2026 Cadillac CT5-V Blackwing tire size

Most common factory size

P275/35R19

Tire sizes by trim

Source marks: one source

2026 Cadillac CT5-V Blackwing tire size by trim
Size	Trims	Width, mm	Sidewall, % of width	Rim, in	Diameter, in	Sidewall, in	Revs per mile
P275/35R19	CT5-V V-Series Blackwing RWD	275	35	19	26.58	3.79	759
P245/40R19	CT5-V V-Series AWD	245	40	19	26.72	3.86	755

What P275/35R19 means
Part	Number	Meaning
Type	P	Passenger car tire.
Width	275 mm	Tread width. 10.8 in.
Sidewall	35	Sidewall height is 35% of the width.
Construction	R	Radial tire.
Rim	19 in	Fits 19 in wheels.

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

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

Sizes within 3% of P245/40R19
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
285/30R20	20	26.73	+0.1%	60.0 mph
245/35R20	20	26.75	+0.1%	59.9 mph
245/45R18	18	26.68	-0.1%	60.1 mph
195/50R19	19	26.68	-0.1%	60.1 mph
275/40R18	18	26.66	-0.2%	60.1 mph
275/35R19	19	26.58	-0.5%	60.3 mph
225/50R18	18	26.86	+0.5%	59.7 mph
275/30R20	20	26.50	-0.8%	60.5 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.