325/30R20 tire size
A 325/30R20 tire is 27.68 inches (703.0 mm) tall, 12.80 in (325 mm) wide and fits a 20-inch wheel. In inch notation it is roughly a 27.7x12.8R20 — a "28-inch" tire.
| Overall diameter | 27.68 in | 703.0 mm |
|---|---|---|
| Section width | 12.80 in | 325 mm |
| Sidewall height | 3.84 in | 97.5 mm |
| Circumference | 86.95 in | 2,209 mm |
| Revolutions | 728.7 per mile | 452.8 per km |
| Rim diameter | 20 in | 508.0 mm |
Compare 325/30R20 with another size
Alternative sizes on the same 20-inch wheel
Sizes in use within ±3 % of the overall diameter of 325/30R20:
Plus and minus sizes for 325/30R20
Vehicles approved with 325/30R20 tires
Models whose Swiss type approval lists 325/30R20 as a standard or optional size (26 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 325/30R20 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).
- 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.