245/50R18 tire size
A 245/50R18 tire is 27.65 inches (702.2 mm) tall, 9.65 in (245 mm) wide and fits a 18-inch wheel. In inch notation it is roughly a 27.6x9.6R18 — a "28-inch" tire.
| Overall diameter | 27.65 in | 702.2 mm |
|---|---|---|
| Section width | 9.65 in | 245 mm |
| Sidewall height | 4.82 in | 122.5 mm |
| Circumference | 86.85 in | 2,206 mm |
| Revolutions | 729.5 per mile | 453.3 per km |
| Rim diameter | 18 in | 457.2 mm |
Compare 245/50R18 with another size
Alternative sizes on the same 18-inch wheel
Sizes in use within ±3 % of the overall diameter of 245/50R18:
Plus and minus sizes for 245/50R18
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 245/60R16 | Minus 2 (16 in) | 27.57 in | −0.26% |
| 225/65R16 | Minus 2 (16 in) | 27.52 in | −0.47% |
| 215/70R16 | Minus 2 (16 in) | 27.85 in | +0.74% |
| 235/65R16 | Minus 2 (16 in) | 28.03 in | +1.38% |
| 225/60R17 | Minus 1 (17 in) | 27.63 in | −0.06% |
| 245/55R17 | Minus 1 (17 in) | 27.61 in | −0.13% |
| 215/65R17 | Minus 1 (17 in) | 28.00 in | +1.30% |
| 255/55R17 | Minus 1 (17 in) | 28.04 in | +1.44% |
| 275/40R19 | Plus 1 (19 in) | 27.66 in | +0.06% |
| 245/45R19 | Plus 1 (19 in) | 27.68 in | +0.13% |
| 215/50R19 | Plus 1 (19 in) | 27.46 in | −0.66% |
| 225/50R19 | Plus 1 (19 in) | 27.86 in | +0.77% |
| 215/45R20 | Plus 2 (20 in) | 27.62 in | −0.10% |
| 275/35R20 | Plus 2 (20 in) | 27.58 in | −0.24% |
| 245/40R20 | Plus 2 (20 in) | 27.72 in | +0.26% |
| 285/35R20 | Plus 2 (20 in) | 27.85 in | +0.75% |
| 285/30R21 | Plus 3 (21 in) | 27.73 in | +0.31% |
| 245/35R21 | Plus 3 (21 in) | 27.75 in | +0.38% |
| 275/30R21 | Plus 3 (21 in) | 27.50 in | −0.54% |
| 295/30R21 | Plus 3 (21 in) | 27.97 in | +1.17% |
Vehicles approved with 245/50R18 tires
Models whose Swiss type approval lists 245/50R18 as a standard or optional size (1,114 approvals in total). Always check your own vehicle's placard or papers.
- BMW 7 Series
- Mercedes-Benz S-Class
- BMW 6 Series
- BMW X3
- BMW X4
- Porsche Panamera
- Infiniti Q70
- BMW 5 Series
- Jaguar XJ
- Audi A5
- Alpina B7
- Genesis G80
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
- 225/40R18 (−9.3%)
- 225/45R18 (−6.1%)
- 225/50R18 (−2.8%)
- 225/55R18 (+0.4%)
- 225/60R18 (+3.6%)
- 235/40R18 (−8.1%)
- 235/45R18 (−4.8%)
- 235/50R18 (−1.4%)
- 235/55R18 (+1.9%)
- 235/60R18 (+5.3%)
- 245/40R18 (−7.0%)
- 245/45R18 (−3.5%)
- 245/60R18 (+7.0%)
- 255/40R18 (−5.8%)
- 255/45R18 (−2.2%)
- 255/50R18 (+1.4%)
- 255/55R18 (+5.1%)
- 255/60R18 (+8.7%)
- 265/40R18 (−4.7%)
- 265/45R18 (−0.9%)
- 265/60R18 (+10.4%)
Reading the 245/50R18 size
- 245 — section width in millimetres (9.65 in).
- 50 — aspect ratio: the sidewall is 50 % of the width, 122.5 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.