225/35R18 tire size
A 225/35R18 tire is 24.20 inches (614.7 mm) tall, 8.86 in (225 mm) wide and fits a 18-inch wheel. In inch notation it is roughly a 24.2x8.9R18.
| Overall diameter | 24.20 in | 614.7 mm |
|---|---|---|
| Section width | 8.86 in | 225 mm |
| Sidewall height | 3.10 in | 78.8 mm |
| Circumference | 76.03 in | 1,931 mm |
| Revolutions | 833.4 per mile | 517.8 per km |
| Rim diameter | 18 in | 457.2 mm |
Compare 225/35R18 with another size
Alternative sizes on the same 18-inch wheel
Sizes in use within ±3 % of the overall diameter of 225/35R18:
Plus and minus sizes for 225/35R18
| Size | Wheel | Diameter | Difference |
|---|---|---|---|
| 205/50R16 | Minus 2 (16 in) | 24.07 in | −0.54% |
| 225/45R16 | Minus 2 (16 in) | 23.97 in | −0.94% |
| 195/55R16 | Minus 2 (16 in) | 24.44 in | +1.01% |
| 215/50R16 | Minus 2 (16 in) | 24.46 in | +1.09% |
| 205/45R17 | Minus 1 (17 in) | 24.26 in | +0.26% |
| 265/35R17 | Minus 1 (17 in) | 24.30 in | +0.42% |
| 225/40R17 | Minus 1 (17 in) | 24.09 in | −0.47% |
| 235/40R17 | Minus 1 (17 in) | 24.40 in | +0.83% |
| 245/30R19 | Plus 1 (19 in) | 24.79 in | +2.42% |
Vehicles approved with 225/35R18 tires
Models whose Swiss type approval lists 225/35R18 as a standard or optional size (238 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 18-inch sizes
Reading the 225/35R18 size
- 225 — section width in millimetres (8.86 in).
- 35 — aspect ratio: the sidewall is 35 % of the width, 78.8 mm.
- R — radial construction (ZR on the sidewall means a high-speed rated radial; the dimensions are the same).
- 18 — fits a 18-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.