205/55R15 tire size

A 205/55R15 tire is 23.88 inches (606.5 mm) tall, 8.07 in (205 mm) wide and fits a 15-inch wheel. In inch notation it is roughly a 23.9x8.1R15.

205/55R15 dimensions
Overall diameter	23.88 in	606.5 mm
Section width	8.07 in	205 mm
Sidewall height	4.44 in	112.8 mm
Circumference	75.01 in	1,905 mm
Revolutions	844.6 per mile	524.8 per km
Rim diameter	15 in	381.0 mm

Compare 205/55R15 with another size

Current size

New size

Speed in mphkm/h

Overall diameter difference

−0.08%

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: 845 → 845 per mile

205/55R15 225/50R15

Side-by-side dimensions

	Current	New	Difference	%
Diameter	23.88 in	23.86 in	−0.02 in	−0.08%
Diameter	606.5 mm	606.0 mm	−0.5 mm	−0.08%
Width	8.07 in	8.86 in	+0.79 in	+9.76%
Width	205.0 mm	225.0 mm	+20.0 mm	+9.76%
Sidewall	4.44 in	4.43 in	−0.01 in	−0.22%
Sidewall	112.8 mm	112.5 mm	−0.3 mm	−0.22%
Circumference	75.01 in	74.95 in	−0.06 in	−0.08%
Revs per mile	844.6	845.3	+0.7	+0.08%

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 15-inch wheel

Sizes in use within ±3 % of the overall diameter of 205/55R15:

Plus and minus sizes for 205/55R15

Size	Wheel	Diameter	Difference
185/70R13	Minus 2 (13 in)	23.20 in	−2.85%
195/65R14	Minus 1 (14 in)	23.98 in	+0.43%
175/70R14	Minus 1 (14 in)	23.65 in	−0.97%
185/70R14	Minus 1 (14 in)	24.20 in	+1.34%
185/65R14	Minus 1 (14 in)	23.47 in	−1.71%
225/45R16	Plus 1 (16 in)	23.97 in	+0.40%
185/55R16	Plus 1 (16 in)	24.01 in	+0.56%
205/50R16	Plus 1 (16 in)	24.07 in	+0.81%
195/50R16	Plus 1 (16 in)	23.68 in	−0.84%
195/45R17	Plus 2 (17 in)	23.91 in	+0.13%
215/40R17	Plus 2 (17 in)	23.77 in	−0.45%
225/40R17	Plus 2 (17 in)	24.09 in	+0.87%
185/45R17	Plus 2 (17 in)	23.56 in	−1.35%
215/35R18	Plus 3 (18 in)	23.93 in	+0.20%
225/35R18	Plus 3 (18 in)	24.20 in	+1.35%
205/40R18	Plus 3 (18 in)	24.46 in	+2.42%
235/35R18	Plus 3 (18 in)	24.48 in	+2.51%

Vehicles approved with 205/55R15 tires

Models whose Swiss type approval lists 205/55R15 as a standard or optional size (255 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 205/55R15 size

205 — section width in millimetres (8.07 in).
55 — aspect ratio: the sidewall is 55 % of the width, 112.8 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.