Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/55-18 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.18 (715.7) | 28.68 (728.5) | 0.5 (12.8) 1.8% |
| Width inches (mm) | 9.25 (235) | 9.65 (245) | 0.39 (10) 4.3% |
| Circum. inches (mm) | 88.52 (2248.44) | 90.1 (2288.65) | 1.58 (40.21) 1.8% |
| Sidewall Height inches (mm) | 5.09 (129.25) | 4.34 (110.25) | -0.75 (-19) -14.7% |
| Revolutions per mile (km) | 715.76 (444.75) | 703.18 (436.94) | -12.58 (-7.81) -1.8% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.36 mph (32.76 km/h) |
| 25 mph (40.23 km/h) | 25.45 mph (40.95 km/h) |
| 30 mph (48.28 km/h) | 30.54 mph (49.14 km/h) |
| 35 mph (56.33 km/h) | 35.63 mph (57.33 km/h) |
| 40 mph (64.37 km/h) | 40.72 mph (65.53 km/h) |
| 45 mph (72.42 km/h) | 45.8 mph (73.72 km/h) |
| 50 mph (80.47 km/h) | 50.89 mph (81.91 km/h) |
| 55 mph (88.51 km/h) | 55.98 mph (90.1 km/h) |
| 60 mph (96.56 km/h) | 61.07 mph (98.29 km/h) |
| 65 mph (104.61 km/h) | 66.16 mph (106.48 km/h) |
| 70 mph (112.65 km/h) | 71.25 mph (114.67 km/h) |
| 75 mph (120.7 km/h) | 76.34 mph (122.86 km/h) |
| 80 mph (128.75 km/h) | 81.43 mph (131.05 km/h) |
| 85 mph (136.79 km/h) | 86.52 mph (139.24 km/h) |
| 90 mph (144.84 km/h) | 91.61 mph (147.43 km/h) |
| 95 mph (152.89 km/h) | 96.7 mph (155.62 km/h) |
| 100 mph (160.93 km/h) | 101.79 mph (163.81 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
