285/35R21 tire size
A 285/35R21 tire is 28.85 inches (732.9 mm) tall, 11.22 in (285 mm) wide and fits a 21-inch wheel. In inch notation it is roughly a 28.9x11.2R21 — a "29-inch" tire.
| Overall diameter | 28.85 in | 732.9 mm |
|---|---|---|
| Section width | 11.22 in | 285 mm |
| Sidewall height | 3.93 in | 99.8 mm |
| Circumference | 90.65 in | 2,302 mm |
| Revolutions | 699.0 per mile | 434.3 per km |
| Rim diameter | 21 in | 533.4 mm |
Compare 285/35R21 with another size
Alternative sizes on the same 21-inch wheel
Sizes in use within ±3 % of the overall diameter of 285/35R21:
Plus and minus sizes for 285/35R21
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 275/45R19 | Minus 2 (19 in) | 28.74 in | −0.38% |
| 255/50R19 | Minus 2 (19 in) | 29.04 in | +0.64% |
| 285/45R19 | Minus 2 (19 in) | 29.10 in | +0.85% |
| 265/45R19 | Minus 2 (19 in) | 28.39 in | −1.61% |
| 325/35R20 | Minus 1 (20 in) | 28.96 in | +0.35% |
| 285/40R20 | Minus 1 (20 in) | 28.98 in | +0.42% |
| 315/35R20 | Minus 1 (20 in) | 28.68 in | −0.60% |
| 255/45R20 | Minus 1 (20 in) | 29.04 in | +0.63% |
| 295/30R22 | Plus 1 (22 in) | 28.97 in | +0.40% |
| 285/30R22 | Plus 1 (22 in) | 28.73 in | −0.42% |
| 255/35R22 | Plus 1 (22 in) | 29.03 in | +0.60% |
| 305/30R22 | Plus 1 (22 in) | 29.20 in | +1.21% |
Vehicles approved with 285/35R21 tires
Models whose Swiss type approval lists 285/35R21 as a standard or optional size (508 approvals in total). Always check your own vehicle's placard or papers.
- BMW 7 Series
- BMW X5
- BMW X6
- Rolls-Royce Ghost
- BMW i7
- Alfa Romeo Stelvio
- Mercedes-Benz GLC
- Rolls-Royce Wraith
- Rolls-Royce Dawn
- 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 21-inch sizes
- 265/30R21 (−5.5%)
- 265/35R21 (−1.9%)
- 265/40R21 (+1.7%)
- 265/45R21 (+5.3%)
- 275/30R21 (−4.7%)
- 275/35R21 (−1.0%)
- 275/40R21 (+2.8%)
- 275/45R21 (+6.5%)
- 285/30R21 (−3.9%)
- 285/40R21 (+3.9%)
- 285/45R21 (+7.8%)
- 295/25R21 (−7.1%)
- 295/30R21 (−3.1%)
- 295/35R21 (+1.0%)
- 295/40R21 (+5.0%)
- 305/30R21 (−2.3%)
- 305/35R21 (+1.9%)
- 305/40R21 (+6.1%)
Reading the 285/35R21 size
- 285 — section width in millimetres (11.22 in).
- 35 — aspect ratio: the sidewall is 35 % of the width, 99.8 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.