Tires by rim diameter
Quick answer: The last number in a tire size (the “17” in 225/65R17) is the wheel diameter in inches. Pick yours to see every size NHTSA’s data lists for that diameter, how many lines are graded for each, and the typical treadwear grade. Rim diameters with fewer than 15 explicit-size records have no page. How to read a sidewall.
| Rim diameter | Sizes | Line × size grades | Median treadwear |
|---|---|---|---|
| 13-inch | 19 | 119 | 400 |
| 14-inch | 33 | 322 | 440 |
| 15-inch | 47 | 598 | 440 |
| 16-inch | 51 | 642 | 490 |
| 17-inch | 56 | 746 | 460 |
| 18-inch | 57 | 674 | 400 |
| 19-inch | 51 | 461 | 320 |
| 20-inch | 63 | 452 | 320 |
| 21-inch | 38 | 200 | 280 |
| 22-inch | 28 | 130 | 340 |
| 23-inch | 9 | 15 | 320 |
| 24-inch | 8 | 22 | 420 |
“Line × size grades” counts each (line, size) pair with a treadwear grade in the NHTSA file; the median is over those pairs.