Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/65-18 | 285/75-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.21 (691.2) | 36.83 (935.5) | 9.62 (244.3) 35.3% |
| Width inches (mm) | 7.09 (180) | 11.22 (285) | 4.13 (105) 58.3% |
| Circum. inches (mm) | 85.49 (2171.47) | 115.71 (2938.96) | 30.22 (767.49) 35.3% |
| Sidewall Height inches (mm) | 4.61 (117) | 8.42 (213.75) | 3.81 (96.75) 82.7% |
| Revolutions per mile (km) | 741.13 (460.52) | 547.59 (340.26) | -193.54 (-120.26) -26.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 27.07 mph (43.56 km/h) |
| 25 mph (40.23 km/h) | 33.84 mph (54.45 km/h) |
| 30 mph (48.28 km/h) | 40.6 mph (65.34 km/h) |
| 35 mph (56.33 km/h) | 47.37 mph (76.24 km/h) |
| 40 mph (64.37 km/h) | 54.14 mph (87.13 km/h) |
| 45 mph (72.42 km/h) | 60.9 mph (98.02 km/h) |
| 50 mph (80.47 km/h) | 67.67 mph (108.91 km/h) |
| 55 mph (88.51 km/h) | 74.44 mph (119.8 km/h) |
| 60 mph (96.56 km/h) | 81.21 mph (130.69 km/h) |
| 65 mph (104.61 km/h) | 87.97 mph (141.58 km/h) |
| 70 mph (112.65 km/h) | 94.74 mph (152.47 km/h) |
| 75 mph (120.7 km/h) | 101.51 mph (163.36 km/h) |
| 80 mph (128.75 km/h) | 108.28 mph (174.25 km/h) |
| 85 mph (136.79 km/h) | 115.04 mph (185.14 km/h) |
| 90 mph (144.84 km/h) | 121.81 mph (196.03 km/h) |
| 95 mph (152.89 km/h) | 128.58 mph (206.93 km/h) |
| 100 mph (160.93 km/h) | 135.34 mph (217.82 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1394 | 1619 | 1743 | 1820 | 1903 | 1963 | 2028 | 2105 | 2212 | 2319 | 2437 | 2532 | 2704 | 2894 | 3042 | 3137 | 3190 | 3386 | 3659 | 4252 |
Better Fuel Economy Factory Ratios Increased Power
