275/45R21 tire size
A 275/45R21 tire is 30.74 inches (780.9 mm) tall, 10.83 in (275 mm) wide and fits a 21-inch wheel. In inch notation it is roughly a 30.7x10.8R21 — a "31-inch" tire.
| Overall diameter | 30.74 in | 780.9 mm |
|---|---|---|
| Section width | 10.83 in | 275 mm |
| Sidewall height | 4.87 in | 123.8 mm |
| Circumference | 96.59 in | 2,453 mm |
| Revolutions | 656.0 per mile | 407.6 per km |
| Rim diameter | 21 in | 533.4 mm |
Compare 275/45R21 with another size
Alternative sizes on the same 21-inch wheel
Sizes in use within ±3 % of the overall diameter of 275/45R21:
Plus and minus sizes for 275/45R21
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 275/55R19 | Minus 2 (19 in) | 30.91 in | +0.54% |
| 265/55R19 | Minus 2 (19 in) | 30.48 in | −0.87% |
| 255/60R19 | Minus 2 (19 in) | 31.05 in | +0.99% |
| 255/55R19 | Minus 2 (19 in) | 30.04 in | −2.28% |
| 275/50R20 | Minus 1 (20 in) | 30.83 in | +0.27% |
| 295/45R20 | Minus 1 (20 in) | 30.45 in | −0.95% |
| 255/55R20 | Minus 1 (20 in) | 31.04 in | +0.97% |
| 265/50R20 | Minus 1 (20 in) | 30.43 in | −1.01% |
| 315/35R22 | Plus 1 (22 in) | 30.68 in | −0.20% |
| 275/40R22 | Plus 1 (22 in) | 30.66 in | −0.27% |
| 325/35R22 | Plus 1 (22 in) | 30.96 in | +0.69% |
| 285/40R22 | Plus 1 (22 in) | 30.98 in | +0.76% |
| 325/30R23 | Plus 2 (23 in) | 30.68 in | −0.22% |
| 285/35R23 | Plus 2 (23 in) | 30.85 in | +0.36% |
| 275/35R23 | Plus 2 (23 in) | 30.58 in | −0.54% |
| 255/40R23 | Plus 2 (23 in) | 31.03 in | +0.93% |
Vehicles approved with 275/45R21 tires
Models whose Swiss type approval lists 275/45R21 as a standard or optional size (563 approvals in total). Always check your own vehicle's placard or papers.
- Land Rover Range Rover
- Land Rover Range Rover Sport
- Land Rover Discovery
- Mercedes-Benz GLE
- BMW XM
- Mercedes-Benz GLS
- Jeep GrandCherokee
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 21-inch sizes
Reading the 275/45R21 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).
- 21 — fits a 21-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.