275/50R21 tire size
A 275/50R21 tire is 31.83 inches (808.4 mm) tall, 10.83 in (275 mm) wide and fits a 21-inch wheel. In inch notation it is roughly a 31.8x10.8R21 — a "32-inch" tire.
| Overall diameter | 31.83 in | 808.4 mm |
|---|---|---|
| Section width | 10.83 in | 275 mm |
| Sidewall height | 5.41 in | 137.5 mm |
| Circumference | 99.99 in | 2,540 mm |
| Revolutions | 633.7 per mile | 393.8 per km |
| Rim diameter | 21 in | 533.4 mm |
Compare 275/50R21 with another size
Alternative sizes on the same 21-inch wheel
Sizes in use within ±3 % of the overall diameter of 275/50R21:
Plus and minus sizes for 275/50R21
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 255/65R19 | Minus 2 (19 in) | 32.05 in | +0.71% |
| 255/60R19 | Minus 2 (19 in) | 31.05 in | −2.45% |
| 275/55R19 | Minus 2 (19 in) | 30.91 in | −2.88% |
| 275/55R20 | Minus 1 (20 in) | 31.91 in | +0.26% |
| 255/60R20 | Minus 1 (20 in) | 32.05 in | +0.69% |
| 285/55R20 | Minus 1 (20 in) | 32.34 in | +1.62% |
| 285/50R20 | Minus 1 (20 in) | 31.22 in | −1.90% |
| 275/45R22 | Plus 1 (22 in) | 31.74 in | −0.26% |
| 305/40R22 | Plus 1 (22 in) | 31.61 in | −0.69% |
| 285/45R22 | Plus 1 (22 in) | 32.10 in | +0.85% |
| 325/40R22 | Plus 1 (22 in) | 32.24 in | +1.29% |
| 325/35R23 | Plus 2 (23 in) | 31.96 in | +0.41% |
| 285/40R23 | Plus 2 (23 in) | 31.98 in | +0.47% |
| 275/40R23 | Plus 2 (23 in) | 31.66 in | −0.52% |
| 305/35R23 | Plus 2 (23 in) | 31.41 in | −1.32% |
Vehicles approved with 275/50R21 tires
Models whose Swiss type approval lists 275/50R21 as a standard or optional size (201 approvals in total). Always check your own vehicle's placard or papers.
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 275/50R21 size
- 275 — section width in millimetres (10.83 in).
- 50 — aspect ratio: the sidewall is 50 % of the width, 137.5 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.