2026 Kia K4 tire size

Most common factory size

P235/40R18

Tire sizes by trim

Source marks: one source

2026 Kia K4 tire size by trim
Size	Trims	Width, mm	Sidewall, % of width	Rim, in	Diameter, in	Sidewall, in	Revs per mile
P235/40R18	GT-Line FWD, Hatchback GT-Line FWD, GT-Line Turbo FWD, Hatchback GT-Line Turbo FWD	235	40	18	25.40	3.70	794
P205/55R16	LX FWD, LXS FWD	205	55	16	24.88	4.44	811
P225/45R17	EX FWD, Hatchback EX FWD	225	45	17	24.97	3.99	808

What P235/40R18 means
Part	Number	Meaning
Type	P	Passenger car tire.
Width	235 mm	Tread width. 9.3 in.
Sidewall	40	Sidewall height is 40% of the width.
Construction	R	Radial tire.
Rim	18 in	Fits 18 in wheels.

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

Sizes within 3% of P235/40R18
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
215/50R17	17	25.46	+0.2%	59.9 mph
235/35R19	19	25.48	+0.3%	59.8 mph
235/45R17	17	25.33	-0.3%	60.2 mph
205/45R18	18	25.26	-0.5%	60.3 mph
265/30R19	19	25.26	-0.6%	60.3 mph
275/35R18	18	25.58	+0.7%	59.6 mph
225/35R19	19	25.20	-0.8%	60.5 mph
215/45R18	18	25.62	+0.9%	59.5 mph

Sizes within 3% of P205/55R16
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
225/45R17	17	24.97	+0.4%	59.8 mph
195/65R15	15	24.98	+0.4%	59.8 mph
185/60R16	16	24.74	-0.6%	60.3 mph
205/50R17	17	25.07	+0.8%	59.5 mph
205/60R15	15	24.69	-0.8%	60.5 mph
215/45R17	17	24.62	-1.0%	60.6 mph
195/60R16	16	25.21	+1.3%	59.2 mph
185/65R15	15	24.47	-1.6%	61.0 mph

Sizes within 3% of P225/45R17
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
295/30R18	18	24.97	-0.0%	60.0 mph
255/35R18	18	25.03	+0.2%	59.9 mph
205/55R16	16	24.88	-0.4%	60.2 mph
205/50R17	17	25.07	+0.4%	59.8 mph
225/40R18	18	25.09	+0.5%	59.7 mph
215/40R18	18	24.77	-0.8%	60.5 mph
245/35R18	18	24.75	-0.9%	60.5 mph
185/60R16	16	24.74	-0.9%	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.