175/55R15 tire size

A 175/55R15 tire is 22.58 inches (573.5 mm) tall, 6.89 in (175 mm) wide and fits a 15-inch wheel. In inch notation it is roughly a 22.6x6.9R15.

175/55R15 dimensions
Overall diameter	22.58 in	573.5 mm
Section width	6.89 in	175 mm
Sidewall height	3.79 in	96.3 mm
Circumference	70.93 in	1,802 mm
Revolutions	893.2 per mile	555.0 per km
Rim diameter	15 in	381.0 mm

Compare 175/55R15 with another size

Current size

New size

Speed in mphkm/h

Overall diameter difference

+0.44%

60 mph on the speedometer = 60.3 mph actual

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

Ground clearance: +1.3 mm (+0.05 in)
Revolutions: 893 → 889 per mile

175/55R15 195/50R15

Side-by-side dimensions

	Current	New	Difference	%
Diameter	22.58 in	22.68 in	+0.10 in	+0.44%
Diameter	573.5 mm	576.0 mm	+2.5 mm	+0.44%
Width	6.89 in	7.68 in	+0.79 in	+11.43%
Width	175.0 mm	195.0 mm	+20.0 mm	+11.43%
Sidewall	3.79 in	3.84 in	+0.05 in	+1.30%
Sidewall	96.3 mm	97.5 mm	+1.3 mm	+1.30%
Circumference	70.93 in	71.24 in	+0.31 in	+0.44%
Revs per mile	893.2	889.4	−3.9	−0.43%

Speedometer error

Speedometer shows	Actual speed	Difference
20 mph	20.1 mph	+0.1 mph
30 mph	30.1 mph	+0.1 mph
40 mph	40.2 mph	+0.2 mph
50 mph	50.2 mph	+0.2 mph
60 mph	60.3 mph	+0.3 mph
70 mph	70.3 mph	+0.3 mph
80 mph	80.3 mph	+0.3 mph

Alternative sizes on the same 15-inch wheel

Sizes in use within ±3 % of the overall diameter of 175/55R15:

Plus and minus sizes for 175/55R15

Size	Wheel	Diameter	Difference
175/70R13	Minus 2 (13 in)	22.65 in	+0.30%
205/60R13	Minus 2 (13 in)	22.69 in	+0.47%
155/80R13	Minus 2 (13 in)	22.76 in	+0.82%
215/55R13	Minus 2 (13 in)	22.31 in	−1.19%
155/70R14	Minus 1 (14 in)	22.54 in	−0.16%
165/65R14	Minus 1 (14 in)	22.44 in	−0.59%
185/60R14	Minus 1 (14 in)	22.74 in	+0.71%
175/60R14	Minus 1 (14 in)	22.27 in	−1.38%
215/40R16	Plus 1 (16 in)	22.77 in	+0.85%
175/50R16	Plus 1 (16 in)	22.89 in	+1.38%
195/45R16	Plus 1 (16 in)	22.91 in	+1.46%
195/40R17	Plus 2 (17 in)	23.14 in	+2.49%
225/35R17	Plus 2 (17 in)	23.20 in	+2.76%

Vehicles approved with 175/55R15 tires

Models whose Swiss type approval lists 175/55R15 as a standard or optional size (134 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 15-inch sizes

Reading the 175/55R15 size

175 — section width in millimetres (6.89 in).
55 — aspect ratio: the sidewall is 55 % of the width, 96.3 mm.
R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
15 — fits a 15-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.