Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/60-18 | 245/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.32 (643.2) | 25.79 (655) | 0.46 (11.8) 1.8% |
| Width inches (mm) | 6.1 (155) | 9.65 (245) | 3.54 (90) 58.1% |
| Circum. inches (mm) | 79.55 (2020.67) | 81.01 (2057.74) | 1.46 (37.07) 1.8% |
| Sidewall Height inches (mm) | 3.66 (93) | 2.89 (73.5) | -0.77 (-19.5) -21% |
| Revolutions per mile (km) | 796.44 (494.88) | 782.09 (485.97) | -14.35 (-8.92) -1.8% |
245/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.37 mph (32.78 km/h) |
| 25 mph (40.23 km/h) | 25.46 mph (40.97 km/h) |
| 30 mph (48.28 km/h) | 30.55 mph (49.17 km/h) |
| 35 mph (56.33 km/h) | 35.64 mph (57.36 km/h) |
| 40 mph (64.37 km/h) | 40.73 mph (65.55 km/h) |
| 45 mph (72.42 km/h) | 45.83 mph (73.75 km/h) |
| 50 mph (80.47 km/h) | 50.92 mph (81.94 km/h) |
| 55 mph (88.51 km/h) | 56.01 mph (90.14 km/h) |
| 60 mph (96.56 km/h) | 61.1 mph (98.33 km/h) |
| 65 mph (104.61 km/h) | 66.19 mph (106.53 km/h) |
| 70 mph (112.65 km/h) | 71.28 mph (114.72 km/h) |
| 75 mph (120.7 km/h) | 76.38 mph (122.92 km/h) |
| 80 mph (128.75 km/h) | 81.47 mph (131.11 km/h) |
| 85 mph (136.79 km/h) | 86.56 mph (139.3 km/h) |
| 90 mph (144.84 km/h) | 91.65 mph (147.5 km/h) |
| 95 mph (152.89 km/h) | 96.74 mph (155.69 km/h) |
| 100 mph (160.93 km/h) | 101.83 mph (163.89 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1990 | 2312 | 2490 | 2600 | 2719 | 2803 | 2896 | 3007 | 3159 | 3311 | 3481 | 3616 | 3862 | 4133 | 4345 | 4480 | 4556 | 4836 | 5226 | 6072 |
Better Fuel Economy Factory Ratios Increased Power
