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21-inch tires: sizes and treadwear
Quick answer: NHTSA’s UTQG data lists 38 tire sizes for 21-inch wheels (38 with a treadwear grade). 56 tire lines have a grade at one or more of them, and the median treadwear across line × size grades is 280. The size with the most graded lines is 275/35R21 (15).
38graded sizes
56lines
280median grade
200line × size grades
21-inch sizes in the NHTSA data
| Size | Graded lines | Highest treadwear | Median treadwear |
|---|---|---|---|
| 275/35R21 | 15 | 600 | 280 |
| 275/45R21 | 14 | 540 | 300 |
| 295/35R21 | 12 | 540 | 290 |
| 255/40R21 | 11 | 540 | 260 |
| 265/45R21 | 10 | 540 | 310 |
| 315/40R21 | 10 | 540 | 280 |
| 285/45R21 | 9 | 600 | 280 |
| 245/35R21 | 8 | 340 | 230 |
| 265/40R21 | 8 | 540 | 310 |
| 295/40R21 | 8 | 540 | 370 |
| 245/40R21 | 7 | 340 | 300 |
| 255/35R21 | 7 | 600 | 260 |
| 255/50R21 | 7 | 560 | 300 |
| 265/35R21 | 7 | 500 | 240 |
| 275/40R21 | 7 | 320 | 220 |
| 315/35R21 | 7 | 400 | 240 |
| 325/30R21 | 7 | 540 | 300 |
| 285/35R21 | 6 | 440 | 310 |
| 295/30R21 | 5 | 300 | 240 |
| 255/45R21 | 4 | 560 | 490 |
| 285/30R21 | 4 | 240 | 210 |
| 285/40R21 | 4 | 420 | 410 |
| 315/30R21 | 4 | 540 | 270 |
| 345/25R21 | 3 | 540 | 300 |
| 275/50R21 | 2 | 320 | 300 |
| 305/30R21 | 2 | 500 | 425 |
| 225/45R21 | 1 | 540 | 540 |
| 235/45R21 | 1 | 540 | 540 |
| 235/50R21 | 1 | 280 | 280 |
| 245/45R21 | 1 | 240 | 240 |
| 255/30R21 | 1 | 180 | 180 |
| 275/30R21 | 1 | 240 | 240 |
| 295/25R21 | 1 | 180 | 180 |
| 295/45R21 | 1 | 540 | 540 |
| 315/45R21 | 1 | 280 | 280 |
| 325/25R21 | 1 | 240 | 240 |
| 325/40R21 | 1 | 240 | 240 |
| 355/25R21 | 1 | 120 | 120 |
Sizes link only where this build has a page. Click a heading to sort.
Treadwear mix at 21 inches
| Treadwear band | Line × size grades | Share |
|---|---|---|
| Under 200 | 13 | 6.5% |
| 200–299 | 96 | 48% |
| 300–399 | 40 | 20% |
| 400–499 | 18 | 9% |
| 500–599 | 30 | 15% |
| 600–699 | 3 | 1.5% |
Brands with the most 21-inch lines
| Brand | Lines graded at 21 inches |
|---|---|
| Hankook | 21 |
| Michelin | 10 |
| Continental | 9 |
| Goodyear | 6 |
| Dunlop | 3 |
| Paragon | 2 |
| Blackhawk | 1 |
| Bridgestone | 1 |
| Nitto | 1 |
| Norauto | 1 |
Highest treadwear grades at 21 inches
| Tire line | Size | Treadwear |
|---|---|---|
| Hankook iON evo AS SUV (OE) | 275/35R21 | 600 |
| Hankook veNtus S1 evo Z AS X (OE) | 285/45R21 | 600 |
| Hankook iON evo AS SUV (OE) | 255/35R21 | 600 |
| Hankook Dynapro HP2 (OE) | 285/45R21 | 560 |
| Hankook iON evo AS SUV (OE) | 285/45R21 | 560 |
| Hankook iON evo AS SUV (OE) | 255/50R21 | 560 |
| Hankook iON evo AS SUV (OE) | 255/45R21 | 560 |
| Michelin Pilot Sport All Season 4 | 275/35R21 | 540 |
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Guides that explain these numbers
FAQ
What does the 21 mean in a tire size?
In a size like 225/65R21, 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 21-inch tire size in NHTSA's data?
By number of graded lines, 275/35R21 (15 line × size grades), followed by 275/45R21 (14). This reflects what is in the NHTSA database, not sales.
What is the typical treadwear grade for 21-inch tires?
The median across 200 line × size grades is 280. Treadwear is the maker's wear rating relative to a control tire, not miles.