275/45R20 tire size
A 275/45R20 tire is 29.74 inches (755.5 mm) tall, 10.83 in (275 mm) wide and fits a 20-inch wheel. In inch notation it is roughly a 29.7x10.8R20 — a "30-inch" tire.
| Overall diameter | 29.74 in | 755.5 mm |
|---|---|---|
| Section width | 10.83 in | 275 mm |
| Sidewall height | 4.87 in | 123.8 mm |
| Circumference | 93.44 in | 2,373 mm |
| Revolutions | 678.1 per mile | 421.3 per km |
| Rim diameter | 20 in | 508.0 mm |
Compare 275/45R20 with another size
Alternative sizes on the same 20-inch wheel
Sizes in use within ±3 % of the overall diameter of 275/45R20:
Plus and minus sizes for 275/45R20
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 245/60R18 | Minus 2 (18 in) | 29.57 in | −0.57% |
| 255/60R18 | Minus 2 (18 in) | 30.05 in | +1.02% |
| 285/50R18 | Minus 2 (18 in) | 29.22 in | −1.76% |
| 285/55R18 | Minus 2 (18 in) | 30.34 in | +2.01% |
| 275/50R19 | Minus 1 (19 in) | 29.83 in | +0.28% |
| 295/45R19 | Minus 1 (19 in) | 29.45 in | −0.98% |
| 255/55R19 | Minus 1 (19 in) | 30.04 in | +1.01% |
| 265/50R19 | Minus 1 (19 in) | 29.43 in | −1.05% |
| 245/45R21 | Plus 1 (21 in) | 29.68 in | −0.21% |
| 315/35R21 | Plus 1 (21 in) | 29.68 in | −0.21% |
| 275/40R21 | Plus 1 (21 in) | 29.66 in | −0.28% |
| 285/40R21 | Plus 1 (21 in) | 29.98 in | +0.78% |
| 285/35R22 | Plus 2 (22 in) | 29.85 in | +0.37% |
| 275/35R22 | Plus 2 (22 in) | 29.58 in | −0.56% |
| 255/40R22 | Plus 2 (22 in) | 30.03 in | +0.97% |
| 315/30R22 | Plus 2 (22 in) | 29.44 in | −1.02% |
| 315/30R23 | Plus 3 (23 in) | 30.44 in | +2.34% |
| 275/35R23 | Plus 3 (23 in) | 30.58 in | +2.81% |
Vehicles approved with 275/45R20 tires
Models whose Swiss type approval lists 275/45R20 as a standard or optional size (2,536 approvals in total). Always check your own vehicle's placard or papers.
- BMW X5
- BMW X6
- Volvo XC90
- Porsche Cayenne
- Volkswagen Touareg
- Audi Q7
- Tesla Model X
- Mercedes-Benz GL
- Maybach 57
- Maybach 62
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 20-inch sizes
- 255/35R20 (−9.1%)
- 255/40R20 (−5.8%)
- 255/45R20 (−2.4%)
- 255/50R20 (+1.0%)
- 255/55R20 (+4.4%)
- 265/35R20 (−8.2%)
- 265/40R20 (−4.7%)
- 265/45R20 (−1.2%)
- 265/50R20 (+2.3%)
- 275/35R20 (−7.3%)
- 275/40R20 (−3.6%)
- 275/50R20 (+3.6%)
- 275/55R20 (+7.3%)
- 285/35R20 (−6.4%)
- 285/40R20 (−2.6%)
- 285/45R20 (+1.2%)
- 285/50R20 (+5.0%)
- 285/55R20 (+8.7%)
- 295/35R20 (−5.4%)
- 295/40R20 (−1.5%)
- 295/45R20 (+2.4%)
Reading the 275/45R20 size
- 275 — section width in millimetres (10.83 in).
- 45 — aspect ratio: the sidewall is 45 % of the width, 123.8 mm.
- R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
- 20 — fits a 20-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.