235/55R17 tire size

A 235/55R17 tire is 27.18 inches (690.3 mm) tall, 9.25 in (235 mm) wide and fits a 17-inch wheel. In inch notation it is roughly a 27.2x9.3R17.

235/55R17 dimensions
Overall diameter	27.18 in	690.3 mm
Section width	9.25 in	235 mm
Sidewall height	5.09 in	129.3 mm
Circumference	85.38 in	2,169 mm
Revolutions	742.1 per mile	461.1 per km
Rim diameter	17 in	431.8 mm

Compare 235/55R17 with another size

Current size

New size

Speed in mphkm/h

Overall diameter difference

−0.07%

60 mph on the speedometer = 60.0 mph actual

Within the ±3 % diameter range most tire fitters accept.

Ground clearance: −0.3 mm (−0.01 in)
Revolutions: 742 → 743 per mile

235/55R17 215/60R17

Side-by-side dimensions

	Current	New	Difference	%
Diameter	27.18 in	27.16 in	−0.02 in	−0.07%
Diameter	690.3 mm	689.8 mm	−0.5 mm	−0.07%
Width	9.25 in	8.46 in	−0.79 in	−8.51%
Width	235.0 mm	215.0 mm	−20.0 mm	−8.51%
Sidewall	5.09 in	5.08 in	−0.01 in	−0.19%
Sidewall	129.3 mm	129.0 mm	−0.3 mm	−0.19%
Circumference	85.38 in	85.32 in	−0.06 in	−0.07%
Revs per mile	742.1	742.6	+0.5	+0.07%

Speedometer error

Speedometer shows	Actual speed	Difference
20 mph	20.0 mph	0.0 mph
30 mph	30.0 mph	0.0 mph
40 mph	40.0 mph	0.0 mph
50 mph	50.0 mph	0.0 mph
60 mph	60.0 mph	0.0 mph
70 mph	69.9 mph	−0.1 mph
80 mph	79.9 mph	−0.1 mph

Alternative sizes on the same 17-inch wheel

Sizes in use within ±3 % of the overall diameter of 235/55R17:

Plus and minus sizes for 235/55R17

Size	Wheel	Diameter	Difference
255/60R15	Minus 2 (15 in)	27.05 in	−0.48%
225/70R15	Minus 2 (15 in)	27.40 in	+0.83%
215/70R15	Minus 2 (15 in)	26.85 in	−1.20%
215/75R15	Minus 2 (15 in)	27.70 in	+1.91%
235/60R16	Minus 1 (16 in)	27.10 in	−0.28%
205/70R16	Minus 1 (16 in)	27.30 in	+0.45%
215/65R16	Minus 1 (16 in)	27.00 in	−0.64%
225/65R16	Minus 1 (16 in)	27.52 in	+1.25%
235/50R18	Plus 1 (18 in)	27.25 in	+0.28%
215/55R18	Plus 1 (18 in)	27.31 in	+0.49%
255/45R18	Plus 1 (18 in)	27.04 in	−0.52%
285/40R18	Plus 1 (18 in)	26.98 in	−0.74%
205/50R19	Plus 2 (19 in)	27.07 in	−0.39%
255/40R19	Plus 2 (19 in)	27.03 in	−0.54%
235/45R19	Plus 2 (19 in)	27.33 in	+0.55%
265/40R19	Plus 2 (19 in)	27.35 in	+0.62%
225/40R20	Plus 3 (20 in)	27.09 in	−0.33%
265/35R20	Plus 3 (20 in)	27.30 in	+0.46%
255/35R20	Plus 3 (20 in)	27.03 in	−0.55%
235/40R20	Plus 3 (20 in)	27.40 in	+0.83%

Vehicles approved with 235/55R17 tires

Models whose Swiss type approval lists 235/55R17 as a standard or optional size (1,693 approvals in total). Always check your own vehicle's placard or papers.

Source: Swiss Federal Roads Office (FEDRO/ASTRA), open government data. Original data (downloaded 2026-09-29). Data processed by us; errors in processing are ours, not the publisher's.

Nearby 17-inch sizes

Reading the 235/55R17 size

235 — section width in millimetres (9.25 in).
55 — aspect ratio: the sidewall is 55 % of the width, 129.3 mm.
R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
17 — fits a 17-inch diameter wheel.

The load index and speed rating (for example 91V) follow the size on the sidewall. They must meet at least the values on your vehicle's tire placard.