225/50R18 tire size
A 225/50R18 tire is 26.86 inches (682.2 mm) tall, 8.86 in (225 mm) wide and fits a 18-inch wheel. In inch notation it is roughly a 26.9x8.9R18.
| Overall diameter | 26.86 in | 682.2 mm |
|---|---|---|
| Section width | 8.86 in | 225 mm |
| Sidewall height | 4.43 in | 112.5 mm |
| Circumference | 84.38 in | 2,143 mm |
| Revolutions | 750.9 per mile | 466.6 per km |
| Rim diameter | 18 in | 457.2 mm |
Compare 225/50R18 with another size
Alternative sizes on the same 18-inch wheel
Sizes in use within ±3 % of the overall diameter of 225/50R18:
Plus and minus sizes for 225/50R18
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 195/70R16 | Minus 2 (16 in) | 26.75 in | −0.41% |
| 215/65R16 | Minus 2 (16 in) | 27.00 in | +0.54% |
| 225/60R16 | Minus 2 (16 in) | 26.63 in | −0.85% |
| 235/60R16 | Minus 2 (16 in) | 27.10 in | +0.91% |
| 225/55R17 | Minus 1 (17 in) | 26.74 in | −0.43% |
| 205/60R17 | Minus 1 (17 in) | 26.69 in | −0.64% |
| 245/50R17 | Minus 1 (17 in) | 26.65 in | −0.79% |
| 215/60R17 | Minus 1 (17 in) | 27.16 in | +1.11% |
| 225/45R19 | Plus 1 (19 in) | 26.97 in | +0.43% |
| 245/40R19 | Plus 1 (19 in) | 26.72 in | −0.53% |
| 255/40R19 | Plus 1 (19 in) | 27.03 in | +0.64% |
| 195/50R19 | Plus 1 (19 in) | 26.68 in | −0.67% |
| 245/35R20 | Plus 2 (20 in) | 26.75 in | −0.40% |
| 255/35R20 | Plus 2 (20 in) | 27.03 in | +0.63% |
| 225/40R20 | Plus 2 (20 in) | 27.09 in | +0.85% |
| 275/30R20 | Plus 2 (20 in) | 26.50 in | −1.35% |
| 265/30R21 | Plus 3 (21 in) | 27.26 in | +1.50% |
| 275/30R21 | Plus 3 (21 in) | 27.50 in | +2.37% |
Vehicles approved with 225/50R18 tires
Models whose Swiss type approval lists 225/50R18 as a standard or optional size (3,184 approvals in total). Always check your own vehicle's placard or papers.
- BMW 3 Series
- BMW X2
- BMW X1
- BMW 2 Series
- MINI Countryman
- Audi A6
- SEAT Ateca
- Toyota C-HR
- Skoda Karoq
- Cupra Formentor
- Toyota Corolla
- Cupra Ateca
- Nissan 370Z
- Lexus UX250h
- Infiniti Q50
- Audi RS
- SEAT Cupra
- Infiniti G37
- BYD Seal
- Honda HR-V
- Leapmotor B10
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
- 205/40R18 (−8.9%)
- 205/45R18 (−5.9%)
- 205/55R18 (+0.1%)
- 205/60R18 (+3.1%)
- 215/40R18 (−7.8%)
- 215/45R18 (−4.6%)
- 215/50R18 (−1.5%)
- 215/55R18 (+1.7%)
- 215/60R18 (+4.8%)
- 225/40R18 (−6.6%)
- 225/45R18 (−3.3%)
- 225/55R18 (+3.3%)
- 225/60R18 (+6.6%)
- 235/40R18 (−5.4%)
- 235/45R18 (−2.0%)
- 235/50R18 (+1.5%)
- 235/55R18 (+4.9%)
- 235/60R18 (+8.4%)
- 245/40R18 (−4.3%)
- 245/45R18 (−0.7%)
- 245/50R18 (+2.9%)
- 245/60R18 (+10.1%)
Reading the 225/50R18 size
- 225 — section width in millimetres (8.86 in).
- 50 — aspect ratio: the sidewall is 50 % of the width, 112.5 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.