2026 Genesis G90 tire size

Most common factory size

P245/40R21

Tire sizes by trim

Source marks: one source

2026 Genesis G90 tire size by trim
Size	Trims	Width, mm	Sidewall, % of width	Rim, in	Diameter, in	Sidewall, in	Revs per mile
P245/40R21	3.5T E-SC MHEV AWD, 3.5T E-SC Prestige Black MHEV AWD	245	40	21	28.72	3.86	702
P245/45R20	3.5T AWD	245	45	20	28.68	4.34	703

What P245/40R21 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	21 in	Fits 21 in wheels.

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

Sizes within 3% of P245/40R21
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
285/30R22	22	28.73	+0.1%	60.0 mph
245/45R20	20	28.68	-0.1%	60.1 mph
275/40R20	20	28.66	-0.2%	60.1 mph
275/35R21	21	28.58	-0.5%	60.3 mph
285/35R21	21	28.85	+0.5%	59.7 mph
325/35R20	20	28.96	+0.8%	59.5 mph
225/45R21	21	28.97	+0.9%	59.5 mph
285/40R20	20	28.98	+0.9%	59.5 mph

Sizes within 3% of P245/45R20
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
275/40R20	20	28.66	-0.1%	60.0 mph
245/40R21	21	28.72	+0.1%	59.9 mph
245/50R19	19	28.65	-0.1%	60.1 mph
225/55R19	19	28.74	+0.2%	59.9 mph
275/45R19	19	28.74	+0.2%	59.9 mph
275/35R21	21	28.58	-0.4%	60.2 mph
285/35R21	21	28.85	+0.6%	59.6 mph
305/35R20	20	28.41	-1.0%	60.6 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.