235/45R18 tire size
A 235/45R18 tire is 26.33 inches (668.7 mm) tall, 9.25 in (235 mm) wide and fits a 18-inch wheel. In inch notation it is roughly a 26.3x9.3R18.
| Overall diameter | 26.33 in | 668.7 mm |
|---|---|---|
| Section width | 9.25 in | 235 mm |
| Sidewall height | 4.16 in | 105.8 mm |
| Circumference | 82.71 in | 2,101 mm |
| Revolutions | 766.1 per mile | 476.0 per km |
| Rim diameter | 18 in | 457.2 mm |
Compare 235/45R18 with another size
Alternative sizes on the same 18-inch wheel
Sizes in use within ±3 % of the overall diameter of 235/45R18:
Plus and minus sizes for 235/45R18
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 205/65R16 | Minus 2 (16 in) | 26.49 in | +0.63% |
| 215/60R16 | Minus 2 (16 in) | 26.16 in | −0.64% |
| 245/55R16 | Minus 2 (16 in) | 26.61 in | +1.08% |
| 225/60R16 | Minus 2 (16 in) | 26.63 in | +1.15% |
| 215/55R17 | Minus 1 (17 in) | 26.31 in | −0.06% |
| 235/50R17 | Minus 1 (17 in) | 26.25 in | −0.28% |
| 255/45R17 | Minus 1 (17 in) | 26.04 in | −1.11% |
| 245/50R17 | Minus 1 (17 in) | 26.65 in | +1.21% |
| 265/35R19 | Plus 1 (19 in) | 26.30 in | −0.09% |
| 235/40R19 | Plus 1 (19 in) | 26.40 in | +0.28% |
| 225/40R19 | Plus 1 (19 in) | 26.09 in | −0.91% |
| 275/35R19 | Plus 1 (19 in) | 26.58 in | +0.96% |
| 265/30R20 | Plus 2 (20 in) | 26.26 in | −0.25% |
| 225/35R20 | Plus 2 (20 in) | 26.20 in | −0.48% |
| 235/35R20 | Plus 2 (20 in) | 26.48 in | +0.57% |
| 275/30R20 | Plus 2 (20 in) | 26.50 in | +0.64% |
Vehicles approved with 235/45R18 tires
Models whose Swiss type approval lists 235/45R18 as a standard or optional size (3,187 approvals in total). Always check your own vehicle's placard or papers.
- Volkswagen Passat
- Opel Insignia
- Peugeot 508
- Skoda Superb
- Ford Mondeo
- Volvo V60
- Volkswagen Beetle
- Opel Zafira
- Ford S-MAX
- Opel Astra
- Ford Galaxy
- Kia XCeed
- Peugeot 3008
- Volvo S60
- Alfa Romeo 159SW
- Alfa Romeo 159
- Tesla Model 3
- Hyundai Kona
- Citroen DS5
- Saab 9-3
- Peugeot 407
- Peugeot RCZ
- Porsche 718
- MG MG4
- Chevrolet Orlando
- Saab 9-5
- Alfa Romeo Brera
- Audi Q2
- Alfa Romeo Spider
- Honda Accord
- Toyota Camry
- Audi SQ2
- Saab 9-3X
- Suzuki Kizashi
- Lexus RC300H
- Porsche Boxster
- Kia Soul
- Kia Optima
- Lexus GS450H
- Lexus GS300H
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
- 215/35R18 (−9.1%)
- 215/40R18 (−5.9%)
- 215/45R18 (−2.7%)
- 215/50R18 (+0.5%)
- 215/55R18 (+3.7%)
- 225/35R18 (−8.1%)
- 225/40R18 (−4.7%)
- 225/45R18 (−1.3%)
- 225/50R18 (+2.0%)
- 225/55R18 (+5.4%)
- 235/35R18 (−7.0%)
- 235/40R18 (−3.5%)
- 235/50R18 (+3.5%)
- 235/55R18 (+7.0%)
- 245/35R18 (−6.0%)
- 245/40R18 (−2.3%)
- 245/45R18 (+1.3%)
- 245/50R18 (+5.0%)
- 255/35R18 (−4.9%)
- 255/40R18 (−1.1%)
- 255/45R18 (+2.7%)
- 255/50R18 (+6.5%)
- 255/55R18 (+10.3%)
Reading the 235/45R18 size
- 235 — section width in millimetres (9.25 in).
- 45 — aspect ratio: the sidewall is 45 % of the width, 105.8 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.