2027 Rolls-Royce Cullinan tire size

Most common factory size

P255/40R23

Tire sizes by trim

Source marks: one source

2027 Rolls-Royce Cullinan tire size by trim
Size	Trims	Width, mm	Sidewall, % of width	Rim, in	Diameter, in	Sidewall, in	Revs per mile
P255/40R23	Black Badge Series II AWD	255	40	23	31.03	4.02	650
P255/40R22	Series II AWD	255	40	22	30.03	4.02	672

What P255/40R23 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	23 in	Fits 23 in wheels.

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

Sizes within 3% of P255/40R23
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
255/45R22	22	31.04	+0.0%	60.0 mph
285/40R22	22	30.98	-0.2%	60.1 mph
285/35R23	23	30.85	-0.6%	60.3 mph
295/40R22	22	31.29	+0.8%	59.5 mph
245/45R22	22	30.68	-1.1%	60.7 mph
275/40R22	22	30.66	-1.2%	60.7 mph
275/35R23	23	30.58	-1.5%	60.9 mph
265/40R22	22	30.35	-2.2%	61.4 mph

Sizes within 3% of P255/40R22
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
255/45R21	21	30.04	+0.0%	60.0 mph
285/40R21	21	29.98	-0.2%	60.1 mph
285/35R22	22	29.85	-0.6%	60.4 mph
235/50R21	21	30.25	+0.7%	59.6 mph
295/40R21	21	30.29	+0.9%	59.5 mph
265/40R22	22	30.35	+1.0%	59.4 mph
245/45R21	21	29.68	-1.2%	60.7 mph
265/45R21	21	30.39	+1.2%	59.3 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.