HomeTire size chart18 in wheels
18 inch tire size chart
31 18 inch tire sizes from the catalogue, shortest to tallest: 25.09 in to 37.00 in by calculated diameter.
These are size-code figures only. Whether a size fits, clears and carries your load depends on your vehicle and the tire, so check with a tire shop.
Swipe the table sideways to see every column.
| Size | Diameter | Width | Sidewall | Revs | Class |
|---|---|---|---|---|---|
| 225/40R18 | 25.09637.2 | 8.86225 | 3.5490.0 | 804500 | 25 |
| 235/45R18 | 26.33668.7 | 9.25235 | 4.16105.8 | 766476 | 26 |
| 225/50R18 | 26.86682.2 | 8.86225 | 4.43112.5 | 751467 | 27 |
| 235/50R18 | 27.25692.2 | 9.25235 | 4.63117.5 | 740460 | 27 |
| 225/55R18 | 27.74704.7 | 8.86225 | 4.87123.8 | 727452 | 28 |
| 235/55R18 | 28.18715.7 | 9.25235 | 5.09129.3 | 716445 | 28 |
| 225/60R18 | 28.63727.2 | 8.86225 | 5.31135.0 | 704438 | 29 |
| 235/60R18 | 29.10739.2 | 9.25235 | 5.55141.0 | 693431 | 29 |
| 245/60R18 | 29.57751.2 | 9.65245 | 5.79147.0 | 682424 | 30 |
| 235/65R18 | 30.03762.7 | 9.25235 | 6.01152.8 | 672417 | 30 |
| 255/60R18 | 30.05763.2 | 10.04255 | 6.02153.0 | 671417 | 30 |
| 265/60R18 | 30.52775.2 | 10.43265 | 6.26159.0 | 661411 | 31 |
| 285/60R18 | 31.46799.2 | 11.22285 | 6.73171.0 | 641398 | 31 |
| 265/65R18 | 31.56801.7 | 10.43265 | 6.78172.3 | 639397 | 32 |
| 255/70R18 | 32.06814.2 | 10.04255 | 7.03178.5 | 629391 | 32 |
| 275/65R18 | 32.07814.7 | 10.83275 | 7.04178.8 | 629391 | 32 |
| 305/60R18 | 32.41823.2 | 12.01305 | 7.20183.0 | 622387 | 32 |
| 285/65R18 | 32.59827.7 | 11.22285 | 7.29185.3 | 619385 | 33 |
| 265/70R18 | 32.61828.2 | 10.43265 | 7.30185.5 | 619384 | 33 |
| 235/80R18 | 32.80833.2 | 9.25235 | 7.40188.0 | 615382 | 33 |
| 33x12.50R18 | 33.00838.2 | 12.50318 | 7.50190.5 | 611380 | 33 |
| 275/70R18 | 33.16842.2 | 10.83275 | 7.58192.5 | 608378 | 33 |
| 325/60R18 | 33.35847.2 | 12.80325 | 7.68195.0 | 605376 | 33 |
| 305/65R18 | 33.61853.7 | 12.01305 | 7.81198.3 | 600373 | 34 |
| 285/70R18 | 33.71856.2 | 11.22285 | 7.85199.5 | 598372 | 34 |
| 295/70R18 | 34.26870.2 | 11.61295 | 8.13206.5 | 589366 | 34 |
| 325/65R18 | 34.63879.7 | 12.80325 | 8.32211.3 | 582362 | 35 |
| 305/70R18 | 34.81884.2 | 12.01305 | 8.41213.5 | 579360 | 35 |
| 285/75R18 | 34.83884.7 | 11.22285 | 8.42213.8 | 579360 | 35 |
| 35x12.50R18 | 35.00889.0 | 12.50318 | 8.50215.9 | 576358 | 35 |
| 37x12.50R18 | 37.00939.8 | 12.50318 | 9.50241.3 | 545339 | 37 |
Units: inches, revolutions per milemm, revolutions per km. Flotation sizes (like 33x12.50R17) are nominal. Class is the calculated diameter rounded to the nearest inch.
Sources
- Kumho Tire USA: Crugen HT51 size and technical data, retrieved 29 October 2026
- Kumho Tire USA: Road Venture AT52 size and technical data, retrieved 29 October 2026
- Kumho Tire USA: Solus TA51a size and technical data, retrieved 29 October 2026
- Nitto Dura Grappler: sizes and specifications, retrieved 29 October 2026
- Nitto Recon Grappler A/T: sizes and specifications, retrieved 29 October 2026
- Nitto Terra Grappler G3: sizes and specifications, retrieved 29 October 2026
- Nitto Trail Grappler M/T: sizes and specifications, retrieved 29 October 2026
- Toyo Tires: Celsius Sport sizes and specifications (spec-table data), retrieved 29 October 2026
- Toyo Tires: Open Country A/T III sizes and specifications (spec-table data the product page loads), retrieved 29 October 2026
- Toyo Tires: Open Country A/T III EV sizes and specifications (spec-table data), retrieved 29 October 2026
- Toyo Tires: Open Country M/T sizes and specifications (spec-table data), retrieved 29 October 2026
- Toyo Tires: Open Country R/T sizes and specifications (spec-table data), retrieved 29 October 2026
Data verified 29 October 2026 against these sources. See the methodology for how disagreements are resolved.