2024 Cadillac CT5 tire size

Most common factory size

P255/35R20

Tire sizes by trim

Source marks: one source

2024 Cadillac CT5 tire size by trim
Size	Trims	Width, mm	Sidewall, % of width	Rim, in	Diameter, in	Sidewall, in	Revs per mile
P255/35R20	Luxury RWD, Luxury AWD, Premium Luxury RWD, Sport RWD, Premium Luxury AWD, Sport AWD +2 more	255	35	20	27.03	3.51	746
P275/35R19	V-Series Blackwing RWD	275	35	19	26.58	3.79	759

What P255/35R20 means
Part	Number	Meaning
Type	P	Passenger car tire.
Width	255 mm	Tread width. 10.0 in.
Sidewall	35	Sidewall height is 35% of the width.
Construction	R	Radial tire.
Rim	20 in	Fits 20 in wheels.

Within 3% of the stock diameter. A common shop guideline, not a maker spec.

Sizes within 3% of P255/35R20
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
255/40R19	19	27.03	+0.0%	60.0 mph
225/45R19	19	26.97	-0.2%	60.1 mph
295/35R19	19	27.13	+0.4%	59.8 mph
305/30R20	20	27.20	+0.7%	59.6 mph
245/35R20	20	26.75	-1.0%	60.6 mph
265/35R20	20	27.30	+1.0%	59.4 mph
285/30R20	20	26.73	-1.1%	60.7 mph
235/45R19	19	27.33	+1.1%	59.3 mph

Sizes within 3% of P275/35R19
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
275/30R20	20	26.50	-0.3%	60.2 mph
275/40R18	18	26.66	+0.3%	59.8 mph
195/50R19	19	26.68	+0.4%	59.8 mph
235/35R20	20	26.48	-0.4%	60.2 mph
245/45R18	18	26.68	+0.4%	59.8 mph
215/50R18	18	26.46	-0.4%	60.3 mph
245/40R19	19	26.72	+0.5%	59.7 mph
285/30R20	20	26.73	+0.6%	59.7 mph

Checked against 292 factory sizes listed for 2009-2027 US models.

Tire pressure is on the driver door sticker. Not in this data.

Optional wheel packages may differ.