305/35R23 tire size
A 305/35R23 tire is 31.41 inches (797.7 mm) tall, 12.01 in (305 mm) wide and fits a 23-inch wheel. In inch notation it is roughly a 31.4x12.0R23 — a "31-inch" tire.
| Overall diameter | 31.41 in | 797.7 mm |
|---|---|---|
| Section width | 12.01 in | 305 mm |
| Sidewall height | 4.20 in | 106.8 mm |
| Circumference | 98.66 in | 2,506 mm |
| Revolutions | 642.2 per mile | 399.0 per km |
| Rim diameter | 23 in | 584.2 mm |
Compare 305/35R23 with another size
Alternative sizes on the same 23-inch wheel
Sizes in use within ±3 % of the overall diameter of 305/35R23:
Plus and minus sizes for 305/35R23
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 325/40R21 | Minus 2 (21 in) | 31.24 in | −0.54% |
| 285/45R21 | Minus 2 (21 in) | 31.10 in | −0.98% |
| 275/50R21 | Minus 2 (21 in) | 31.83 in | +1.34% |
| 315/40R21 | Minus 2 (21 in) | 30.92 in | −1.54% |
| 295/40R22 | Minus 1 (22 in) | 31.29 in | −0.36% |
| 305/40R22 | Minus 1 (22 in) | 31.61 in | +0.64% |
| 275/45R22 | Minus 1 (22 in) | 31.74 in | +1.08% |
| 285/40R22 | Minus 1 (22 in) | 30.98 in | −1.37% |
Vehicles approved with 305/35R23 tires
Models whose Swiss type approval lists 305/35R23 as a standard or optional size (5 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 23-inch sizes
Reading the 305/35R23 size
- 305 — section width in millimetres (12.01 in).
- 35 — aspect ratio: the sidewall is 35 % of the width, 106.8 mm.
- R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
- 23 — fits a 23-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.