2026 Hyundai Ioniq 9 tire size

Most common factory size

P285/45R21

Tire sizes by trim

Source marks: one source

2026 Hyundai Ioniq 9 tire size by trim
Size	Trims	Width, mm	Sidewall, % of width	Rim, in	Diameter, in	Sidewall, in	Revs per mile
P285/45R21	Performance Limited AWD, Performance Calligraphy AWD, Performance Calligraphy Design AWD	285	45	21	31.10	5.05	649
P255/60R19	S RWD, SE AWD	255	60	19	31.05	6.02	650
P275/50R20	SEL AWD	275	50	20	30.83	5.41	654

What P285/45R21 means
Part	Number	Meaning
Type	P	Passenger car tire.
Width	285 mm	Tread width. 11.2 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 P285/45R21
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
235/60R20	20	31.10	+0.0%	60.0 mph
255/55R20	20	31.04	-0.2%	60.1 mph
255/50R21	21	31.04	-0.2%	60.1 mph
255/45R22	22	31.04	-0.2%	60.1 mph
285/40R22	22	30.98	-0.4%	60.2 mph
285/50R20	20	31.22	+0.4%	59.8 mph
295/40R22	22	31.29	+0.6%	59.6 mph
275/50R20	20	30.83	-0.9%	60.5 mph

Sizes within 3% of P255/60R19
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
255/55R20	20	31.04	-0.0%	60.0 mph
255/65R18	18	31.05	+0.0%	60.0 mph
235/65R19	19	31.03	-0.1%	60.0 mph
235/60R20	20	31.10	+0.2%	59.9 mph
275/60R18	18	30.99	-0.2%	60.1 mph
275/55R19	19	30.91	-0.4%	60.3 mph
285/50R20	20	31.22	+0.6%	59.7 mph
275/50R20	20	30.83	-0.7%	60.4 mph

Sizes within 3% of P275/50R20
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
275/45R21	21	30.74	-0.3%	60.2 mph
275/55R19	19	30.91	+0.3%	59.8 mph
235/65R19	19	31.03	+0.7%	59.6 mph
255/50R21	21	31.04	+0.7%	59.6 mph
255/55R20	20	31.04	+0.7%	59.6 mph
255/60R19	19	31.05	+0.7%	59.6 mph
285/45R21	21	31.10	+0.9%	59.5 mph
235/60R20	20	31.10	+0.9%	59.5 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.