255/75R17 tire size

A 255/75R17 tire is 32.06 inches (814.3 mm) tall, 10.04 in (255 mm) wide and fits a 17-inch wheel. In inch notation it is roughly a 32.1x10.0R17 — a "32-inch" tire.

255/75R17 dimensions
Overall diameter	32.06 in	814.3 mm
Section width	10.04 in	255 mm
Sidewall height	7.53 in	191.3 mm
Circumference	100.72 in	2,558 mm
Revolutions	629.1 per mile	390.9 per km
Rim diameter	17 in	431.8 mm

Compare 255/75R17 with another size

Current size

New size

Speed in mphkm/h

Overall diameter difference

−0.80%

60 mph on the speedometer = 59.5 mph actual

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

Ground clearance: −3.3 mm (−0.13 in)
Revolutions: 629 → 634 per mile

255/75R17 235/80R17

Side-by-side dimensions

	Current	New	Difference	%
Diameter	32.06 in	31.80 in	−0.26 in	−0.80%
Diameter	814.3 mm	807.8 mm	−6.5 mm	−0.80%
Width	10.04 in	9.25 in	−0.79 in	−7.84%
Width	255.0 mm	235.0 mm	−20.0 mm	−7.84%
Sidewall	7.53 in	7.40 in	−0.13 in	−1.70%
Sidewall	191.3 mm	188.0 mm	−3.3 mm	−1.70%
Circumference	100.72 in	99.91 in	−0.80 in	−0.80%
Revs per mile	629.1	634.2	+5.1	+0.80%

Speedometer error

Speedometer shows	Actual speed	Difference
20 mph	19.8 mph	−0.2 mph
30 mph	29.8 mph	−0.2 mph
40 mph	39.7 mph	−0.3 mph
50 mph	49.6 mph	−0.4 mph
60 mph	59.5 mph	−0.5 mph
70 mph	69.4 mph	−0.6 mph
80 mph	79.4 mph	−0.6 mph

Alternative sizes on the same 17-inch wheel

Sizes in use within ±3 % of the overall diameter of 255/75R17:

Plus and minus sizes for 255/75R17

Size	Wheel	Diameter	Difference
235/85R16	Minus 1 (16 in)	31.73 in	−1.03%
265/75R16	Minus 1 (16 in)	31.65 in	−1.28%
285/75R16	Minus 1 (16 in)	32.83 in	+2.41%
275/70R16	Minus 1 (16 in)	31.16 in	−2.81%
255/70R18	Plus 1 (18 in)	32.06 in	−0.01%
275/65R18	Plus 1 (18 in)	32.07 in	+0.05%
265/65R18	Plus 1 (18 in)	31.56 in	−1.55%
285/65R18	Plus 1 (18 in)	32.59 in	+1.65%
255/65R19	Plus 2 (19 in)	32.05 in	−0.02%
255/60R20	Plus 3 (20 in)	32.05 in	−0.04%
275/55R20	Plus 3 (20 in)	31.91 in	−0.47%
285/55R20	Plus 3 (20 in)	32.34 in	+0.88%
265/60R20	Plus 3 (20 in)	32.52 in	+1.44%

Vehicles approved with 255/75R17 tires

Models whose Swiss type approval lists 255/75R17 as a standard or optional size (53 approvals in total). Always check your own vehicle's placard or papers.

Jeep Wrangler

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 255/75R17 size

255 — section width in millimetres (10.04 in).
75 — aspect ratio: the sidewall is 75 % of the width, 191.3 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.