2025 Audi Q7 tire size

Most common factory size

P285/45R20

Tire sizes by trim

Source marks: one source

2025 Audi Q7 tire size by trim
Size	Trims	Width, mm	Sidewall, % of width	Rim, in	Diameter, in	Sidewall, in	Revs per mile
P285/45R20	45 TFSI Premium Plus AWD, 55 TFSI Prestige AWD	285	45	20	30.10	5.05	670
P255/55R19	45 TFSI Premium AWD	255	55	19	30.04	5.52	671

What P285/45R20 means
Part	Number	Meaning
Type	P	Passenger car tire.
Width	285 mm	Tread width. 11.2 in.
Sidewall	45	Sidewall height is 45% 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 P285/45R20
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
235/60R19	19	30.10	+0.0%	60.0 mph
255/55R19	19	30.04	-0.2%	60.1 mph
255/50R20	20	30.04	-0.2%	60.1 mph
255/45R21	21	30.04	-0.2%	60.1 mph
235/55R20	20	30.18	+0.3%	59.8 mph
285/40R21	21	29.98	-0.4%	60.2 mph
235/50R21	21	30.25	+0.5%	59.7 mph
295/40R21	21	30.29	+0.6%	59.6 mph

Sizes within 3% of P255/55R19
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
255/60R18	18	30.05	+0.0%	60.0 mph
255/50R20	20	30.04	-0.0%	60.0 mph
235/65R18	18	30.03	-0.1%	60.0 mph
285/45R20	20	30.10	+0.2%	59.9 mph
235/60R19	19	30.10	+0.2%	59.9 mph
235/55R20	20	30.18	+0.4%	59.7 mph
275/55R18	18	29.91	-0.4%	60.3 mph
275/50R19	19	29.83	-0.7%	60.4 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.