Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/60-17 | 285/60-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.41 (797.8) | 33.46 (850) | 2.06 (52.2) 6.5% |
| Width inches (mm) | 12.01 (305) | 11.22 (285) | -0.79 (-20) -6.6% |
| Circum. inches (mm) | 98.68 (2506.36) | 105.13 (2670.35) | 6.46 (163.99) 6.5% |
| Sidewall Height inches (mm) | 7.2 (183) | 6.73 (171) | -0.47 (-12) -6.6% |
| Revolutions per mile (km) | 642.1 (398.98) | 602.67 (374.48) | -39.43 (-24.5) -6.1% |
285/60-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.31 mph (34.29 km/h) |
| 25 mph (40.23 km/h) | 26.64 mph (42.87 km/h) |
| 30 mph (48.28 km/h) | 31.96 mph (51.44 km/h) |
| 35 mph (56.33 km/h) | 37.29 mph (60.01 km/h) |
| 40 mph (64.37 km/h) | 42.62 mph (68.59 km/h) |
| 45 mph (72.42 km/h) | 47.94 mph (77.16 km/h) |
| 50 mph (80.47 km/h) | 53.27 mph (85.73 km/h) |
| 55 mph (88.51 km/h) | 58.6 mph (94.31 km/h) |
| 60 mph (96.56 km/h) | 63.93 mph (102.88 km/h) |
| 65 mph (104.61 km/h) | 69.25 mph (111.45 km/h) |
| 70 mph (112.65 km/h) | 74.58 mph (120.03 km/h) |
| 75 mph (120.7 km/h) | 79.91 mph (128.6 km/h) |
| 80 mph (128.75 km/h) | 85.23 mph (137.17 km/h) |
| 85 mph (136.79 km/h) | 90.56 mph (145.74 km/h) |
| 90 mph (144.84 km/h) | 95.89 mph (154.32 km/h) |
| 95 mph (152.89 km/h) | 101.22 mph (162.89 km/h) |
| 100 mph (160.93 km/h) | 106.54 mph (171.46 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1534 | 1782 | 1919 | 2004 | 2095 | 2160 | 2232 | 2317 | 2434 | 2552 | 2682 | 2787 | 2976 | 3185 | 3348 | 3452 | 3511 | 3727 | 4027 | 4679 |
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