Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/50-21 | 285/45-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.04 (788.4) | 31.1 (789.9) | 0.06 (1.5) 0.2% |
| Width inches (mm) | 10.04 (255) | 11.22 (285) | 1.18 (30) 11.8% |
| Circum. inches (mm) | 97.51 (2476.83) | 97.7 (2481.54) | 0.19 (4.71) 0.2% |
| Sidewall Height inches (mm) | 5.02 (127.5) | 5.05 (128.25) | 0.03 (0.75) 0.6% |
| Revolutions per mile (km) | 649.76 (403.74) | 648.53 (402.97) | -1.23 (-0.77) -0.2% |
285/45-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.04 mph (32.25 km/h) |
| 25 mph (40.23 km/h) | 25.05 mph (40.31 km/h) |
| 30 mph (48.28 km/h) | 30.06 mph (48.37 km/h) |
| 35 mph (56.33 km/h) | 35.07 mph (56.43 km/h) |
| 40 mph (64.37 km/h) | 40.08 mph (64.5 km/h) |
| 45 mph (72.42 km/h) | 45.09 mph (72.56 km/h) |
| 50 mph (80.47 km/h) | 50.1 mph (80.62 km/h) |
| 55 mph (88.51 km/h) | 55.1 mph (88.68 km/h) |
| 60 mph (96.56 km/h) | 60.11 mph (96.74 km/h) |
| 65 mph (104.61 km/h) | 65.12 mph (104.81 km/h) |
| 70 mph (112.65 km/h) | 70.13 mph (112.87 km/h) |
| 75 mph (120.7 km/h) | 75.14 mph (120.93 km/h) |
| 80 mph (128.75 km/h) | 80.15 mph (128.99 km/h) |
| 85 mph (136.79 km/h) | 85.16 mph (137.05 km/h) |
| 90 mph (144.84 km/h) | 90.17 mph (145.12 km/h) |
| 95 mph (152.89 km/h) | 95.18 mph (153.18 km/h) |
| 100 mph (160.93 km/h) | 100.19 mph (161.24 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1650 | 1917 | 2065 | 2156 | 2254 | 2325 | 2402 | 2493 | 2620 | 2746 | 2886 | 2999 | 3202 | 3427 | 3603 | 3715 | 3778 | 4010 | 4333 | 5035 |
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