255/40R17 tire size
A 255/40R17 tire is 25.03 inches (635.8 mm) tall, 10.04 in (255 mm) wide and fits a 17-inch wheel. In inch notation it is roughly a 25.0x10.0R17.
| Overall diameter | 25.03 in | 635.8 mm |
|---|---|---|
| Section width | 10.04 in | 255 mm |
| Sidewall height | 4.02 in | 102.0 mm |
| Circumference | 78.64 in | 1,997 mm |
| Revolutions | 805.7 per mile | 500.6 per km |
| Rim diameter | 17 in | 431.8 mm |
Compare 255/40R17 with another size
Alternative sizes on the same 17-inch wheel
Sizes in use within ±3 % of the overall diameter of 255/40R17:
Plus and minus sizes for 255/40R17
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 225/55R15 | Minus 2 (15 in) | 24.74 in | −1.15% |
| 225/60R15 | Minus 2 (15 in) | 25.63 in | +2.39% |
| 225/50R16 | Minus 1 (16 in) | 24.86 in | −0.69% |
| 235/50R16 | Minus 1 (16 in) | 25.25 in | +0.88% |
| 245/45R16 | Minus 1 (16 in) | 24.68 in | −1.40% |
| 245/50R16 | Minus 1 (16 in) | 25.65 in | +2.45% |
| 255/35R18 | Plus 1 (18 in) | 25.03 in | −0.02% |
| 225/40R18 | Plus 1 (18 in) | 25.09 in | +0.22% |
| 295/30R18 | Plus 1 (18 in) | 24.97 in | −0.25% |
| 265/35R18 | Plus 1 (18 in) | 25.30 in | +1.09% |
| 255/30R19 | Plus 2 (19 in) | 25.02 in | −0.03% |
| 225/35R19 | Plus 2 (19 in) | 25.20 in | +0.68% |
| 265/30R19 | Plus 2 (19 in) | 25.26 in | +0.91% |
| 245/30R19 | Plus 2 (19 in) | 24.79 in | −0.98% |
Vehicles approved with 255/40R17 tires
Models whose Swiss type approval lists 255/40R17 as a standard or optional size (527 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 255/40R17 size
- 255 — section width in millimetres (10.04 in).
- 40 — aspect ratio: the sidewall is 40 % of the width, 102.0 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.