2022 Audi A6 tire size

Most common factory size

P255/40R20

Tire sizes by trim

Source marks: one source

2022 Audi A6 tire size by trim
Size	Trims	Width, mm	Sidewall, % of width	Rim, in	Diameter, in	Sidewall, in	Revs per mile
P255/40R20	45 TFSI Premium AWD, 45 TFSI Premium Plus AWD, 55 TFSI Prestige AWD	255	40	20	28.03	4.02	719
P245/45R20	allroad 55 TFSI Premium Plus AWD, allroad 55 TFSI Prestige AWD	245	45	20	28.68	4.34	703

What P255/40R20 means
Part	Number	Meaning
Type	P	Passenger car tire.
Width	255 mm	Tread width. 10.0 in.
Sidewall	40	Sidewall height is 40% 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 P255/40R20
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
255/35R21	21	28.03	-0.0%	60.0 mph
255/45R19	19	28.04	+0.0%	60.0 mph
225/45R20	20	27.97	-0.2%	60.1 mph
285/35R20	20	27.85	-0.6%	60.4 mph
235/50R19	19	28.25	+0.8%	59.5 mph
265/35R21	21	28.30	+1.0%	59.4 mph
245/35R21	21	27.75	-1.0%	60.6 mph
235/45R20	20	28.33	+1.1%	59.4 mph

Sizes within 3% of P245/45R20
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
275/40R20	20	28.66	-0.1%	60.0 mph
245/40R21	21	28.72	+0.1%	59.9 mph
245/50R19	19	28.65	-0.1%	60.1 mph
225/55R19	19	28.74	+0.2%	59.9 mph
275/45R19	19	28.74	+0.2%	59.9 mph
275/35R21	21	28.58	-0.4%	60.2 mph
285/35R21	21	28.85	+0.6%	59.6 mph
305/35R20	20	28.41	-1.0%	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.