Buick OEM-Style Gunmetal Forged Wheels
Monoblock · Gunmetal
2018 Buick Regal GS II Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Buick Regal GS II wheels? This page gives the 2018 Buick Regal GS II bolt pattern (5x115), centre bore, factory rim size and the offset range for aftermarket and forged Buick Regal GS II rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 2018 Buick Regal GS II uses a 5x115 bolt pattern with a 70.3 mm centre bore and M12x1.5 lug nuts. Factory wheels: 19x8.5J, front and rear.
Forged wheels for the 2018 Buick Regal GS II — 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.
Get a quote for this car
Buick Regal GS II (2018): 5x115 bolt pattern, 70.3mm center bore. Factory wheels: 19x8.5J F/R. Flush and max fitment confirmed on request.
Bolt Pattern5x115
Wheel Bolt/NutM12x1.5 Nut
Center Bore70.3mm
Wheel Load Rating650–750 kg/wheel (Standard Passenger Car segment reference)
Caliper TypeFactory caliper package (OEM)
Year2018
CategoryPerformance Sedan
✓ Data check: the bolt pattern and center bore on this page match an independent fitment reference. Last reviewed September 19, 2026. How we verify
Forged Wheel Designs for the Buick Regal GS II
Every design below is forged to order, so it can be machined to the Buick Regal GS II's 5x115 bolt pattern and 70.3 mm center bore, with the width and offset calculated for your setup.
Black / Machined Directional Milled Machined Face Forged Wheels
Monoblock · Black Machined
Vossen LC3-01T-Style Brushed Silver 5-Spoke Forged Wheels
Replica · Brushed Silver
Gray / Gloss Black 2-Piece Directional Forged Wheels
2-Piece · Gray / Gloss Black
Matte Silver Directional Milled Machined Face Forged Wheels
Monoblock · Matte Silver
Custom Finish Machined Face Forged Wheels
Monoblock · Custom Finish
Buick OEM-Style Red 2-Piece Forged Wheels
2-Piece · Red
Buick OEM-Style Silver Multi-Spoke Forged Wheels
Monoblock · Silver
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 big saloon lives or dies on ride quality, and the wheel is the first thing that ruins it. Going wider and lower without watching load rating and offset trades away exactly the composure you paid for. Forging lets you add diameter and width while keeping rotating mass close to the factory figure.
We publish the factory specification for the Buick Regal GS II below. We have not yet been able to verify aftermarket flush or maximum-aggressive offsets for this exact variant against a source we trust, so we are not listing any - an invented offset is worse than no offset when a wheel has to clear a caliper.
Buick Regal GS II OE Wheel Specs
The 2018 Buick Regal GS II (Performance Sedan) uses a 5x115 bolt pattern with a 70.3mm center bore. Factory wheels are 19x8.5J F/R.
Why the factory spec works for most owners:
- Keeps unsprung weight low to preserve the factory handling balance
- Matches the wider, performance-oriented tire sizing typical of this platform
- Maintains clearance for the factory brake package and suspension geometry
- Balances grip with ride comfort for daily and spirited driving
ANKUSI builds these wheels — we are the forging factory, not a reseller. For the Buick Regal GS II (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.
Aftermarket Fitment: Confirmed on Request
Published aftermarket fitment for this exact variant is still thin, so we have not committed to a flush or maximum-aggressive figure. Our engineering team is still collecting verified data for this variant. In the meantime the factory specification above is accurate and is the safe reference point for ordering.
Need a wheel for this car now? Contact ANKUSI with your target diameter, width and offset and our engineers will confirm the correct forged spec against your brake package before anything is cut. You can also use our Offset & Backspacing Calculator to work through the numbers yourself.
Buick Regal GS II: Specs by Model Year
| Year | Bolt pattern | Center bore | Factory wheel |
|---|---|---|---|
| 2018 | 5x115 | 70.3 mm | 19x8.5J |
| 2019 | 5x115 | 70.3 mm | 19x8.5J |
| 2020 | 5x115 | 70.3 mm | 19x8.5J |
| 2021 | 5x115 | 70.3 mm | 19x8.5J |
| 2022 | 5x115 | 70.3 mm | 19x8.5J |
| 2023 | 5x115 | 70.3 mm | 19x8.5J |
Bolt pattern and center bore stay the same across all 6 model years in our database (2018–2023).
Vehicles With the Same Hub as the Buick Regal GS II (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 Buick Regal GS II use?
The 2018 Buick Regal GS II uses a 5x115 bolt pattern.
How many lug bolts does the Buick Regal GS II use?
The Buick Regal GS II 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 Buick Regal GS II?
The Buick Regal GS II'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 Buick Regal GS II?
Factory wheels on the Buick Regal GS II are 19x8.5J F/R.
Do I need wheel spacers for my Buick Regal GS II?
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.
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 Buick Regal GS II?
The Buick Regal GS II 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: 19x8.5 wheels · 19 inch wheels.
Compiled by the ANKUSI Wheels engineering team, an IATF 16949 and ISO 9001 certified forged wheel factory in Guangzhou.