315/30R23 tire size
A 315/30R23 tire is 30.44 inches (773.2 mm) tall, 12.40 in (315 mm) wide and fits a 23-inch wheel. In inch notation it is roughly a 30.4x12.4R23 — a "30-inch" tire.
| Overall diameter | 30.44 in | 773.2 mm |
|---|---|---|
| Section width | 12.40 in | 315 mm |
| Sidewall height | 3.72 in | 94.5 mm |
| Circumference | 95.63 in | 2,429 mm |
| Revolutions | 662.5 per mile | 411.7 per km |
| Rim diameter | 23 in | 584.2 mm |
Compare 315/30R23 with another size
Alternative sizes on the same 23-inch wheel
Sizes in use within ±3 % of the overall diameter of 315/30R23:
Plus and minus sizes for 315/30R23
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 295/40R21 | Minus 2 (21 in) | 30.29 in | −0.49% |
| 305/40R21 | Minus 2 (21 in) | 30.61 in | +0.54% |
| 285/40R21 | Minus 2 (21 in) | 29.98 in | −1.53% |
| 315/40R21 | Minus 2 (21 in) | 30.92 in | +1.58% |
| 315/35R22 | Minus 1 (22 in) | 30.68 in | +0.79% |
| 295/35R22 | Minus 1 (22 in) | 30.13 in | −1.02% |
| 325/35R22 | Minus 1 (22 in) | 30.96 in | +1.69% |
| 285/40R22 | Minus 1 (22 in) | 30.98 in | +1.76% |
Vehicles approved with 315/30R23 tires
Models whose Swiss type approval lists 315/30R23 as a standard or optional size (195 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 315/30R23 size
- 315 — section width in millimetres (12.40 in).
- 30 — aspect ratio: the sidewall is 30 % of the width, 94.5 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.