325/30R23 tire size
A 325/30R23 tire is 30.68 inches (779.2 mm) tall, 12.80 in (325 mm) wide and fits a 23-inch wheel. In inch notation it is roughly a 30.7x12.8R23 — a "31-inch" tire.
| Overall diameter | 30.68 in | 779.2 mm |
|---|---|---|
| Section width | 12.80 in | 325 mm |
| Sidewall height | 3.84 in | 97.5 mm |
| Circumference | 96.38 in | 2,448 mm |
| Revolutions | 657.4 per mile | 408.5 per km |
| Rim diameter | 23 in | 584.2 mm |
Compare 325/30R23 with another size
Alternative sizes on the same 23-inch wheel
Sizes in use within ±3 % of the overall diameter of 325/30R23:
Plus and minus sizes for 325/30R23
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 305/40R21 | Minus 2 (21 in) | 30.61 in | −0.23% |
| 315/40R21 | Minus 2 (21 in) | 30.92 in | +0.80% |
| 295/40R21 | Minus 2 (21 in) | 30.29 in | −1.26% |
| 325/40R21 | Minus 2 (21 in) | 31.24 in | +1.82% |
| 315/35R22 | Minus 1 (22 in) | 30.68 in | +0.01% |
| 325/35R22 | Minus 1 (22 in) | 30.96 in | +0.91% |
| 295/35R22 | Minus 1 (22 in) | 30.13 in | −1.78% |
| 295/40R22 | Minus 1 (22 in) | 31.29 in | +2.00% |
Vehicles approved with 325/30R23 tires
Models whose Swiss type approval lists 325/30R23 as a standard or optional size (79 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 325/30R23 size
- 325 — section width in millimetres (12.80 in).
- 30 — aspect ratio: the sidewall is 30 % of the width, 97.5 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.