Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 275/45-21 | 285/45-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.74 (780.9) | 31.1 (789.9) | 0.35 (9) 1.2% |
| Width inches (mm) | 10.83 (275) | 11.22 (285) | 0.39 (10) 3.6% |
| Circum. inches (mm) | 96.59 (2453.27) | 97.7 (2481.54) | 1.11 (28.27) 1.2% |
| Sidewall Height inches (mm) | 4.87 (123.75) | 5.05 (128.25) | 0.18 (4.5) 3.6% |
| Revolutions per mile (km) | 656 (407.62) | 648.53 (402.97) | -7.47 (-4.64) -1.1% |
285/45-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.23 mph (32.56 km/h) |
| 25 mph (40.23 km/h) | 25.29 mph (40.7 km/h) |
| 30 mph (48.28 km/h) | 30.35 mph (48.84 km/h) |
| 35 mph (56.33 km/h) | 35.4 mph (56.98 km/h) |
| 40 mph (64.37 km/h) | 40.46 mph (65.12 km/h) |
| 45 mph (72.42 km/h) | 45.52 mph (73.26 km/h) |
| 50 mph (80.47 km/h) | 50.58 mph (81.39 km/h) |
| 55 mph (88.51 km/h) | 55.63 mph (89.53 km/h) |
| 60 mph (96.56 km/h) | 60.69 mph (97.67 km/h) |
| 65 mph (104.61 km/h) | 65.75 mph (105.81 km/h) |
| 70 mph (112.65 km/h) | 70.81 mph (113.95 km/h) |
| 75 mph (120.7 km/h) | 75.86 mph (122.09 km/h) |
| 80 mph (128.75 km/h) | 80.92 mph (130.23 km/h) |
| 85 mph (136.79 km/h) | 85.98 mph (138.37 km/h) |
| 90 mph (144.84 km/h) | 91.04 mph (146.51 km/h) |
| 95 mph (152.89 km/h) | 96.09 mph (154.65 km/h) |
| 100 mph (160.93 km/h) | 101.15 mph (162.79 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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