Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/85-18 | 246/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.37 (720.7) | 28.72 (729.4) | 0.34 (8.7) 1.2% |
| Width inches (mm) | 6.1 (155) | 9.69 (246) | 3.58 (91) 58.7% |
| Circum. inches (mm) | 89.14 (2264.15) | 90.22 (2291.48) | 1.08 (27.33) 1.2% |
| Sidewall Height inches (mm) | 5.19 (131.75) | 4.36 (110.7) | -0.83 (-21.05) -16% |
| Revolutions per mile (km) | 710.8 (441.67) | 702.32 (436.4) | -8.48 (-5.27) -1.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.24 mph (32.58 km/h) |
| 25 mph (40.23 km/h) | 25.3 mph (40.72 km/h) |
| 30 mph (48.28 km/h) | 30.36 mph (48.86 km/h) |
| 35 mph (56.33 km/h) | 35.42 mph (57.01 km/h) |
| 40 mph (64.37 km/h) | 40.48 mph (65.15 km/h) |
| 45 mph (72.42 km/h) | 45.54 mph (73.29 km/h) |
| 50 mph (80.47 km/h) | 50.6 mph (81.44 km/h) |
| 55 mph (88.51 km/h) | 55.66 mph (89.58 km/h) |
| 60 mph (96.56 km/h) | 60.72 mph (97.73 km/h) |
| 65 mph (104.61 km/h) | 65.78 mph (105.87 km/h) |
| 70 mph (112.65 km/h) | 70.85 mph (114.01 km/h) |
| 75 mph (120.7 km/h) | 75.91 mph (122.16 km/h) |
| 80 mph (128.75 km/h) | 80.97 mph (130.3 km/h) |
| 85 mph (136.79 km/h) | 86.03 mph (138.45 km/h) |
| 90 mph (144.84 km/h) | 91.09 mph (146.59 km/h) |
| 95 mph (152.89 km/h) | 96.15 mph (154.73 km/h) |
| 100 mph (160.93 km/h) | 101.21 mph (162.88 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1787 | 2076 | 2236 | 2335 | 2441 | 2517 | 2601 | 2700 | 2837 | 2974 | 3126 | 3247 | 3468 | 3711 | 3902 | 4023 | 4092 | 4343 | 4693 | 5453 |
Better Fuel Economy Factory Ratios Increased Power
