Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/50-20 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.04 (763) | 28.68 (728.5) | -1.36 (-34.5) -4.5% |
| Width inches (mm) | 10.04 (255) | 9.65 (245) | -0.39 (-10) -3.9% |
| Circum. inches (mm) | 94.37 (2397.04) | 90.1 (2288.65) | -4.27 (-108.38) -4.5% |
| Sidewall Height inches (mm) | 5.02 (127.5) | 4.34 (110.25) | -0.68 (-17.25) -13.5% |
| Revolutions per mile (km) | 671.39 (417.18) | 703.18 (436.94) | 31.8 (19.76) 4.7% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.1 mph (30.73 km/h) |
| 25 mph (40.23 km/h) | 23.87 mph (38.41 km/h) |
| 30 mph (48.28 km/h) | 28.64 mph (46.1 km/h) |
| 35 mph (56.33 km/h) | 33.42 mph (53.78 km/h) |
| 40 mph (64.37 km/h) | 38.19 mph (61.46 km/h) |
| 45 mph (72.42 km/h) | 42.97 mph (69.15 km/h) |
| 50 mph (80.47 km/h) | 47.74 mph (76.83 km/h) |
| 55 mph (88.51 km/h) | 52.51 mph (84.51 km/h) |
| 60 mph (96.56 km/h) | 57.29 mph (92.19 km/h) |
| 65 mph (104.61 km/h) | 62.06 mph (99.88 km/h) |
| 70 mph (112.65 km/h) | 66.83 mph (107.56 km/h) |
| 75 mph (120.7 km/h) | 71.61 mph (115.24 km/h) |
| 80 mph (128.75 km/h) | 76.38 mph (122.93 km/h) |
| 85 mph (136.79 km/h) | 81.16 mph (130.61 km/h) |
| 90 mph (144.84 km/h) | 85.93 mph (138.29 km/h) |
| 95 mph (152.89 km/h) | 90.7 mph (145.97 km/h) |
| 100 mph (160.93 km/h) | 95.48 mph (153.66 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
