235/85R16 tire size

A 235/85R16 tire is 31.73 inches (805.9 mm) tall, 9.25 in (235 mm) wide and fits a 16-inch wheel. In inch notation it is roughly a 31.7x9.3R16 — a "32-inch" tire.

235/85R16 dimensions
Overall diameter	31.73 in	805.9 mm
Section width	9.25 in	235 mm
Sidewall height	7.86 in	199.8 mm
Circumference	99.68 in	2,532 mm
Revolutions	635.6 per mile	395.0 per km
Rim diameter	16 in	406.4 mm

Compare 235/85R16 with another size

Current size

New size

Speed in mphkm/h

Overall diameter difference

−0.25%

60 mph on the speedometer = 59.9 mph actual

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

Ground clearance: −1.0 mm (−0.04 in)
Revolutions: 636 → 637 per mile

235/85R16 265/75R16

Side-by-side dimensions

	Current	New	Difference	%
Diameter	31.73 in	31.65 in	−0.08 in	−0.25%
Diameter	805.9 mm	803.9 mm	−2.0 mm	−0.25%
Width	9.25 in	10.43 in	+1.18 in	+12.77%
Width	235.0 mm	265.0 mm	+30.0 mm	+12.77%
Sidewall	7.86 in	7.82 in	−0.04 in	−0.50%
Sidewall	199.8 mm	198.8 mm	−1.0 mm	−0.50%
Circumference	99.68 in	99.43 in	−0.25 in	−0.25%
Revs per mile	635.6	637.2	+1.6	+0.25%

Speedometer error

Speedometer shows	Actual speed	Difference
20 mph	20.0 mph	0.0 mph
30 mph	29.9 mph	−0.1 mph
40 mph	39.9 mph	−0.1 mph
50 mph	49.9 mph	−0.1 mph
60 mph	59.9 mph	−0.1 mph
70 mph	69.8 mph	−0.2 mph
80 mph	79.8 mph	−0.2 mph

Alternative sizes on the same 16-inch wheel

Sizes in use within ±3 % of the overall diameter of 235/85R16:

Plus and minus sizes for 235/85R16

Size	Wheel	Diameter	Difference
235/80R17	Plus 1 (17 in)	31.80 in	+0.24%
265/70R17	Plus 1 (17 in)	31.61 in	−0.38%
285/65R17	Plus 1 (17 in)	31.59 in	−0.45%
245/75R17	Plus 1 (17 in)	31.47 in	−0.82%
265/65R18	Plus 2 (18 in)	31.56 in	−0.52%
285/60R18	Plus 2 (18 in)	31.46 in	−0.83%
255/70R18	Plus 2 (18 in)	32.06 in	+1.03%
275/65R18	Plus 2 (18 in)	32.07 in	+1.09%
255/65R19	Plus 3 (19 in)	32.05 in	+1.02%
255/60R19	Plus 3 (19 in)	31.05 in	−2.15%
235/65R19	Plus 3 (19 in)	31.03 in	−2.21%
275/55R19	Plus 3 (19 in)	30.91 in	−2.58%

Vehicles approved with 235/85R16 tires

Models whose Swiss type approval lists 235/85R16 as a standard or optional size (42 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 16-inch sizes

Reading the 235/85R16 size

235 — section width in millimetres (9.25 in).
85 — aspect ratio: the sidewall is 85 % of the width, 199.8 mm.
R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
16 — fits a 16-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.