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2018 Opel Insignia Sports Tourer Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Opel Insignia Sports Tourer wheels? This page gives the 2018 Opel Insignia Sports Tourer bolt pattern (5x115), centre bore, factory rim size and the offset range for aftermarket and forged Opel Insignia Sports Tourer rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 2018 Opel Insignia Sports Tourer uses a 5x115 bolt pattern with a 70.3 mm centre bore and M12x1.5 lug nuts. Factory wheels: 18x8.5J ET41. For aftermarket wheels, 20x9J ET35 sits flush.
Forged wheels for the 2018 Opel Insignia Sports Tourer — drilled 5x115 with a 70.3 mm centre bore, built to the offset you choose. From $220 per wheel, made to order in 20–25 days.
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Opel Insignia Sports Tourer (2018): 5x115 bolt pattern, 70.3mm center bore, OE 18x8.5J ET41. Forged wheel fitment specs from ANKUSI.
Bolt Pattern5x115
Wheel Bolt/NutM12x1.5 Nut
Center Bore70.3mm
Wheel Load Rating700–850 kg/wheel (Performance / Sports Car segment reference)
Year2018
Category5-Lug Performance / Tuner
✓ 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) | 18x8.5J ET41 |
| Flush Fitment | 20x9J at ET35 offset |
Forged Wheel Designs for the Opel Insignia Sports Tourer
Every design below is forged to order, so it can be machined to the Opel Insignia Sports Tourer's 5x115 bolt pattern and 70.3 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
A sedan's wheel spec is a balance point the factory tuned between ride comfort, steering feel, and everyday durability. Forging lets us hold that same structural margin while cutting rotational mass, which is where most of the real-world benefit — quicker steering response, marginally better ride — actually comes from.
The Opel Insignia Sports Tourer ships from the factory on a 5x115 bolt pattern with a 70.3mm center bore and a 18x8.5J ET41 wheel. Our flush reference for the Opel Insignia Sports Tourer is 20x9J ET35.; our maximum aggressive reference is 20x9.5J ET30. — beyond that, expect clearance issues against the fender liner without further modification.
Opel Insignia Sports Tourer OE Wheel Specs
The Opel Insignia Sports Tourer ships from the factory on 5x115 bolt pattern wheels with a 70.3mm center bore. The stock wheel size is 18x8.5J ET41, 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.
ANKUSI builds these wheels — we are the forging factory, not a reseller. For the Opel Insignia Sports Tourer (2018) we drill the 5x115 pattern and cut the centre bore to 70.3mm 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 and Backspacing: Factory Wheel vs Options
Backspacing ≈ width/2 + ET/25.4 + 0.5 in. "Inward" means closer to the suspension; "outward" means closer to the fender lip.
| Setup | Size | ET | Backspacing | Inward vs OE | Outward vs OE |
|---|---|---|---|---|---|
| Factory (OE) | 18x8.5J | ET41 | 6.36 in (162 mm) | — | — |
| Flush | 20x9J | ET35 | 6.38 in (162 mm) | 0 mm | +12 mm |
| Maximum | 20x9.5J | ET30 | 6.43 in (163 mm) | +2 mm | +24 mm |
Vehicles With the Same Hub as the Opel Insignia Sports Tourer (5x115, 70.3 mm Bore)
In our database, 135 other vehicle entries from 9 makes use exactly the same 5x115 bolt pattern and 70.3 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.
5x115 is used by 3.2% of the vehicle pages in our English fitment guide (209 of 6,503); 65.1% of those also use a 70.3 mm center bore.
Hub-Centric Rings for a 70.3 mm Center Bore
A wheel with a center bore larger than 70.3 mm needs a hub-centric ring. The most common combinations:
| Wheel bore | Ring size |
|---|---|
| 70.5 mm | 70.5 → 70.3 mm |
| 71.6 mm | 71.6 → 70.3 mm |
| 72.6 mm | 72.6 → 70.3 mm |
| 73.1 mm | 73.1 → 70.3 mm |
ANKUSI forged wheels are bored to exactly 70.3 mm for this vehicle, so no ring is needed.
Frequently Asked Questions
What bolt pattern (PCD) does the Opel Insignia Sports Tourer use?
The 2018 Opel Insignia Sports Tourer uses a 5x115 bolt pattern.
How many lug bolts does the Opel Insignia Sports Tourer use?
The Opel Insignia Sports Tourer uses a 5-lug bolt pattern (5x115), so you need a 5-lug forged wheel to bolt straight on.
What is the center bore size on the Opel Insignia Sports Tourer?
The Opel Insignia Sports Tourer's center bore is 70.3mm. 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 Opel Insignia Sports Tourer?
Factory wheels on the Opel Insignia Sports Tourer are 18x8.5J ET41.
What does a flush wheel fitment look like on the Opel Insignia Sports Tourer?
For a flush look with minimal to no rubbing, we recommend 20x9J at ET35 offset as a starting point on a stock or mildly lowered Opel Insignia Sports Tourer.
Do I need wheel spacers for my Opel Insignia Sports Tourer?
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 Opel Insignia Sports Tourer?
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 6.38" 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 Opel Insignia Sports Tourer?
The Opel Insignia Sports Tourer 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: 18x8.5 wheels · 18 inch wheels.
Compiled by the ANKUSI Wheels engineering team, an IATF 16949 and ISO 9001 certified forged wheel factory in Guangzhou.