1998 Alfa Romeo 166 Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Alfa Romeo 166 wheels? This page gives the 1998 Alfa Romeo 166 bolt pattern (5x108), centre bore, factory rim size and the offset range for aftermarket and forged Alfa Romeo 166 rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 1998 Alfa Romeo 166 uses a 5x108 bolt pattern with a 58.1 mm centre bore and M12x1.5 lug nuts. Factory wheels: 15x6.5J, front and rear. For aftermarket wheels, 17x7.5J ET38 sits flush and 18x8.0J ET35 is the most aggressive fit.
Forged wheels for the 1998 Alfa Romeo 166 — drilled 5x108 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 166 (1998): 5x108 bolt pattern, 58.1mm center bore. Factory wheels: 15x6.5J F/R. Reference fitment ranges.
Bolt Pattern5x108
Wheel Bolt/NutM12x1.5 Nut
Center Bore58.1mm
Wheel Load Rating650–750 kg/wheel (Standard Passenger Car segment reference)
Year1998
CategorySedan
✓ 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) | 15x6.5J F/R |
| Flush Fitment | 17x7.5J at ET38 offset |
| Maximum Aggressive | 18x8.0J at ET35 offset |
Forged Wheel Designs for the Alfa Romeo 166
Every design below is forged to order, so it can be machined to the Alfa Romeo 166's 5x108 bolt pattern and 58.1 mm center bore, with the width and offset calculated for your setup.
Transparent Copper Petal Forged Wheels
Monoblock · Transparent Copper
Chrome 5 Y-Split-Spoke Forged Wheels
Monoblock · Chrome
Silver 5 Y-Spoke Mirror Polished Forged Wheels
Monoblock · Silver
Polished 5-Hole Turbine Forged Wheels
Monoblock · Polished
Gloss Black Forged Wheels
Monoblock · Gloss Black
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
The Alfa Romeo 166's factory wheel spec reflects a deliberate balance between comfort, steering feel and durability that the engineering team tuned for. Forging lets ANKUSI match that same strength target while trimming rotational mass — the part of a wheel upgrade that actually changes how the car drives, not just how it looks.
The Alfa Romeo 166 runs a 5x108 bolt pattern, 58.1mm center bore, and a 15x6.5J, front and rear, wheel from the factory. Our Flush Fitment reference is 17x7.5J ET38, which tucks the tire under the fender lip on a stock-height Alfa Romeo 166. Our Maximum Aggressive reference is 18x8.0J ET35 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Alfa Romeo 166 OE Wheel Specs
The 1998 Alfa Romeo 166 (Sedan) uses a 5x108 bolt pattern with a 58.1mm center bore. Factory wheels are 15x6.5J F/R.
Why the factory spec works for most owners:
- Preserves the factory-tuned ride and steering feel
- A mainstream size for this segment, keeping tire choice wide and prices reasonable
- Leaves full clearance for the stock brakes and suspension hardware
- Keeps handling predictable and consistent in everyday conditions
ANKUSI builds these wheels — we are the forging factory, not a reseller. For the Alfa Romeo 166 (1998) we drill the 5x108 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: 15x6.5J ET41 → ~5.36″ backspacing
- Flush: 17x7.5J ET38 → ~5.75″ backspacing
- Max: 18x8.0J ET35 → ~5.88″ 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 166? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.
Alfa Romeo 166: Specs by Model Year
| Year | Bolt pattern | Center bore | Factory wheel |
|---|---|---|---|
| 1998 | 5x108 | 58.1 mm | 15x6.5J |
| 2004 | 5x108 | 58.1 mm | 16x6.5J |
Bolt pattern and center bore stay the same across all 2 model years in our database (1998–2004).
Vehicles With the Same Hub as the Alfa Romeo 166 (5x108, 58.1 mm Bore)
In our database, 3 other Lancia entries use exactly the same 5x108 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.
5x108 is used by 7.7% of the vehicle pages in our English fitment guide (499 of 6,503); 1.0% 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 166 use?
The 1998 Alfa Romeo 166 uses a 5x108 bolt pattern.
How many lug bolts does the Alfa Romeo 166 use?
The Alfa Romeo 166 uses a 5-lug bolt pattern (5x108), so you need a 5-lug forged wheel to bolt straight on.
What is the center bore size on the Alfa Romeo 166?
The Alfa Romeo 166'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 166?
Factory wheels on the Alfa Romeo 166 are 15x6.5J F/R.
What is the biggest wheel size I can fit on my Alfa Romeo 166 without rubbing?
The most aggressive fitment we recommend without fender work is 18x8.0J at ET35 offset. 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 166?
For a flush look with minimal to no rubbing, we recommend 17x7.5J at ET38 offset as a starting point on a stock or mildly lowered Alfa Romeo 166.
Do I need wheel spacers for my Alfa Romeo 166?
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 166?
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 5.75" of backspacing.
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 166?
The Alfa Romeo 166 runs the same wheel size front and rear from the factory, so staggered fitment is not required. ANKUSI can still forge a staggered set (wider rear) on request if you want a more aggressive stance.
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: 15x6.5 wheels · 15 inch wheels.
Compiled by the ANKUSI Wheels engineering team, an IATF 16949 and ISO 9001 certified forged wheel factory in Guangzhou.