Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-18 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.13 (689.2) | 28.68 (728.5) | 1.55 (39.3) 5.7% |
| Width inches (mm) | 5.71 (145) | 9.65 (245) | 3.94 (100) 69% |
| Circum. inches (mm) | 85.24 (2165.19) | 90.1 (2288.65) | 4.86 (123.46) 5.7% |
| Sidewall Height inches (mm) | 4.57 (116) | 4.34 (110.25) | -0.23 (-5.75) -5% |
| Revolutions per mile (km) | 743.28 (461.85) | 703.18 (436.94) | -40.1 (-24.92) -5.4% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.14 mph (34.02 km/h) |
| 25 mph (40.23 km/h) | 26.43 mph (42.53 km/h) |
| 30 mph (48.28 km/h) | 31.71 mph (51.03 km/h) |
| 35 mph (56.33 km/h) | 37 mph (59.54 km/h) |
| 40 mph (64.37 km/h) | 42.28 mph (68.04 km/h) |
| 45 mph (72.42 km/h) | 47.57 mph (76.55 km/h) |
| 50 mph (80.47 km/h) | 52.85 mph (85.06 km/h) |
| 55 mph (88.51 km/h) | 58.14 mph (93.56 km/h) |
| 60 mph (96.56 km/h) | 63.42 mph (102.07 km/h) |
| 65 mph (104.61 km/h) | 68.71 mph (110.57 km/h) |
| 70 mph (112.65 km/h) | 73.99 mph (119.08 km/h) |
| 75 mph (120.7 km/h) | 79.28 mph (127.58 km/h) |
| 80 mph (128.75 km/h) | 84.56 mph (136.09 km/h) |
| 85 mph (136.79 km/h) | 89.85 mph (144.59 km/h) |
| 90 mph (144.84 km/h) | 95.13 mph (153.1 km/h) |
| 95 mph (152.89 km/h) | 100.42 mph (161.61 km/h) |
| 100 mph (160.93 km/h) | 105.7 mph (170.11 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
