315/35R20 tire size
A 315/35R20 tire is 28.68 inches (728.5 mm) tall, 12.40 in (315 mm) wide and fits a 20-inch wheel. In inch notation it is roughly a 28.7x12.4R20 — a "29-inch" tire.
| Overall diameter | 28.68 in | 728.5 mm |
|---|---|---|
| Section width | 12.40 in | 315 mm |
| Sidewall height | 4.34 in | 110.3 mm |
| Circumference | 90.10 in | 2,289 mm |
| Revolutions | 703.2 per mile | 436.9 per km |
| Rim diameter | 20 in | 508.0 mm |
Compare 315/35R20 with another size
Alternative sizes on the same 20-inch wheel
Sizes in use within ±3 % of the overall diameter of 315/35R20:
Plus and minus sizes for 315/35R20
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 285/50R18 | Minus 2 (18 in) | 29.22 in | +1.88% |
| 285/45R18 | Minus 2 (18 in) | 28.10 in | −2.03% |
| 345/35R19 | Minus 1 (19 in) | 28.51 in | −0.60% |
| 295/40R19 | Minus 1 (19 in) | 28.29 in | −1.36% |
| 285/45R19 | Minus 1 (19 in) | 29.10 in | +1.46% |
| 285/40R19 | Minus 1 (19 in) | 27.98 in | −2.46% |
| 325/30R21 | Plus 1 (21 in) | 28.68 in | −0.01% |
| 285/35R21 | Plus 1 (21 in) | 28.85 in | +0.60% |
| 335/30R21 | Plus 1 (21 in) | 28.91 in | +0.81% |
| 315/30R21 | Plus 1 (21 in) | 28.44 in | −0.84% |
| 285/30R22 | Plus 2 (22 in) | 28.73 in | +0.18% |
| 295/30R22 | Plus 2 (22 in) | 28.97 in | +1.00% |
| 355/25R22 | Plus 2 (22 in) | 28.99 in | +1.07% |
| 305/30R22 | Plus 2 (22 in) | 29.20 in | +1.83% |
Vehicles approved with 315/35R20 tires
Models whose Swiss type approval lists 315/35R20 as a standard or optional size (474 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 20-inch sizes
Reading the 315/35R20 size
- 315 — section width in millimetres (12.40 in).
- 35 — aspect ratio: the sidewall is 35 % of the width, 110.3 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.