Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/85-18 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.37 (720.7) | 28.68 (728.5) | 0.31 (7.8) 1.1% |
| Width inches (mm) | 6.1 (155) | 9.65 (245) | 3.54 (90) 58.1% |
| Circum. inches (mm) | 89.14 (2264.15) | 90.1 (2288.65) | 0.96 (24.5) 1.1% |
| Sidewall Height inches (mm) | 5.19 (131.75) | 4.34 (110.25) | -0.85 (-21.5) -16.3% |
| Revolutions per mile (km) | 710.8 (441.67) | 703.18 (436.94) | -7.61 (-4.73) -1.1% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.22 mph (32.54 km/h) |
| 25 mph (40.23 km/h) | 25.27 mph (40.67 km/h) |
| 30 mph (48.28 km/h) | 30.32 mph (48.8 km/h) |
| 35 mph (56.33 km/h) | 35.38 mph (56.94 km/h) |
| 40 mph (64.37 km/h) | 40.43 mph (65.07 km/h) |
| 45 mph (72.42 km/h) | 45.49 mph (73.2 km/h) |
| 50 mph (80.47 km/h) | 50.54 mph (81.34 km/h) |
| 55 mph (88.51 km/h) | 55.6 mph (89.47 km/h) |
| 60 mph (96.56 km/h) | 60.65 mph (97.61 km/h) |
| 65 mph (104.61 km/h) | 65.7 mph (105.74 km/h) |
| 70 mph (112.65 km/h) | 70.76 mph (113.87 km/h) |
| 75 mph (120.7 km/h) | 75.81 mph (122.01 km/h) |
| 80 mph (128.75 km/h) | 80.87 mph (130.14 km/h) |
| 85 mph (136.79 km/h) | 85.92 mph (138.28 km/h) |
| 90 mph (144.84 km/h) | 90.97 mph (146.41 km/h) |
| 95 mph (152.89 km/h) | 96.03 mph (154.54 km/h) |
| 100 mph (160.93 km/h) | 101.08 mph (162.68 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
