2024 Porsche 718 Boxster tire size

Most common factory size

P235/35R20

Tire sizes by trim

Source marks: one source

2024 Porsche 718 Boxster tire size by trim
Size	Trims	Width, mm	Sidewall, % of width	Rim, in	Diameter, in	Sidewall, in	Revs per mile
P235/35R20	Style Edition RWD, GTS 4.0 RWD	235	35	20	26.48	3.24	762
P235/45R18	RWD	235	45	18	26.33	4.16	766
P235/40R19	S RWD	235	40	19	26.40	3.70	764

What P235/35R20 means
Part	Number	Meaning
Type	P	Passenger car tire.
Width	235 mm	Tread width. 9.3 in.
Sidewall	35	Sidewall height is 35% 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 P235/35R20
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
275/30R20	20	26.50	+0.1%	60.0 mph
235/40R19	19	26.40	-0.3%	60.2 mph
275/35R19	19	26.58	+0.4%	59.8 mph
265/35R19	19	26.30	-0.7%	60.4 mph
195/50R19	19	26.68	+0.8%	59.5 mph
265/30R20	20	26.26	-0.8%	60.5 mph
245/40R19	19	26.72	+0.9%	59.5 mph
285/30R20	20	26.73	+1.0%	59.4 mph

Sizes within 3% of P235/45R18
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
215/55R17	17	26.31	-0.1%	60.0 mph
265/35R19	19	26.30	-0.1%	60.1 mph
235/40R19	19	26.40	+0.3%	59.8 mph
235/50R17	17	26.25	-0.3%	60.2 mph
195/60R17	17	26.21	-0.4%	60.3 mph
305/30R19	19	26.20	-0.5%	60.3 mph
215/50R18	18	26.46	+0.5%	59.7 mph
225/40R19	19	26.09	-0.9%	60.6 mph

Sizes within 3% of P235/40R19
Size	Rim, in	Diameter, in	Change	Speedo reads at 60 mph
215/50R18	18	26.46	+0.2%	59.9 mph
235/35R20	20	26.48	+0.3%	59.8 mph
235/45R18	18	26.33	-0.3%	60.2 mph
275/30R20	20	26.50	+0.4%	59.8 mph
265/35R19	19	26.30	-0.4%	60.2 mph
265/30R20	20	26.26	-0.5%	60.3 mph
275/35R19	19	26.58	+0.7%	59.6 mph
305/30R19	19	26.20	-0.7%	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.