2020 Chevrolet Impala tire size

Most common factory size

P235/50R18

Tire sizes by trim

Source marks: one source

2020 Chevrolet Impala tire size by trim
Size	Trims	Width, mm	Sidewall, % of width	Rim, in	Diameter, in	Sidewall, in	Revs per mile
P235/50R18	LT FWD	235	50	18	27.25	4.63	740
P245/45R19	Premier FWD	245	45	19	27.68	4.34	729

What P235/50R18 means
Part	Number	Meaning
Type	P	Passenger car tire.
Width	235 mm	Tread width. 9.3 in.
Sidewall	50	Sidewall height is 50% 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 P235/50R18
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
215/55R18	18	27.31	+0.2%	59.9 mph
235/55R17	17	27.18	-0.3%	60.2 mph
235/45R19	19	27.33	+0.3%	59.8 mph
215/60R17	17	27.16	-0.3%	60.2 mph
265/40R19	19	27.35	+0.3%	59.8 mph
295/35R19	19	27.13	-0.4%	60.3 mph
255/50R17	17	27.04	-0.8%	60.5 mph
255/45R18	18	27.04	-0.8%	60.5 mph

Sizes within 3% of P245/45R19
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
275/40R19	19	27.66	-0.1%	60.0 mph
245/40R20	20	27.72	+0.1%	59.9 mph
245/50R18	18	27.65	-0.1%	60.1 mph
215/45R20	20	27.62	-0.2%	60.1 mph
225/55R18	18	27.74	+0.2%	59.9 mph
175/55R20	20	27.58	-0.4%	60.2 mph
275/35R20	20	27.58	-0.4%	60.2 mph
155/70R19	19	27.54	-0.5%	60.3 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.