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18-inch tires: sizes and treadwear
Quick answer: NHTSA’s UTQG data lists 57 tire sizes for 18-inch wheels (57 with a treadwear grade). 256 tire lines have a grade at one or more of them, and the median treadwear across line × size grades is 400. The size with the most graded lines is 225/40R18 (50).
57graded sizes
256lines
400median grade
674line × size grades
18-inch sizes in the NHTSA data
| Size | Graded lines | Highest treadwear | Median treadwear |
|---|---|---|---|
| 225/40R18 | 50 | 500 | 360 |
| 235/55R18 | 37 | 700 | 500 |
| 235/60R18 | 36 | 780 | 420 |
| 225/45R18 | 35 | 560 | 360 |
| 245/45R18 | 33 | 500 | 380 |
| 265/60R18 | 28 | 720 | 530 |
| 245/40R18 | 27 | 500 | 360 |
| 235/40R18 | 26 | 560 | 350 |
| 255/55R18 | 24 | 800 | 410 |
| 235/45R18 | 23 | 580 | 480 |
| 225/60R18 | 21 | 600 | 420 |
| 225/55R18 | 19 | 740 | 500 |
| 235/65R18 | 17 | 700 | 520 |
| 265/70R18 | 17 | 600 | 500 |
| 245/60R18 | 16 | 700 | 540 |
| 275/65R18 | 15 | 800 | 540 |
| 255/65R18 | 14 | 800 | 570 |
| 225/50R18 | 13 | 700 | 400 |
| 235/50R18 | 13 | 520 | 440 |
| 255/35R18 | 13 | 500 | 300 |
| 255/45R18 | 13 | 500 | 340 |
| 265/35R18 | 13 | 500 | 300 |
| 215/55R18 | 12 | 700 | 510 |
| 255/40R18 | 12 | 560 | 300 |
| 215/45R18 | 11 | 720 | 340 |
| 285/60R18 | 11 | 600 | 500 |
| 215/35R18 | 10 | 500 | 320 |
| 245/50R18 | 10 | 500 | 440 |
| 255/60R18 | 9 | 680 | 440 |
| 265/65R18 | 9 | 800 | 580 |
| 275/35R18 | 9 | 500 | 340 |
| 215/50R18 | 8 | 500 | 290 |
| 255/70R18 | 8 | 700 | 580 |
| 275/40R18 | 8 | 340 | 260 |
| 215/40R18 | 7 | 400 | 240 |
| 245/35R18 | 6 | 320 | 280 |
| 225/35R18 | 4 | 300 | 250 |
| 315/30R18 | 4 | 200 | 120 |
| 285/30R18 | 3 | 180 | 180 |
| 295/30R18 | 3 | 180 | 180 |
Showing 40 of 57 sizes, most graded lines first. Sizes link only where this build has a page. Click a heading to sort.
Treadwear mix at 18 inches
| Treadwear band | Line × size grades | Share |
|---|---|---|
| Under 200 | 49 | 7.3% |
| 200–299 | 105 | 15.6% |
| 300–399 | 135 | 20% |
| 400–499 | 121 | 18% |
| 500–599 | 192 | 28.5% |
| 600–699 | 40 | 5.9% |
| 700–799 | 28 | 4.2% |
| 800 and up | 4 | 0.6% |
Brands with the most 18-inch lines
| Brand | Lines graded at 18 inches |
|---|---|
| Hankook | 58 |
| Bridgestone | 23 |
| Continental | 16 |
| Goodyear | 13 |
| Falken | 11 |
| Yokohama | 11 |
| Michelin | 10 |
| Nexen | 9 |
| Dunlop | 8 |
| Tornel | 7 |
Highest treadwear grades at 18 inches
| Tire line | Size | Treadwear |
|---|---|---|
| Bridgestone DUELER H/L ALENZA PLUS "W" Spd Rtd | 255/55R18 | 800 |
| Bridgestone Alenza AS Ultra | 275/65R18 | 800 |
| Bridgestone Alenza AS Ultra | 255/65R18 | 800 |
| Bridgestone Alenza AS Ultra | 265/65R18 | 800 |
| Hankook DynaPro HL3 | 235/60R18 | 780 |
| Hankook KInERGy GT (OE) | 225/55R18 | 740 |
| Michelin Latitude Tour | 265/60R18 | 720 |
| Hankook iON ST AS SUV | 215/45R18 | 720 |
← 17-inch · 19-inch → · All rim sizes
Guides that explain these numbers
FAQ
What does the 18 mean in a tire size?
In a size like 225/65R18, the number after R is the wheel (rim) diameter in inches. It must match your wheel exactly; width and aspect ratio come from your vehicle's placard.
What is the most common 18-inch tire size in NHTSA's data?
By number of graded lines, 225/40R18 (50 line × size grades), followed by 235/55R18 (37). This reflects what is in the NHTSA database, not sales.
What is the typical treadwear grade for 18-inch tires?
The median across 674 line × size grades is 400. Treadwear is the maker's wear rating relative to a control tire, not miles.