2026 GMC Sierra EV tire size

Most common factory size

LT265/70R18

Tire sizes by trim

Source marks: one source

2026 GMC Sierra EV tire size by trim
Size	Trims	Width, mm	Sidewall, % of width	Rim, in	Diameter, in	Sidewall, in	Revs per mile
LT265/70R18	Elevation Standard Range 4WD, Elevation Extended Range 4WD	265	70	18	32.61	7.30	619
LT275/50R22	Denali Standard Range 4WD, Denali Extended Range 4WD	275	50	22	32.83	5.41	614
LT285/75R18	AT4 Extended Range 4WD, AT4 Max Range 4WD	285	75	18	34.83	8.42	579
LT275/50R24	Denali Max Range 4WD	275	50	24	34.83	5.41	579

What LT265/70R18 means
Part	Number	Meaning
Type	LT	Light truck tire.
Width	265 mm	Tread width. 10.4 in.
Sidewall	70	Sidewall height is 70% 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 LT265/70R18
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
285/65R18	18	32.59	-0.1%	60.0 mph
285/70R17	17	32.71	+0.3%	59.8 mph
245/75R18	18	32.47	-0.4%	60.3 mph
275/65R18	18	32.07	-1.6%	61.0 mph
255/75R17	17	32.06	-1.7%	61.0 mph
275/70R18	18	33.16	+1.7%	59.0 mph
255/70R18	18	32.06	-1.7%	61.0 mph
255/65R19	19	32.05	-1.7%	61.0 mph

Sizes within 3% of LT275/50R22
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
275/55R21	21	32.91	+0.3%	59.8 mph
265/50R22	22	32.43	-1.2%	60.7 mph
265/55R22	22	33.48	+2.0%	58.8 mph
285/45R22	22	32.10	-2.2%	61.4 mph
285/40R23	23	31.98	-2.6%	61.6 mph

Sizes within 3% of LT285/75R18
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
305/70R18	18	34.81	-0.1%	60.0 mph
325/65R18	18	34.63	-0.6%	60.3 mph
315/70R17	17	34.36	-1.3%	60.8 mph
285/75R17	17	33.83	-2.9%	61.8 mph

No other factory size within 3% of LT275/50R24.

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.