185/70R15 tire size
A 185/70R15 tire is 25.20 inches (640.0 mm) tall, 7.28 in (185 mm) wide and fits a 15-inch wheel. In inch notation it is roughly a 25.2x7.3R15.
| Overall diameter | 25.20 in | 640.0 mm |
|---|---|---|
| Section width | 7.28 in | 185 mm |
| Sidewall height | 5.10 in | 129.5 mm |
| Circumference | 79.16 in | 2,011 mm |
| Revolutions | 800.4 per mile | 497.4 per km |
| Rim diameter | 15 in | 381.0 mm |
Compare 185/70R15 with another size
Alternative sizes on the same 15-inch wheel
Sizes in use within ±3 % of the overall diameter of 185/70R15:
Plus and minus sizes for 185/70R15
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 205/70R14 | Minus 1 (14 in) | 25.30 in | +0.41% |
| 175/80R14 | Minus 1 (14 in) | 25.02 in | −0.69% |
| 185/75R14 | Minus 1 (14 in) | 24.93 in | −1.08% |
| 195/70R14 | Minus 1 (14 in) | 24.75 in | −1.78% |
| 195/60R16 | Plus 1 (16 in) | 25.21 in | +0.06% |
| 235/50R16 | Plus 1 (16 in) | 25.25 in | +0.22% |
| 215/55R16 | Plus 1 (16 in) | 25.31 in | +0.45% |
| 205/55R16 | Plus 1 (16 in) | 24.88 in | −1.27% |
| 205/50R17 | Plus 2 (17 in) | 25.07 in | −0.50% |
| 235/45R17 | Plus 2 (17 in) | 25.33 in | +0.52% |
| 225/45R17 | Plus 2 (17 in) | 24.97 in | −0.89% |
| 195/55R17 | Plus 2 (17 in) | 25.44 in | +0.98% |
| 205/45R18 | Plus 3 (18 in) | 25.26 in | +0.27% |
| 225/40R18 | Plus 3 (18 in) | 25.09 in | −0.44% |
| 235/40R18 | Plus 3 (18 in) | 25.40 in | +0.81% |
| 215/45R18 | Plus 3 (18 in) | 25.62 in | +1.67% |
Vehicles approved with 185/70R15 tires
Models whose Swiss type approval lists 185/70R15 as a standard or optional size (74 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 185/70R15 size
- 185 — section width in millimetres (7.28 in).
- 70 — aspect ratio: the sidewall is 70 % of the width, 129.5 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.