185/75R14 tire size

A 185/75R14 tire is 24.93 inches (633.1 mm) tall, 7.28 in (185 mm) wide and fits a 14-inch wheel. In inch notation it is roughly a 24.9x7.3R14.

185/75R14 dimensions
Overall diameter	24.93 in	633.1 mm
Section width	7.28 in	185 mm
Sidewall height	5.46 in	138.7 mm
Circumference	78.30 in	1,989 mm
Revolutions	809.1 per mile	502.8 per km
Rim diameter	14 in	355.6 mm

Compare 185/75R14 with another size

Current size

New size

Speed in mphkm/h

Overall diameter difference

+0.39%

60 mph on the speedometer = 60.2 mph actual

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

Ground clearance: +1.3 mm (+0.05 in)
Revolutions: 809 → 806 per mile

185/75R14 175/80R14

Side-by-side dimensions

	Current	New	Difference	%
Diameter	24.93 in	25.02 in	+0.10 in	+0.39%
Diameter	633.1 mm	635.6 mm	+2.5 mm	+0.39%
Width	7.28 in	6.89 in	−0.39 in	−5.41%
Width	185.0 mm	175.0 mm	−10.0 mm	−5.41%
Sidewall	5.46 in	5.51 in	+0.05 in	+0.90%
Sidewall	138.7 mm	140.0 mm	+1.3 mm	+0.90%
Circumference	78.30 in	78.61 in	+0.31 in	+0.39%
Revs per mile	809.1	806.0	−3.2	−0.39%

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	60.2 mph	+0.2 mph
70 mph	70.3 mph	+0.3 mph
80 mph	80.3 mph	+0.3 mph

Alternative sizes on the same 14-inch wheel

Sizes in use within ±3 % of the overall diameter of 185/75R14:

Plus and minus sizes for 185/75R14

Size	Wheel	Diameter	Difference
195/65R15	Plus 1 (15 in)	24.98 in	+0.22%
225/55R15	Plus 1 (15 in)	24.74 in	−0.73%
215/60R15	Plus 1 (15 in)	25.16 in	+0.93%
205/60R15	Plus 1 (15 in)	24.69 in	−0.96%
205/55R16	Plus 2 (16 in)	24.88 in	−0.19%
225/50R16	Plus 2 (16 in)	24.86 in	−0.27%
185/60R16	Plus 2 (16 in)	24.74 in	−0.74%
195/60R16	Plus 2 (16 in)	25.21 in	+1.15%
225/45R17	Plus 3 (17 in)	24.97 in	+0.19%
205/50R17	Plus 3 (17 in)	25.07 in	+0.58%
215/45R17	Plus 3 (17 in)	24.62 in	−1.23%
175/55R17	Plus 3 (17 in)	24.58 in	−1.39%

Vehicles approved with 185/75R14 tires

Models whose Swiss type approval lists 185/75R14 as a standard or optional size (15 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 14-inch sizes

Reading the 185/75R14 size

185 — section width in millimetres (7.28 in).
75 — aspect ratio: the sidewall is 75 % of the width, 138.7 mm.
R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
14 — fits a 14-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.