Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/80-19 | 285/45-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.76 (730.6) | 31.1 (789.9) | 2.33 (59.3) 8.1% |
| Width inches (mm) | 6.1 (155) | 11.22 (285) | 5.12 (130) 83.9% |
| Circum. inches (mm) | 90.36 (2295.25) | 97.7 (2481.54) | 7.33 (186.3) 8.1% |
| Sidewall Height inches (mm) | 4.88 (124) | 5.05 (128.25) | 0.17 (4.25) 3.4% |
| Revolutions per mile (km) | 701.16 (435.68) | 648.53 (402.97) | -52.64 (-32.71) -7.5% |
285/45-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.62 mph (34.8 km/h) |
| 25 mph (40.23 km/h) | 27.03 mph (43.5 km/h) |
| 30 mph (48.28 km/h) | 32.43 mph (52.2 km/h) |
| 35 mph (56.33 km/h) | 37.84 mph (60.9 km/h) |
| 40 mph (64.37 km/h) | 43.25 mph (69.6 km/h) |
| 45 mph (72.42 km/h) | 48.65 mph (78.3 km/h) |
| 50 mph (80.47 km/h) | 54.06 mph (87 km/h) |
| 55 mph (88.51 km/h) | 59.46 mph (95.7 km/h) |
| 60 mph (96.56 km/h) | 64.87 mph (104.4 km/h) |
| 65 mph (104.61 km/h) | 70.28 mph (113.1 km/h) |
| 70 mph (112.65 km/h) | 75.68 mph (121.8 km/h) |
| 75 mph (120.7 km/h) | 81.09 mph (130.5 km/h) |
| 80 mph (128.75 km/h) | 86.49 mph (139.2 km/h) |
| 85 mph (136.79 km/h) | 91.9 mph (147.9 km/h) |
| 90 mph (144.84 km/h) | 97.3 mph (156.6 km/h) |
| 95 mph (152.89 km/h) | 102.71 mph (165.3 km/h) |
| 100 mph (160.93 km/h) | 108.12 mph (174 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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