Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/90-18 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.98 (736.2) | 28.68 (728.5) | -0.3 (-7.7) -1% |
| Width inches (mm) | 6.1 (155) | 9.65 (245) | 3.54 (90) 58.1% |
| Circum. inches (mm) | 91.06 (2312.84) | 90.1 (2288.65) | -0.95 (-24.19) -1% |
| Sidewall Height inches (mm) | 5.49 (139.5) | 4.34 (110.25) | -1.15 (-29.25) -21% |
| Revolutions per mile (km) | 695.83 (432.37) | 703.18 (436.94) | 7.35 (4.57) 1.1% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.79 mph (31.85 km/h) |
| 25 mph (40.23 km/h) | 24.74 mph (39.81 km/h) |
| 30 mph (48.28 km/h) | 29.69 mph (47.78 km/h) |
| 35 mph (56.33 km/h) | 34.63 mph (55.74 km/h) |
| 40 mph (64.37 km/h) | 39.58 mph (63.7 km/h) |
| 45 mph (72.42 km/h) | 44.53 mph (71.66 km/h) |
| 50 mph (80.47 km/h) | 49.48 mph (79.63 km/h) |
| 55 mph (88.51 km/h) | 54.42 mph (87.59 km/h) |
| 60 mph (96.56 km/h) | 59.37 mph (95.55 km/h) |
| 65 mph (104.61 km/h) | 64.32 mph (103.51 km/h) |
| 70 mph (112.65 km/h) | 69.27 mph (111.48 km/h) |
| 75 mph (120.7 km/h) | 74.22 mph (119.44 km/h) |
| 80 mph (128.75 km/h) | 79.16 mph (127.4 km/h) |
| 85 mph (136.79 km/h) | 84.11 mph (135.36 km/h) |
| 90 mph (144.84 km/h) | 89.06 mph (143.33 km/h) |
| 95 mph (152.89 km/h) | 94.01 mph (151.29 km/h) |
| 100 mph (160.93 km/h) | 98.95 mph (159.25 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
