Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/30-21 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.79 (680.4) | 28.68 (728.5) | 1.89 (48.1) 7.1% |
| Width inches (mm) | 9.65 (245) | 9.65 (245) | 0 (0) 0% |
| Circum. inches (mm) | 84.16 (2137.54) | 90.1 (2288.65) | 5.95 (151.11) 7.1% |
| Sidewall Height inches (mm) | 2.89 (73.5) | 4.34 (110.25) | 1.45 (36.75) 50% |
| Revolutions per mile (km) | 752.9 (467.83) | 703.18 (436.94) | -49.71 (-30.89) -6.6% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.41 mph (34.46 km/h) |
| 25 mph (40.23 km/h) | 26.77 mph (43.08 km/h) |
| 30 mph (48.28 km/h) | 32.12 mph (51.69 km/h) |
| 35 mph (56.33 km/h) | 37.47 mph (60.31 km/h) |
| 40 mph (64.37 km/h) | 42.83 mph (68.92 km/h) |
| 45 mph (72.42 km/h) | 48.18 mph (77.54 km/h) |
| 50 mph (80.47 km/h) | 53.53 mph (86.16 km/h) |
| 55 mph (88.51 km/h) | 58.89 mph (94.77 km/h) |
| 60 mph (96.56 km/h) | 64.24 mph (103.39 km/h) |
| 65 mph (104.61 km/h) | 69.6 mph (112 km/h) |
| 70 mph (112.65 km/h) | 74.95 mph (120.62 km/h) |
| 75 mph (120.7 km/h) | 80.3 mph (129.23 km/h) |
| 80 mph (128.75 km/h) | 85.66 mph (137.85 km/h) |
| 85 mph (136.79 km/h) | 91.01 mph (146.47 km/h) |
| 90 mph (144.84 km/h) | 96.36 mph (155.08 km/h) |
| 95 mph (152.89 km/h) | 101.72 mph (163.7 km/h) |
| 100 mph (160.93 km/h) | 107.07 mph (172.31 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
