245/45R18 tire size
A 245/45R18 tire is 26.68 inches (677.7 mm) tall, 9.65 in (245 mm) wide and fits a 18-inch wheel. In inch notation it is roughly a 26.7x9.6R18.
| Overall diameter | 26.68 in | 677.7 mm |
|---|---|---|
| Section width | 9.65 in | 245 mm |
| Sidewall height | 4.34 in | 110.3 mm |
| Circumference | 83.82 in | 2,129 mm |
| Revolutions | 755.9 per mile | 469.7 per km |
| Rim diameter | 18 in | 457.2 mm |
Compare 245/45R18 with another size
Alternative sizes on the same 18-inch wheel
Sizes in use within ±3 % of the overall diameter of 245/45R18:
Plus and minus sizes for 245/45R18
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 225/60R16 | Minus 2 (16 in) | 26.63 in | −0.19% |
| 245/55R16 | Minus 2 (16 in) | 26.61 in | −0.27% |
| 215/65R16 | Minus 2 (16 in) | 27.00 in | +1.21% |
| 235/60R16 | Minus 2 (16 in) | 27.10 in | +1.58% |
| 245/50R17 | Minus 1 (17 in) | 26.65 in | −0.13% |
| 225/55R17 | Minus 1 (17 in) | 26.74 in | +0.24% |
| 215/55R17 | Minus 1 (17 in) | 26.31 in | −1.39% |
| 235/50R17 | Minus 1 (17 in) | 26.25 in | −1.61% |
| 245/40R19 | Plus 1 (19 in) | 26.72 in | +0.13% |
| 275/35R19 | Plus 1 (19 in) | 26.58 in | −0.38% |
| 285/35R19 | Plus 1 (19 in) | 26.85 in | +0.65% |
| 235/40R19 | Plus 1 (19 in) | 26.40 in | −1.05% |
| 285/30R20 | Plus 2 (20 in) | 26.73 in | +0.19% |
| 245/35R20 | Plus 2 (20 in) | 26.75 in | +0.27% |
| 275/30R20 | Plus 2 (20 in) | 26.50 in | −0.69% |
| 235/35R20 | Plus 2 (20 in) | 26.48 in | −0.77% |
| 295/25R21 | Plus 3 (21 in) | 26.81 in | +0.47% |
| 265/30R21 | Plus 3 (21 in) | 27.26 in | +2.17% |
Vehicles approved with 245/45R18 tires
Models whose Swiss type approval lists 245/45R18 as a standard or optional size (5,470 approvals in total). Always check your own vehicle's placard or papers.
- BMW 5 Series
- Mercedes-Benz E-Class
- Opel Insignia
- Audi A6
- BMW 6 Series
- BMW 4 Series
- Renault Talisman
- Audi A4
- Citroen C5
- BMW 8 Series
- Volkswagen Arteon
- Jaguar XF
- Volvo V90
- Volkswagen Passat
- Volvo S90
- Renault Espace
- Mercedes-Benz Vito
- Mercedes-Benz V-Class
- Cupra Formentor
- Mercedes-Benz CLS
- BMW i4
- Mercedes-Benz S-Class
- Jaguar F-Type
- Mercedes-Benz Viano
- Nissan 370Z
- Opel Astra
- Mercedes-Benz CL
- Saab 9-5
- Peugeot 508
- Renault Vel
- Infiniti G37
- Alpina B5
- Alpina B6
- Citroen C6
- BMW ActiveHybrid
- Jaguar XK
- BMW M5
- Nissan 350Z
- Opel Cascada
- Alpina D5
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
- 225/35R18 (−9.3%)
- 225/40R18 (−6.0%)
- 225/45R18 (−2.7%)
- 225/50R18 (+0.7%)
- 225/55R18 (+4.0%)
- 235/35R18 (−8.3%)
- 235/40R18 (−4.8%)
- 235/45R18 (−1.3%)
- 235/50R18 (+2.1%)
- 235/55R18 (+5.6%)
- 245/35R18 (−7.2%)
- 245/40R18 (−3.6%)
- 245/50R18 (+3.6%)
- 255/35R18 (−6.2%)
- 255/40R18 (−2.4%)
- 255/45R18 (+1.3%)
- 255/50R18 (+5.1%)
- 255/55R18 (+8.9%)
- 265/35R18 (−5.2%)
- 265/40R18 (−1.3%)
- 265/45R18 (+2.7%)
Reading the 245/45R18 size
- 245 — section width in millimetres (9.65 in).
- 45 — aspect ratio: the sidewall is 45 % of the width, 110.3 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.