2020 Chevrolet Silverado 1500 tire size

Most common factory size

P275/60R20

Tire sizes by trim

Source marks: one source

2020 Chevrolet Silverado 1500 tire size by trim
Size	Trims	Width, mm	Sidewall, % of width	Rim, in	Diameter, in	Sidewall, in	Revs per mile
P275/60R20	Custom Double Cab RWD, Custom Crew Cab RWD, LT Double Cab RWD, Custom Crew Cab LB RWD, Custom Double Cab 4WD, RST Double Cab RWD +27 more	275	60	20	32.99	6.50	611
P265/70R17	Work Truck Regular Cab RWD, Work Truck Double Cab RWD, Work Truck Regular Cab 4WD, Work Truck Crew Cab RWD, Work Truck Crew Cab LB RWD, Work Truck Double Cab 4WD +2 more	265	70	17	31.61	7.30	638

What P275/60R20 means
Part	Number	Meaning
Type	P	Passenger car tire.
Width	275 mm	Tread width. 10.8 in.
Sidewall	60	Sidewall height is 60% of the width.
Construction	R	Radial tire.
Rim	20 in	Fits 20 in wheels.

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

Sizes within 3% of P275/60R20
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
255/65R20	20	33.05	+0.2%	59.9 mph
275/55R21	21	32.91	-0.3%	60.2 mph
265/60R20	20	32.52	-1.4%	60.9 mph
255/65R19	19	32.05	-2.9%	61.8 mph
255/60R20	20	32.05	-2.9%	61.8 mph

Sizes within 3% of P265/70R17
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
265/65R18	18	31.56	-0.1%	60.1 mph
265/75R16	16	31.65	+0.1%	59.9 mph
245/70R18	18	31.50	-0.3%	60.2 mph
245/75R17	17	31.47	-0.4%	60.3 mph
285/60R18	18	31.46	-0.4%	60.3 mph
235/80R17	17	31.80	+0.6%	59.6 mph
255/70R18	18	32.06	+1.4%	59.2 mph
255/75R17	17	32.06	+1.4%	59.2 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.