185/45R17 tire size
A 185/45R17 tire is 23.56 inches (598.3 mm) tall, 7.28 in (185 mm) wide and fits a 17-inch wheel. In inch notation it is roughly a 23.6x7.3R17.
| Overall diameter | 23.56 in | 598.3 mm |
|---|---|---|
| Section width | 7.28 in | 185 mm |
| Sidewall height | 3.28 in | 83.3 mm |
| Circumference | 74.00 in | 1,880 mm |
| Revolutions | 856.2 per mile | 532.0 per km |
| Rim diameter | 17 in | 431.8 mm |
Compare 185/45R17 with another size
Alternative sizes on the same 17-inch wheel
Sizes in use within ±3 % of the overall diameter of 185/45R17:
Plus and minus sizes for 185/45R17
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 215/50R15 | Minus 2 (15 in) | 23.46 in | −0.38% |
| 195/55R15 | Minus 2 (15 in) | 23.44 in | −0.47% |
| 165/65R15 | Minus 2 (15 in) | 23.44 in | −0.47% |
| 185/60R15 | Minus 2 (15 in) | 23.74 in | +0.79% |
| 175/55R16 | Minus 1 (16 in) | 23.58 in | +0.10% |
| 215/45R16 | Minus 1 (16 in) | 23.62 in | +0.27% |
| 195/50R16 | Minus 1 (16 in) | 23.68 in | +0.52% |
| 185/50R16 | Minus 1 (16 in) | 23.28 in | −1.15% |
| 215/35R18 | Plus 1 (18 in) | 23.93 in | +1.57% |
| 225/35R18 | Plus 1 (18 in) | 24.20 in | +2.74% |
Vehicles approved with 185/45R17 tires
Models whose Swiss type approval lists 185/45R17 as a standard or optional size (12 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 17-inch sizes
Reading the 185/45R17 size
- 185 — section width in millimetres (7.28 in).
- 45 — aspect ratio: the sidewall is 45 % of the width, 83.3 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.