2020 Cadillac CT6 tire and wheel sizes, bolt pattern and tire pressure

Bolt pattern 5x120 on every 2020 trim.

Tires for the 2020 Cadillac CT6

Sizes most trims come with first. Open your trim below for its exact size.

245/45R19 Best-rated standard on 3 trims · optional on 2 · USA, China

Check price on Amazon · 245/45R19
235/50R18 Best-rated standard on 2 trims · USA, China

Check price on Amazon · 235/50R18
245/40R20 Best-rated optional on 5 trims · USA, China

Check price on Amazon · 245/40R20

TireWheelGuide may earn a commission from purchases made through these links.

Trims sold in 2020: 5
Generation: GM Omega II sold in 2 market versions
Other years: 2016
2017
2018
2019
2020
2021
2022
2023
All years (2016–2025)

5 trims sold in 2020

Sold in 2 market versions with different tire sizes. Open a trim for its tire and rim sizes, bolt pattern and tire pressure. Trims with the same tires and wheels share a row.

Cadillac CT6 GM Omega II

2019–2023 5 trims

USA

4 trims

CT6 2.0T 237 hp · 2.0L B20NHT I4 235/50R18 97V 3 fitments

Generation: GM Omega II · 2019–2023
Market: USA
Power: 237 hp
Engine: 2.0L B20NHT I4, Petrol
Center bore: 66.9 mm
Bolt pattern: 5x120
Thread: M14 x 1.5

Check price on Amazon · 235/50R18 Wheels 18x8 ET35 · 5x120 · 66.9 mm on Amazon

Tire size	Rim size and bolt pattern	Pressure, psi
235/50R18 97V	Rim 18x8 ET35 ~~5x120~~	33 psi
245/45R19 98V	Rim 19x8.5 ET33 ~~5x120~~	33 psi
245/40R20 95W	Rim 20x8.5 ET33 ~~5x120~~	36 psi

How to read 97V: 97 is the load index (up to 1,609 lb / 730 kg per tire) and V the speed rating (up to 149 mph / 240 km/h). ET35 is the wheel offset: how far the mounting face sits from the rim centre, in millimetres.

CT6 3.0T +2 variants 404 hp · 3.0L LGW V6 245/45R19 98V 3 fitments

Same tires and wheels on: 3.6i, 4.2T

Generation: GM Omega II · 2019–2023
Market: USA
Power: 404 hp
Engine: 3.0L LGW V6, Petrol
Center bore: 66.9 mm
Bolt pattern: 5x120
Thread: M14 x 1.5

Check price on Amazon · 245/45R19 Wheels 19x8.5 ET33 · 5x120 · 66.9 mm on Amazon

Tire size	Rim size and bolt pattern	Pressure, psi
245/45R19 98V	Rim 19x8.5 ET33 ~~5x120~~	33 psi
245/40R20 95W	Rim 20x8.5 ET33 ~~5x120~~	36 psi
255/35R21 98Y	Rim 21x9 ET30 ~~5x120~~	36 psi

How to read 98V: 98 is the load index (up to 1,653 lb / 750 kg per tire) and V the speed rating (up to 149 mph / 240 km/h). ET33 is the wheel offset: how far the mounting face sits from the rim centre, in millimetres.

China

1 trim

CT6 2.0T 233 hp · 2.0L LSY I4 235/50R18 97V 3 fitments

Generation: GM Omega II · 2019–2023
Market: China
Power: 233 hp
Engine: 2.0L LSY I4, Petrol
Center bore: 66.9 mm
Bolt pattern: 5x120
Thread: M14 x 1.5

Check price on Amazon · 235/50R18 Wheels 18x8 ET35 · 5x120 · 66.9 mm on Amazon

Tire size	Rim size and bolt pattern	Pressure, psi
235/50R18 97V	Rim 18x8 ET35 ~~5x120~~	33 psi
245/45R19 98V	Rim 19x8.5 ET33 ~~5x120~~	33 psi
245/40R20 95W	Rim 20x8.5 ET33 ~~5x120~~	36 psi

What these columns mean

Rim size: Rim diameter × width in inches, and the factory offset (ET) in millimetres, e.g. 18x7.5 ET25.
Bolt pattern (PCD): Number of studs and the diameter of the circle they sit on. It must match exactly.
Center bore: Diameter of the hub hole. Larger aftermarket bores need hub-centric rings.
Pressure: Recommended cold inflation pressure for that axle, in psi.
Thread size: Lug bolt or nut thread — needed when buying aftermarket fasteners.