245/65R18 tire size
A 245/65R18 tire is 30.54 inches (775.7 mm) tall, 9.65 in (245 mm) wide and fits a 18-inch wheel. In inch notation it is roughly a 30.5x9.6R18 — a "31-inch" tire.
| Overall diameter | 30.54 in | 775.7 mm |
|---|---|---|
| Section width | 9.65 in | 245 mm |
| Sidewall height | 6.27 in | 159.3 mm |
| Circumference | 95.94 in | 2,437 mm |
| Revolutions | 660.4 per mile | 410.4 per km |
| Rim diameter | 18 in | 457.2 mm |
Compare 245/65R18 with another size
Alternative sizes on the same 18-inch wheel
Sizes in use within ±3 % of the overall diameter of 245/65R18:
Plus and minus sizes for 245/65R18
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 265/70R16 | Minus 2 (16 in) | 30.61 in | +0.22% |
| 245/75R16 | Minus 2 (16 in) | 30.47 in | −0.23% |
| 235/80R16 | Minus 2 (16 in) | 30.80 in | +0.86% |
| 255/70R16 | Minus 2 (16 in) | 30.06 in | −1.59% |
| 265/65R17 | Minus 1 (17 in) | 30.56 in | +0.08% |
| 245/70R17 | Minus 1 (17 in) | 30.50 in | −0.12% |
| 255/65R17 | Minus 1 (17 in) | 30.05 in | −1.60% |
| 255/70R17 | Minus 1 (17 in) | 31.06 in | +1.69% |
| 265/55R19 | Plus 1 (19 in) | 30.48 in | −0.21% |
| 275/55R19 | Plus 1 (19 in) | 30.91 in | +1.21% |
| 235/60R19 | Plus 1 (19 in) | 30.10 in | −1.43% |
| 235/65R19 | Plus 1 (19 in) | 31.03 in | +1.60% |
| 295/45R20 | Plus 2 (20 in) | 30.45 in | −0.28% |
| 265/50R20 | Plus 2 (20 in) | 30.43 in | −0.35% |
| 275/50R20 | Plus 2 (20 in) | 30.83 in | +0.94% |
| 235/55R20 | Plus 2 (20 in) | 30.18 in | −1.19% |
| 265/45R21 | Plus 3 (21 in) | 30.39 in | −0.49% |
| 275/45R21 | Plus 3 (21 in) | 30.74 in | +0.67% |
| 295/40R21 | Plus 3 (21 in) | 30.29 in | −0.81% |
| 235/50R21 | Plus 3 (21 in) | 30.25 in | −0.94% |
Vehicles approved with 245/65R18 tires
Models whose Swiss type approval lists 245/65R18 as a standard or optional size (3 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 18-inch sizes
Reading the 245/65R18 size
- 245 — section width in millimetres (9.65 in).
- 65 — aspect ratio: the sidewall is 65 % of the width, 159.3 mm.
- R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
- 18 — fits a 18-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.