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2016 Cadillac CT6 Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Cadillac CT6 wheels? This page gives the 2016 Cadillac CT6 bolt pattern (5x120), centre bore, factory rim size and the offset range for aftermarket and forged Cadillac CT6 rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Quick answer: The 2016 Cadillac CT6 uses a 5x120 bolt pattern with a 66.9 mm centre bore and M12x1.5 lug nuts. Factory wheels: 19x8.5J, front and rear. For aftermarket wheels, 20x9.5J ET28 sits flush and 21x10.0J ET25 is the most aggressive fit.
Forged wheels for the 2016 Cadillac CT6 — drilled 5x120 with a 66.9 mm centre bore, built to the offset you choose. From $220 per wheel, made to order in 20–25 days.
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Cadillac CT6 (2016): 5x120 bolt pattern, 66.9mm center bore. Factory wheels: 19x8.5J F/R. Reference fitment ranges.
Bolt Pattern5x120
Wheel Bolt/NutM12x1.5 Nut
Center Bore66.9mm
Wheel Load Rating650–750 kg/wheel (Standard Passenger Car segment reference)
Year2016
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) | 19x8.5J F/R |
| Flush Fitment | 20x9.5J at ET28 offset |
| Maximum Aggressive | 21x10.0J at ET25 offset |
Forged Wheel Designs for the Cadillac CT6
Every design below is forged to order, so it can be machined to the Cadillac CT6's 5x120 bolt pattern and 66.9 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 Cadillac CT6 runs a 5x120 bolt pattern, 66.9mm center bore, and a 19x8.5J, front and rear, wheel from the factory. Our Flush Fitment reference is 20x9.5J ET28, which tucks the tire under the fender lip on a stock-height Cadillac CT6. Our Maximum Aggressive reference is 21x10.0J ET25 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Cadillac CT6 OE Wheel Specs
The 2016 Cadillac CT6 (Sedan) uses a 5x120 bolt pattern with a 66.9mm center bore. Factory wheels are 19x8.5J 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 Cadillac CT6 (2016) we drill the 5x120 pattern and cut the centre bore to 66.9mm 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: 19x8.5J ET35 → ~6.13″ backspacing
- Flush: 20x9.5J ET28 → ~6.35″ backspacing
- Max: 21x10.0J ET25 → ~6.48″ 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 Cadillac spec, or want a wheel built to a custom offset for your Cadillac CT6? 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 Cadillac CT6 (5x120, 66.9 mm Bore)
In our database, 161 other vehicle entries from 10 makes use exactly the same 5x120 bolt pattern and 66.9 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.
5x120 is used by 10.3% of the vehicle pages in our English fitment guide (670 of 6,503); 24.2% of those also use a 66.9 mm center bore.
Hub-Centric Rings for a 66.9 mm Center Bore
A wheel with a center bore larger than 66.9 mm needs a hub-centric ring. The most common combinations:
| Wheel bore | Ring size |
|---|---|
| 67.1 mm | 67.1 → 66.9 mm |
| 70.1 mm | 70.1 → 66.9 mm |
| 70.5 mm | 70.5 → 66.9 mm |
| 71.6 mm | 71.6 → 66.9 mm |
| 73.1 mm | 73.1 → 66.9 mm |
ANKUSI forged wheels are bored to exactly 66.9 mm for this vehicle, so no ring is needed.
Frequently Asked Questions
What bolt pattern (PCD) does the Cadillac CT6 use?
The 2016 Cadillac CT6 uses a 5x120 bolt pattern.
How many lug bolts does the Cadillac CT6 use?
The Cadillac CT6 uses a 5-lug bolt pattern (5x120), so you need a 5-lug forged wheel to bolt straight on.
What is the center bore size on the Cadillac CT6?
The Cadillac CT6's center bore is 66.9mm. 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 Cadillac CT6?
Factory wheels on the Cadillac CT6 are 19x8.5J F/R.
What is the biggest wheel size I can fit on my Cadillac CT6 without rubbing?
The most aggressive fitment we recommend without fender work is 21x10.0J at ET25 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 Cadillac CT6?
For a flush look with minimal to no rubbing, we recommend 20x9.5J at ET28 offset as a starting point on a stock or mildly lowered Cadillac CT6.
Do I need wheel spacers for my Cadillac CT6?
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 Cadillac CT6?
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 6.35" 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 Cadillac CT6?
The Cadillac CT6 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.