205/70R15 tire size

A 205/70R15 tire is 26.30 inches (668.0 mm) tall, 8.07 in (205 mm) wide and fits a 15-inch wheel. In inch notation it is roughly a 26.3x8.1R15.

205/70R15 dimensions
Overall diameter	26.30 in	668.0 mm
Section width	8.07 in	205 mm
Sidewall height	5.65 in	143.5 mm
Circumference	82.62 in	2,099 mm
Revolutions	766.9 per mile	476.5 per km
Rim diameter	15 in	381.0 mm

Compare 205/70R15 with another size

Current size

New size

Speed in mphkm/h

Overall diameter difference

−1.12%

60 mph on the speedometer = 59.3 mph actual

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

Ground clearance: −3.8 mm (−0.15 in)
Revolutions: 767 → 776 per mile

205/70R15 215/65R15

Side-by-side dimensions

	Current	New	Difference	%
Diameter	26.30 in	26.00 in	−0.30 in	−1.12%
Diameter	668.0 mm	660.5 mm	−7.5 mm	−1.12%
Width	8.07 in	8.46 in	+0.39 in	+4.88%
Width	205.0 mm	215.0 mm	+10.0 mm	+4.88%
Sidewall	5.65 in	5.50 in	−0.15 in	−2.61%
Sidewall	143.5 mm	139.8 mm	−3.8 mm	−2.61%
Circumference	82.62 in	81.69 in	−0.93 in	−1.12%
Revs per mile	766.9	775.6	+8.7	+1.14%

Speedometer error

Speedometer shows	Actual speed	Difference
20 mph	19.8 mph	−0.2 mph
30 mph	29.7 mph	−0.3 mph
40 mph	39.6 mph	−0.4 mph
50 mph	49.4 mph	−0.6 mph
60 mph	59.3 mph	−0.7 mph
70 mph	69.2 mph	−0.8 mph
80 mph	79.1 mph	−0.9 mph

Alternative sizes on the same 15-inch wheel

Sizes in use within ±3 % of the overall diameter of 205/70R15:

Plus and minus sizes for 205/70R15

Size	Wheel	Diameter	Difference
215/60R16	Plus 1 (16 in)	26.16 in	−0.54%
205/65R16	Plus 1 (16 in)	26.49 in	+0.73%
245/55R16	Plus 1 (16 in)	26.61 in	+1.18%
195/65R16	Plus 1 (16 in)	25.98 in	−1.21%
215/55R17	Plus 2 (17 in)	26.31 in	+0.04%
235/50R17	Plus 2 (17 in)	26.25 in	−0.18%
195/60R17	Plus 2 (17 in)	26.21 in	−0.33%
255/45R17	Plus 2 (17 in)	26.04 in	−1.00%
235/45R18	Plus 3 (18 in)	26.33 in	+0.10%
175/60R18	Plus 3 (18 in)	26.27 in	−0.12%
195/55R18	Plus 3 (18 in)	26.44 in	+0.55%
215/50R18	Plus 3 (18 in)	26.46 in	+0.63%

Vehicles approved with 205/70R15 tires

Models whose Swiss type approval lists 205/70R15 as a standard or optional size (112 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 15-inch sizes

Reading the 205/70R15 size

205 — section width in millimetres (8.07 in).
70 — aspect ratio: the sidewall is 70 % of the width, 143.5 mm.
R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
15 — fits a 15-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.