175/60R18 tire size

A 175/60R18 tire is 26.27 inches (667.2 mm) tall, 6.89 in (175 mm) wide and fits a 18-inch wheel. In inch notation it is roughly a 26.3x6.9R18.

175/60R18 dimensions
Overall diameter	26.27 in	667.2 mm
Section width	6.89 in	175 mm
Sidewall height	4.13 in	105.0 mm
Circumference	82.52 in	2,096 mm
Revolutions	767.8 per mile	477.1 per km
Rim diameter	18 in	457.2 mm

Compare 175/60R18 with another size

Current size

New size

Speed in mphkm/h

Overall diameter difference

+0.67%

60 mph on the speedometer = 60.4 mph actual

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

Ground clearance: +2.3 mm (+0.09 in)
Revolutions: 768 → 763 per mile

175/60R18 195/55R18

Side-by-side dimensions

	Current	New	Difference	%
Diameter	26.27 in	26.44 in	+0.18 in	+0.67%
Diameter	667.2 mm	671.7 mm	+4.5 mm	+0.67%
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	4.13 in	4.22 in	+0.09 in	+2.14%
Sidewall	105.0 mm	107.3 mm	+2.3 mm	+2.14%
Circumference	82.52 in	83.08 in	+0.56 in	+0.67%
Revs per mile	767.8	762.6	−5.1	−0.67%

Speedometer error

Speedometer shows	Actual speed	Difference
20 mph	20.1 mph	+0.1 mph
30 mph	30.2 mph	+0.2 mph
40 mph	40.3 mph	+0.3 mph
50 mph	50.3 mph	+0.3 mph
60 mph	60.4 mph	+0.4 mph
70 mph	70.5 mph	+0.5 mph
80 mph	80.5 mph	+0.5 mph

Alternative sizes on the same 18-inch wheel

Sizes in use within ±3 % of the overall diameter of 175/60R18:

Plus and minus sizes for 175/60R18

Size	Wheel	Diameter	Difference
215/60R16	Minus 2 (16 in)	26.16 in	−0.42%
205/65R16	Minus 2 (16 in)	26.49 in	+0.85%
195/65R16	Minus 2 (16 in)	25.98 in	−1.09%
225/60R16	Minus 2 (16 in)	26.63 in	+1.38%
215/55R17	Minus 1 (17 in)	26.31 in	+0.16%
195/60R17	Minus 1 (17 in)	26.21 in	−0.21%
175/65R17	Minus 1 (17 in)	25.96 in	−1.18%
205/55R17	Minus 1 (17 in)	25.88 in	−1.48%
225/40R19	Plus 1 (19 in)	26.09 in	−0.69%
195/50R19	Plus 1 (19 in)	26.68 in	+1.56%
225/45R19	Plus 1 (19 in)	26.97 in	+2.68%
225/35R20	Plus 2 (20 in)	26.20 in	−0.25%

Vehicles approved with 175/60R18 tires

Models whose Swiss type approval lists 175/60R18 as a standard or optional size (13 approvals in total). Always check your own vehicle's placard or papers.

Toyota Aygo

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 18-inch sizes

Reading the 175/60R18 size

175 — section width in millimetres (6.89 in).
60 — aspect ratio: the sidewall is 60 % of the width, 105.0 mm.
R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
18 — fits a 18-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.