Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/45-21 | 245/70-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.97 (735.9) | 30.5 (774.8) | 1.53 (38.9) 5.3% |
| Width inches (mm) | 8.86 (225) | 9.65 (245) | 0.79 (20) 8.9% |
| Circum. inches (mm) | 91.02 (2311.9) | 95.83 (2434.11) | 4.81 (122.21) 5.3% |
| Sidewall Height inches (mm) | 3.99 (101.25) | 6.75 (171.5) | 2.77 (70.25) 69.4% |
| Revolutions per mile (km) | 696.11 (432.54) | 661.16 (410.83) | -34.95 (-21.72) -5% |
245/70-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.06 mph (33.89 km/h) |
| 25 mph (40.23 km/h) | 26.32 mph (42.36 km/h) |
| 30 mph (48.28 km/h) | 31.59 mph (50.83 km/h) |
| 35 mph (56.33 km/h) | 36.85 mph (59.3 km/h) |
| 40 mph (64.37 km/h) | 42.11 mph (67.78 km/h) |
| 45 mph (72.42 km/h) | 47.38 mph (76.25 km/h) |
| 50 mph (80.47 km/h) | 52.64 mph (84.72 km/h) |
| 55 mph (88.51 km/h) | 57.91 mph (93.19 km/h) |
| 60 mph (96.56 km/h) | 63.17 mph (101.67 km/h) |
| 65 mph (104.61 km/h) | 68.44 mph (110.14 km/h) |
| 70 mph (112.65 km/h) | 73.7 mph (118.61 km/h) |
| 75 mph (120.7 km/h) | 78.96 mph (127.08 km/h) |
| 80 mph (128.75 km/h) | 84.23 mph (135.55 km/h) |
| 85 mph (136.79 km/h) | 89.49 mph (144.03 km/h) |
| 90 mph (144.84 km/h) | 94.76 mph (152.5 km/h) |
| 95 mph (152.89 km/h) | 100.02 mph (160.97 km/h) |
| 100 mph (160.93 km/h) | 105.29 mph (169.44 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1683 | 1955 | 2105 | 2198 | 2298 | 2370 | 2449 | 2542 | 2671 | 2799 | 2943 | 3057 | 3265 | 3494 | 3673 | 3787 | 3852 | 4088 | 4418 | 5134 |
Better Fuel Economy Factory Ratios Increased Power
