2025 Porsche Cayenne Coupe tire size

Most common factory size

P255/55R20

Tire sizes by trim

Source marks: one source

2025 Porsche Cayenne Coupe tire size by trim
Size	Trims	Width, mm	Sidewall, % of width	Rim, in	Diameter, in	Sidewall, in	Revs per mile
P255/55R20	AWD, S AWD	255	55	20	31.04	5.52	650
P285/45R21	GTS AWD	285	45	21	31.10	5.05	649

What P255/55R20 means
Part	Number	Meaning
Type	P	Passenger car tire.
Width	255 mm	Tread width. 10.0 in.
Sidewall	55	Sidewall height is 55% 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 P255/55R20
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
255/60R19	19	31.05	+0.0%	60.0 mph
255/50R21	21	31.04	-0.0%	60.0 mph
235/65R19	19	31.03	-0.1%	60.0 mph
285/45R21	21	31.10	+0.2%	59.9 mph
235/60R20	20	31.10	+0.2%	59.9 mph
275/55R19	19	30.91	-0.4%	60.3 mph
285/50R20	20	31.22	+0.6%	59.7 mph
275/50R20	20	30.83	-0.7%	60.4 mph

Sizes within 3% of P285/45R21
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
235/60R20	20	31.10	+0.0%	60.0 mph
255/55R20	20	31.04	-0.2%	60.1 mph
255/50R21	21	31.04	-0.2%	60.1 mph
255/45R22	22	31.04	-0.2%	60.1 mph
285/40R22	22	30.98	-0.4%	60.2 mph
285/50R20	20	31.22	+0.4%	59.8 mph
295/40R22	22	31.29	+0.6%	59.6 mph
275/50R20	20	30.83	-0.9%	60.5 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.