Opel Insignia GSi Bolt Pattern, Center Bore & Wheel Offset (2018)
Opel Insignia GSi wheel fitment: 5x115 bolt pattern, 70.3mm center bore. OE wheel sizes and offsets for every Insignia GSi variant we cover (2 guides), plus f
- 5x115bolt pattern (PCD)
- 70.3 mmcenter bore
- M12x1.5 Nutwheel bolt / nut
- 2 guidesmodel years 2018
Opel Insignia GSi wheel specs by year and trim
| Year | Model / trim | Bolt pattern | Center bore | OE wheel |
|---|---|---|---|---|
| 2018 | Opel Insignia GSi | 5x115 | 70.3 mm | 20x8.5J ET41 |
| 2018 | Opel Insignia GSi Sports Tourer | 5x115 | 70.3 mm | 20x8.5J ET41 |
Factory wheel sizes on the Opel Insignia GSi
Across the 2 Opel Insignia GSi trims with a documented factory wheel, the OE diameter is 20 inch, width 8.5J and offset ET41. A forged wheel that keeps the 5x115 bolt pattern and the 70.3 mm hub bore and stays inside that offset range bolts on without spacers or hub rings. Going one inch up in diameter with a lower-profile tyre keeps the rolling circumference inside the usual 1.5% tolerance; every extra 0.5J of width moves the outer lip about 6 mm outward at the same offset, and each 5 mm less offset moves the whole wheel 5 mm outward.
Forged wheels for the Opel Insignia GSi (5x115)
Shop all Opel Insignia GSi forged wheels →
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Vehicles With the Same Hub as the Opel Insignia GSi (5x115, 70.3 mm Bore)
In our database, 124 other vehicle entries from 8 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 3.3% of the vehicle entries in our database (209 of 6,396); 65.1% of those also use a 70.3 mm center bore.
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) | 20x8.5J | ET41 | 6.36 in (162 mm) | — | — |
| Flush | 20x9.5J | ET35 | 6.63 in (168 mm) | +7 mm | +19 mm |
| Maximum | 21x9.5J | ET30 | 6.43 in (163 mm) | +2 mm | +24 mm |
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.
Sources and Last Update
Bolt pattern and center bore were checked against at least two independent fitment references before publication.
This record is part of the open ANKUSI Wheel Fitment Dataset (DOI 10.5281/zenodo.23241521, CC BY 4.0).
Compiled by the ANKUSI Wheels engineering team, an IATF 16949 and ISO 9001 certified forged wheel factory in Guangzhou.
FAQ
What is the bolt pattern on a Opel Insignia GSi?
The Opel Insignia GSi uses a 5x115 bolt pattern with a 70.3mm center bore across every Insignia GSi variant in our database (2 guides, 2018).
What is the Opel Insignia GSi center bore?
The hub-centric center bore is 70.3 mm. Aftermarket wheels should match this bore or use hub-centric rings so the hub, not the bolts, carries the load.
Do all Opel Insignia GSi years share the same wheel fitment?
The bolt pattern and center bore are the same across the years we cover, but OE wheel width and offset differ by trim, so check the exact model line before choosing an aftermarket size.
Which forged wheels fit the Opel Insignia GSi?
Any wheel drilled 5x115 with a 70.3mm hub bore in the offset range shown on the model guide. ANKUSI forges wheels to order for this exact specification, in 14–24 inch diameters, so no adapters or hub rings are needed.