2024 Mazda CX-90 tire size

Most common factory size

P275/45R21

Tire sizes by trim

Source marks: one source

2024 Mazda CX-90 tire size by trim
Size	Trims	Width, mm	Sidewall, % of width	Rim, in	Diameter, in	Sidewall, in	Revs per mile
P275/45R21	3.3 Turbo Premium AWD, 3.3 Turbo Premium Plus AWD, 3.3 Turbo S AWD, 3.3 Turbo S Premium AWD, PHEV Premium AWD, 3.3 Turbo S Premium Plus AWD +1 more	275	45	21	30.74	4.87	656
P265/55R19	3.3 Turbo Select AWD, 3.3 Turbo Preferred AWD, 3.3 Turbo Preferred Plus AWD, PHEV Preferred AWD	265	55	19	30.48	5.74	662

What P275/45R21 means
Part	Number	Meaning
Type	P	Passenger car tire.
Width	275 mm	Tread width. 10.8 in.
Sidewall	45	Sidewall height is 45% of the width.
Construction	R	Radial tire.
Rim	21 in	Fits 21 in wheels.

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

Sizes within 3% of P275/45R21
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
245/45R22	22	30.68	-0.2%	60.1 mph
275/50R20	20	30.83	+0.3%	59.8 mph
275/40R22	22	30.66	-0.3%	60.2 mph
285/40R22	22	30.98	+0.8%	59.6 mph
255/45R22	22	31.04	+0.9%	59.4 mph
295/45R20	20	30.45	-0.9%	60.6 mph
255/50R21	21	31.04	+1.0%	59.4 mph
255/55R20	20	31.04	+1.0%	59.4 mph

Sizes within 3% of P265/55R19
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
295/45R20	20	30.45	-0.1%	60.0 mph
265/50R20	20	30.43	-0.1%	60.1 mph
265/60R18	18	30.52	+0.1%	59.9 mph
235/55R20	20	30.18	-1.0%	60.6 mph
275/50R20	20	30.83	+1.1%	59.3 mph
235/60R19	19	30.10	-1.2%	60.7 mph
285/45R20	20	30.10	-1.2%	60.8 mph
255/60R18	18	30.05	-1.4%	60.9 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.