2025 Acura MDX tire size

Most common factory size

P255/50R20

Tire sizes by trim

Source marks: one source

2025 Acura MDX tire size by trim
Size	Trims	Width, mm	Sidewall, % of width	Rim, in	Diameter, in	Sidewall, in	Revs per mile
P255/50R20	Base w/Technology Pkg FWD, SH-AWD w/Technology Pkg, SH-AWD w/A-Spec Pkg, SH-AWD w/Advance Pkg	255	50	20	30.04	5.02	671
P255/55R19	FWD, SH-AWD	255	55	19	30.04	5.52	671
P275/40R21	SH-AWD w/A-Spec Advanced Pkg, Type S w/Advance Pkg AWD	275	40	21	29.66	4.33	680

What P255/50R20 means
Part	Number	Meaning
Type	P	Passenger car tire.
Width	255 mm	Tread width. 10.0 in.
Sidewall	50	Sidewall height is 50% 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 P255/50R20
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
255/45R21	21	30.04	-0.0%	60.0 mph
255/55R19	19	30.04	+0.0%	60.0 mph
285/45R20	20	30.10	+0.2%	59.9 mph
235/60R19	19	30.10	+0.2%	59.9 mph
285/40R21	21	29.98	-0.2%	60.1 mph
235/55R20	20	30.18	+0.5%	59.7 mph
275/50R19	19	29.83	-0.7%	60.4 mph
235/50R21	21	30.25	+0.7%	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

Sizes within 3% of P275/40R21
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
245/50R20	20	29.65	-0.1%	60.0 mph
245/45R21	21	29.68	+0.1%	60.0 mph
275/35R22	22	29.58	-0.3%	60.2 mph
275/45R20	20	29.74	+0.3%	59.8 mph
285/35R22	22	29.85	+0.7%	59.6 mph
265/45R20	20	29.39	-0.9%	60.6 mph
265/40R21	21	29.35	-1.1%	60.6 mph
285/40R21	21	29.98	+1.1%	59.4 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.