Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 28.68 (728.5) | -1.72 (-43.7) -5.7% |
| Width inches (mm) | 6.89 (175) | 9.65 (245) | 2.76 (70) 40% |
| Circum. inches (mm) | 95.51 (2425.94) | 90.1 (2288.65) | -5.41 (-137.29) -5.7% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 4.34 (110.25) | -1.86 (-47.25) -30% |
| Revolutions per mile (km) | 663.39 (412.21) | 703.18 (436.94) | 39.79 (24.73) 6% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.87 mph (30.37 km/h) |
| 25 mph (40.23 km/h) | 23.59 mph (37.96 km/h) |
| 30 mph (48.28 km/h) | 28.3 mph (45.55 km/h) |
| 35 mph (56.33 km/h) | 33.02 mph (53.14 km/h) |
| 40 mph (64.37 km/h) | 37.74 mph (60.73 km/h) |
| 45 mph (72.42 km/h) | 42.45 mph (68.32 km/h) |
| 50 mph (80.47 km/h) | 47.17 mph (75.91 km/h) |
| 55 mph (88.51 km/h) | 51.89 mph (83.5 km/h) |
| 60 mph (96.56 km/h) | 56.6 mph (91.1 km/h) |
| 65 mph (104.61 km/h) | 61.32 mph (98.69 km/h) |
| 70 mph (112.65 km/h) | 66.04 mph (106.28 km/h) |
| 75 mph (120.7 km/h) | 70.76 mph (113.87 km/h) |
| 80 mph (128.75 km/h) | 75.47 mph (121.46 km/h) |
| 85 mph (136.79 km/h) | 80.19 mph (129.05 km/h) |
| 90 mph (144.84 km/h) | 84.91 mph (136.64 km/h) |
| 95 mph (152.89 km/h) | 89.62 mph (144.24 km/h) |
| 100 mph (160.93 km/h) | 94.34 mph (151.83 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1789 | 2079 | 2239 | 2338 | 2444 | 2520 | 2604 | 2703 | 2840 | 2977 | 3130 | 3252 | 3472 | 3716 | 3906 | 4028 | 4097 | 4348 | 4698 | 5460 |
Better Fuel Economy Factory Ratios Increased Power
