275/40R20 tire size
A 275/40R20 tire is 28.66 inches (728.0 mm) tall, 10.83 in (275 mm) wide and fits a 20-inch wheel. In inch notation it is roughly a 28.7x10.8R20 — a "29-inch" tire.
| Overall diameter | 28.66 in | 728.0 mm |
|---|---|---|
| Section width | 10.83 in | 275 mm |
| Sidewall height | 4.33 in | 110.0 mm |
| Circumference | 90.04 in | 2,287 mm |
| Revolutions | 703.7 per mile | 437.2 per km |
| Rim diameter | 20 in | 508.0 mm |
Compare 275/40R20 with another size
Alternative sizes on the same 20-inch wheel
Sizes in use within ±3 % of the overall diameter of 275/40R20:
Plus and minus sizes for 275/40R20
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 255/55R18 | Minus 2 (18 in) | 29.04 in | +1.33% |
| 285/50R18 | Minus 2 (18 in) | 29.22 in | +1.95% |
| 285/45R18 | Minus 2 (18 in) | 28.10 in | −1.96% |
| 255/50R18 | Minus 2 (18 in) | 28.04 in | −2.17% |
| 245/50R19 | Minus 1 (19 in) | 28.65 in | −0.05% |
| 275/45R19 | Minus 1 (19 in) | 28.74 in | +0.29% |
| 265/45R19 | Minus 1 (19 in) | 28.39 in | −0.95% |
| 295/40R19 | Minus 1 (19 in) | 28.29 in | −1.29% |
| 325/30R21 | Plus 1 (21 in) | 28.68 in | +0.05% |
| 245/40R21 | Plus 1 (21 in) | 28.72 in | +0.19% |
| 275/35R21 | Plus 1 (21 in) | 28.58 in | −0.29% |
| 285/35R21 | Plus 1 (21 in) | 28.85 in | +0.67% |
| 285/30R22 | Plus 2 (22 in) | 28.73 in | +0.25% |
| 295/30R22 | Plus 2 (22 in) | 28.97 in | +1.07% |
| 255/35R22 | Plus 2 (22 in) | 29.03 in | +1.28% |
| 305/30R22 | Plus 2 (22 in) | 29.20 in | +1.90% |
Vehicles approved with 275/40R20 tires
Models whose Swiss type approval lists 275/40R20 as a standard or optional size (2,111 approvals in total). Always check your own vehicle's placard or papers.
- BMW X3
- BMW X4
- Porsche Panamera
- BMW X5
- BMW X6
- Bentley Conti
- Land Rover Range Rover Sport
- Lexus LS500H
- Chevrolet Camaro
- Bentley Flying
- BMW iX3
- Bentley Continental
- Porsche Cayenne
- Lexus LC500
- Lexus LC500H
- Volkswagen Touareg
- Bentley Cont
- BMW ActiveHybrid
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
- 255/30R20 (−9.2%)
- 255/35R20 (−5.7%)
- 255/40R20 (−2.2%)
- 255/45R20 (+1.3%)
- 255/50R20 (+4.8%)
- 265/30R20 (−8.4%)
- 265/35R20 (−4.7%)
- 265/40R20 (−1.1%)
- 265/45R20 (+2.5%)
- 265/50R20 (+6.2%)
- 275/30R20 (−7.6%)
- 275/35R20 (−3.8%)
- 275/45R20 (+3.8%)
- 275/50R20 (+7.6%)
- 285/30R20 (−6.7%)
- 285/35R20 (−2.8%)
- 285/40R20 (+1.1%)
- 285/45R20 (+5.0%)
- 285/50R20 (+8.9%)
- 295/30R20 (−5.9%)
- 295/35R20 (−1.9%)
- 295/40R20 (+2.2%)
- 295/45R20 (+6.3%)
Reading the 275/40R20 size
- 275 — section width in millimetres (10.83 in).
- 40 — aspect ratio: the sidewall is 40 % of the width, 110.0 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.