Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/60-20 | 285/60-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.85 (682) | 31.46 (799.2) | 4.61 (117.2) 17.2% |
| Width inches (mm) | 5.71 (145) | 11.22 (285) | 5.51 (140) 96.6% |
| Circum. inches (mm) | 84.35 (2142.57) | 98.85 (2510.76) | 14.5 (368.19) 17.2% |
| Sidewall Height inches (mm) | 3.43 (87) | 6.73 (171) | 3.31 (84) 96.6% |
| Revolutions per mile (km) | 751.13 (466.73) | 640.98 (398.28) | -110.15 (-68.44) -14.7% |
285/60-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.44 mph (37.72 km/h) |
| 25 mph (40.23 km/h) | 29.3 mph (47.15 km/h) |
| 30 mph (48.28 km/h) | 35.16 mph (56.58 km/h) |
| 35 mph (56.33 km/h) | 41.01 mph (66.01 km/h) |
| 40 mph (64.37 km/h) | 46.87 mph (75.44 km/h) |
| 45 mph (72.42 km/h) | 52.73 mph (84.87 km/h) |
| 50 mph (80.47 km/h) | 58.59 mph (94.3 km/h) |
| 55 mph (88.51 km/h) | 64.45 mph (103.73 km/h) |
| 60 mph (96.56 km/h) | 70.31 mph (113.15 km/h) |
| 65 mph (104.61 km/h) | 76.17 mph (122.58 km/h) |
| 70 mph (112.65 km/h) | 82.03 mph (132.01 km/h) |
| 75 mph (120.7 km/h) | 87.89 mph (141.44 km/h) |
| 80 mph (128.75 km/h) | 93.75 mph (150.87 km/h) |
| 85 mph (136.79 km/h) | 99.61 mph (160.3 km/h) |
| 90 mph (144.84 km/h) | 105.47 mph (169.73 km/h) |
| 95 mph (152.89 km/h) | 111.33 mph (179.16 km/h) |
| 100 mph (160.93 km/h) | 117.18 mph (188.59 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1631 | 1895 | 2041 | 2131 | 2228 | 2298 | 2374 | 2464 | 2589 | 2714 | 2853 | 2964 | 3165 | 3387 | 3561 | 3672 | 3734 | 3963 | 4283 | 4977 |
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