255/55R19 tire size

A 255/55R19 tire is 30.04 inches (763.1 mm) tall, 10.04 in (255 mm) wide and fits a 19-inch wheel. In inch notation it is roughly a 30.0x10.0R19 — a "30-inch" tire.

255/55R19 dimensions
Overall diameter	30.04 in	763.1 mm
Section width	10.04 in	255 mm
Sidewall height	5.52 in	140.2 mm
Circumference	94.38 in	2,397 mm
Revolutions	671.3 per mile	417.1 per km
Rim diameter	19 in	482.6 mm

Compare 255/55R19 with another size

Current size

New size

Speed in mphkm/h

Overall diameter difference

+0.20%

60 mph on the speedometer = 60.1 mph actual

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

Ground clearance: +0.8 mm (+0.03 in)
Revolutions: 671 → 670 per mile

255/55R19 235/60R19

Side-by-side dimensions

	Current	New	Difference	%
Diameter	30.04 in	30.10 in	+0.06 in	+0.20%
Diameter	763.1 mm	764.6 mm	+1.5 mm	+0.20%
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	5.52 in	5.55 in	+0.03 in	+0.53%
Sidewall	140.2 mm	141.0 mm	+0.8 mm	+0.53%
Circumference	94.38 in	94.57 in	+0.19 in	+0.20%
Revs per mile	671.3	670.0	−1.3	−0.20%

Speedometer error

Speedometer shows	Actual speed	Difference
20 mph	20.0 mph	0.0 mph
30 mph	30.1 mph	+0.1 mph
40 mph	40.1 mph	+0.1 mph
50 mph	50.1 mph	+0.1 mph
60 mph	60.1 mph	+0.1 mph
70 mph	70.1 mph	+0.1 mph
80 mph	80.2 mph	+0.2 mph

Alternative sizes on the same 19-inch wheel

Sizes in use within ±3 % of the overall diameter of 255/55R19:

Plus and minus sizes for 255/55R19

Size	Wheel	Diameter	Difference
255/65R17	Minus 2 (17 in)	30.05 in	+0.03%
235/70R17	Minus 2 (17 in)	29.95 in	−0.30%
245/70R17	Minus 2 (17 in)	30.50 in	+1.53%
245/65R17	Minus 2 (17 in)	29.54 in	−1.68%
255/60R18	Minus 1 (18 in)	30.05 in	+0.01%
235/65R18	Minus 1 (18 in)	30.03 in	−0.05%
285/55R18	Minus 1 (18 in)	30.34 in	+1.00%
245/60R18	Minus 1 (18 in)	29.57 in	−1.56%
255/50R20	Plus 1 (20 in)	30.04 in	−0.01%
285/45R20	Plus 1 (20 in)	30.10 in	+0.18%
235/55R20	Plus 1 (20 in)	30.18 in	+0.45%
275/45R20	Plus 1 (20 in)	29.74 in	−1.00%
255/45R21	Plus 2 (21 in)	30.04 in	−0.03%
285/40R21	Plus 2 (21 in)	29.98 in	−0.22%
235/50R21	Plus 2 (21 in)	30.25 in	+0.69%
295/40R21	Plus 2 (21 in)	30.29 in	+0.83%
255/40R22	Plus 3 (22 in)	30.03 in	−0.04%
295/35R22	Plus 3 (22 in)	30.13 in	+0.29%
285/35R22	Plus 3 (22 in)	29.85 in	−0.63%
265/40R22	Plus 3 (22 in)	30.35 in	+1.01%

Vehicles approved with 255/55R19 tires

Models whose Swiss type approval lists 255/55R19 as a standard or optional size (1,330 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 19-inch sizes

Reading the 255/55R19 size

255 — section width in millimetres (10.04 in).
55 — aspect ratio: the sidewall is 55 % of the width, 140.2 mm.
R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
19 — fits a 19-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.