Published by Rims & Tires
Compiled & checked by the site's publisher from manufacturer, NHTSA & USTMA data · Updated 2026-07-24
The Cadillac CT6 was the flagship luxury sedan from 2016 to 2020, competing against the BMW 7 Series and Mercedes-Benz S-Class with a lighter aluminum-intensive structure. Tire choice should match the CT6 character: refined, quiet, capable, with enough performance reserve to honor the optional Blackwing twin-turbo V8 on top trims.
Cadillac CT6 tire sizes by trim
Base CT6 trims used 235/50R18 on 18-inch wheels. Mid trims used 245/45R19 on 19-inch wheels, and Platinum and Sport trims used a square (non-staggered) 245/40R20 on all four corners. The limited-run CT6-V (2019-2020, twin-turbo Blackwing V8) used its own dedicated fitment — verify the exact size on the door jamb sticker rather than assuming.
The CT6 was discontinued after the 2020 model year, and the CT6-V was a limited production run. Always verify your exact size on the driver door sticker.
Best tires for CT6 Base and Luxury: 18-inch
Continental PureContact LS (235/50R18): the top comfort pick for the CT6. Exceptionally quiet, smooth ride quality, strong all-season wet performance, and a 70,000-mile treadwear warranty. An excellent match for the Cadillac luxury character.
Michelin Pilot Sport All Season 4 (235/50R18): the sport pick. Slightly firmer ride than the Continental but noticeably sharper steering feel and better handling response. Best for CT6 owners who drive with purpose.
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Best tires for CT6 Premium, Sport, and Platinum: 19 and 20-inch
Michelin Pilot Sport All Season 4 (245/45R19, 245/40R20): benchmark sport all-season for higher-trim CT6 owners. Outstanding dry and wet performance. Excellent for the CT6 Premium Luxury.
Michelin Pilot Sport 4S (245/40R20): for Sport and Platinum owners wanting maximum summer performance. The benchmark summer tire and a proper match for flagship-trim Cadillac.
Pirelli P Zero All Season Plus (245/45R19): Pirelli's ultra-high-performance all-season. Sport character leaning toward summer with all-weather usability.
Best Tires for the Cadillac CT6 at a glance
| Trim | Tire | Best For |
|---|---|---|
| for CT6 Base and Luxury: 18-inch | Continental PureContact LS (235/50R18) | the top comfort pick for the CT6. Exceptionally quiet, smooth ride quality, strong all-season wet performance, and a 70,000-mile treadwear warranty. An excellent match for the Cadillac luxury character. |
| for CT6 Base and Luxury: 18-inch | Michelin Pilot Sport All Season 4 (235/50R18) | the sport pick. Slightly firmer ride than the Continental but noticeably sharper steering feel and better handling response. Best for CT6 owners who drive with purpose. |
| for CT6 Premium, Sport, and Platinum: 19 and 20-inch | Michelin Pilot Sport All Season 4 (245/45R19, 245/40R20) | benchmark sport all-season for higher-trim CT6 owners. Outstanding dry and wet performance. Excellent for the CT6 Premium Luxury. |
| for CT6 Premium, Sport, and Platinum: 19 and 20-inch | Michelin Pilot Sport 4S (245/40R20) | for Sport and Platinum owners wanting maximum summer performance. The benchmark summer tire and a proper match for flagship-trim Cadillac. |
| for CT6 Premium, Sport, and Platinum: 19 and 20-inch | Pirelli P Zero All Season Plus (245/45R19) | Pirelli's ultra-high-performance all-season. Sport character leaning toward summer with all-weather usability. |
Frequently asked
What tire size does the Cadillac CT6 use?
CT6 18-inch fitment: 235/50R18. 19-inch: 245/45R19. Platinum/Sport 20-inch: 245/40R20 (square, same size all four corners). CT6-V: a low-volume, dedicated fitment — verify on the door jamb sticker.
How much do Cadillac CT6 tires cost?
235/50R18: $130 to $195 per tire. 245/45R19: $155 to $225 per tire. 245/40R20: $175 to $260 per tire. A full set on 18-inch installed runs $520 to $780.
How do I know when my CT6 needs new tires?
Check for tread worn near the wear bars, sidewall cracks, tires older than about six years, or a ride that has gotten noisier and less sure-footed in the rain. A flagship sedan is built to feel planted, and worn tires are usually the first thing to erode that. A quick tread check at a shop will confirm where you stand.
Should I replace all four tires on my CT6 at once?
It depends on the setup. Rear-wheel-drive CT6s can be done in pairs if the other two still have solid tread, with the newer tires on the rear; all-wheel-drive versions do best with all four matched. On the square fitment, replacing all four keeps grip and handling even. When the whole set is worn or aged, four at once is the clean answer.
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Last updated 2026-07-24. General guidance only — confirm specifics with a local shop for your exact vehicle.