC line, so the wheel hub-centres on the car with no spacer rings, in whatever diameter, width and offset you specify.
Converting these ET figures to backspacing? Use the wheel offset and backspacing calculator.
The figures on this page are part of our open wheel fitment dataset — 10,093 vehicles, free to download, CC BY 4.0.
Offset & Backspacing Reference
Backspacing is calculated as wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance):
- OE: F 17x7.0J ET42 → ~5.65″ F backspacing, R 18x8.5J ET35 → ~6.13″ R backspacing
- Flush: F 18x8.0J ET35 → ~5.88″ F backspacing, R 19x9.5J ET30 → ~6.43″ R backspacing
- Max: F 18x8.5J ET30 → ~5.93″ F backspacing, R 19x10.0J ET25 → ~6.48″ R 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 4C Spider? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.
Vehicles With the Same Hub as the Alfa Romeo 4C Spider (5x98, 58.1 mm Bore)
In our database, 30 other vehicle entries from 6 makes use exactly the same 5x98 bolt pattern and 58.1 mm center bore. Factory wheels from these cars bolt on and center on the hub without rings; offset and width still have to be checked.
5x98 is used by 0.5% of the vehicle pages in our English fitment guide (32 of 6,503); 96.9% of those also use a 58.1 mm center bore.
Hub-Centric Rings for a 58.1 mm Center Bore
A wheel with a center bore larger than 58.1 mm needs a hub-centric ring. The most common combinations:
| Wheel bore | Ring size |
|---|---|
| 60.1 mm | 60.1 → 58.1 mm |
| 63.4 mm | 63.4 → 58.1 mm |
| 64.1 mm | 64.1 → 58.1 mm |
| 65.1 mm | 65.1 → 58.1 mm |
| 73.1 mm | 73.1 → 58.1 mm |
ANKUSI forged wheels are bored to exactly 58.1 mm for this vehicle, so no ring is needed.
Frequently Asked Questions
What bolt pattern (PCD) does the Alfa Romeo 4C Spider use?
The 2015 Alfa Romeo 4C Spider uses a 5x98 bolt pattern.
How many lug bolts does the Alfa Romeo 4C Spider use?
The Alfa Romeo 4C Spider uses a 5-lug bolt pattern (5x98), so you need a 5-lug forged wheel to bolt straight on.
What is the center bore size on the Alfa Romeo 4C Spider?
The Alfa Romeo 4C Spider's center bore is 58.1mm. If an aftermarket wheel has a larger center bore than this, hub-centric rings are recommended so the wheel centers on the hub itself rather than relying on the lug bolts alone.
What size are the factory (stock) wheels on the Alfa Romeo 4C Spider?
Factory wheels on the Alfa Romeo 4C Spider are F: 17x7.0J R: 18x8.5J.
What is the biggest wheel size I can fit on my Alfa Romeo 4C Spider without rubbing?
The most aggressive fitment we recommend without fender work is F 18x8.5J ET30 / R 19x10.0J ET25. Going beyond this typically causes rubbing under compression unless you roll the fenders or add camber correction.
What does a flush wheel fitment look like on the Alfa Romeo 4C Spider?
For a flush look with minimal to no rubbing, we recommend F 18x8.0J ET35 / R 19x9.5J ET30 as a starting point on a stock or mildly lowered Alfa Romeo 4C Spider.
Do I need wheel spacers for my Alfa Romeo 4C Spider?
No. ANKUSI forges each wheel to your exact target offset, including the flush or max specs above, so you get the correct fitment without stacking spacers. Spacers are typically only used to push out an existing OE-offset wheel without replacing it, which isn't necessary when you're ordering a custom-offset forged wheel.
How do I calculate wheel backspacing for my Alfa Romeo 4C Spider?
Backspacing (in inches) = wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance). For example, the flush spec above works out to roughly 5.88" backspacing up front and 6.43" in the rear.
What's the difference between wheel offset and backspacing?
Offset is the distance in millimeters from the wheel's true centerline to its mounting face (positive offset pulls the wheel in, negative pushes it out). Backspacing is the distance in inches from the mounting face to the back edge of the wheel barrel. They describe the same fitment from two different reference points, which is why ANKUSI lists both above — some shops and tuning guides quote offset, others quote backspacing.
Can I run staggered wheels (different sizes front and rear) on my Alfa Romeo 4C Spider?
Yes — the Alfa Romeo 4C Spider's factory and our recommended flush/max fitments already use staggered sizing (different width front and rear), and ANKUSI can forge matching staggered sets to your target offsets.
Sources and Last Update
Data checked against: avtoreference.com.
This record is part of the open ANKUSI Wheel Fitment Dataset (DOI 10.5281/zenodo.23241521, CC BY 4.0).
Other cars on the same factory size: 17x7 wheels · 17 inch wheels.
Compiled by the ANKUSI Wheels engineering team, an IATF 16949 and ISO 9001 certified forged wheel factory in Guangzhou.