What tyre size does a Cadillac STS use?

The most common size is 255/45R18. Depending on generation and engine, the Cadillac STS uses 5 different sizes including 235/50R17, 235/50R18, 255/45R17, 255/45R18, 275/40R19.

Where do I find my exact Cadillac STS tyre size?

Check the tyre placard in the driver's door jamb or fuel flap, or use the lookup tool on this page to select your generation and engine.

Tyres › Cadillac › STS

Cadillac STS tyre sizes

All factory fitments by generation and engine — 5 sizes across 1 generation.

✓ VALIDATED DATASET

Quick answer

The most common tyre size on the Cadillac STS is 255/45R18 (overall diameter ≈ 687 mm). Exact fitment depends on generation and engine — full breakdown below.

STS (GMX295) 2005 - 2011 - Limousine (2005–2011)

Engine	Tyre sizes
STS 3.6 V6 - 257 PS - Benzin - 3564 Hubraum	235/50R17 235/50R18 255/45R17 255/45R18
STS 3.6 V6 - 311 PS - Benzin - 3564 Hubraum	235/50R17 235/50R18 255/45R18
STS 4.6 V8 - 325 PS - Benzin - 4565 Hubraum	235/50R18 255/45R18
STS 5.4 - 476 PS - Benzin - 5368 Hubraum	255/45R18 275/40R19
STS-V 4.4 V8 - 476 PS - Benzin - 4368 Hubraum	255/45R18 275/40R19

Not sure which variant you have?
Use the live finder to drill down to your exact engine and year for your Cadillac STS.
Open the tyre finder →

Run a tyre shop or parts store?
This exact lookup — every vehicle, every size — as a widget on your site, styled to your brand. One line of code, live in 24 hours.
Put this on my site → Try the widget