2021 INFINITI Q50 tire size

Most common factory size

P245/40R19

Tire sizes by trim

Source marks: one source

2021 INFINITI Q50 tire size by trim
Size	Trims	Width, mm	Sidewall, % of width	Rim, in	Diameter, in	Sidewall, in	Revs per mile
P245/40R19	SENSORY RWD, Signature Edition RWD, 3.0t SENSORY AWD, Signature Edition AWD, RED SPORT 400 RWD, RED SPORT 400 AWD	245	40	19	26.72	3.86	755
P225/55R17	PURE RWD, 3.0t PURE AWD	225	55	17	26.74	4.87	754
P225/50R18	LUXE RWD, 3.0t LUXE AWD	225	50	18	26.86	4.43	751

What P245/40R19 means
Part	Number	Meaning
Type	P	Passenger car tire.
Width	245 mm	Tread width. 9.6 in.
Sidewall	40	Sidewall height is 40% 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 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

Sizes within 3% of P225/55R17
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
205/60R17	17	26.69	-0.2%	60.1 mph
245/45R18	18	26.68	-0.2%	60.1 mph
275/40R18	18	26.66	-0.3%	60.2 mph
245/50R17	17	26.65	-0.4%	60.2 mph
225/50R18	18	26.86	+0.4%	59.7 mph
225/60R16	16	26.63	-0.4%	60.3 mph
205/65R16	16	26.49	-0.9%	60.6 mph
215/65R16	16	27.00	+1.0%	59.4 mph

Sizes within 3% of P225/50R18
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
225/45R19	19	26.97	+0.4%	59.7 mph
225/55R17	17	26.74	-0.4%	60.3 mph
245/40R19	19	26.72	-0.5%	60.3 mph
205/60R17	17	26.69	-0.6%	60.4 mph
255/40R19	19	27.03	+0.6%	59.6 mph
245/45R18	18	26.68	-0.7%	60.4 mph
255/45R18	18	27.04	+0.7%	59.6 mph
195/50R19	19	26.68	-0.7%	60.4 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.