Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/60-18 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.57 (751.2) | 28.68 (728.5) | -0.89 (-22.7) -3% |
| Width inches (mm) | 9.65 (245) | 9.65 (245) | 0 (0) 0% |
| Circum. inches (mm) | 92.91 (2359.96) | 90.1 (2288.65) | -2.81 (-71.31) -3% |
| Sidewall Height inches (mm) | 5.79 (147) | 4.34 (110.25) | -1.45 (-36.75) -25% |
| Revolutions per mile (km) | 681.94 (423.73) | 703.18 (436.94) | 21.25 (13.2) 3.1% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.4 mph (31.21 km/h) |
| 25 mph (40.23 km/h) | 24.24 mph (39.02 km/h) |
| 30 mph (48.28 km/h) | 29.09 mph (46.82 km/h) |
| 35 mph (56.33 km/h) | 33.94 mph (54.63 km/h) |
| 40 mph (64.37 km/h) | 38.79 mph (62.43 km/h) |
| 45 mph (72.42 km/h) | 43.64 mph (70.23 km/h) |
| 50 mph (80.47 km/h) | 48.49 mph (78.04 km/h) |
| 55 mph (88.51 km/h) | 53.34 mph (85.84 km/h) |
| 60 mph (96.56 km/h) | 58.19 mph (93.64 km/h) |
| 65 mph (104.61 km/h) | 63.04 mph (101.45 km/h) |
| 70 mph (112.65 km/h) | 67.88 mph (109.25 km/h) |
| 75 mph (120.7 km/h) | 72.73 mph (117.05 km/h) |
| 80 mph (128.75 km/h) | 77.58 mph (124.86 km/h) |
| 85 mph (136.79 km/h) | 82.43 mph (132.66 km/h) |
| 90 mph (144.84 km/h) | 87.28 mph (140.46 km/h) |
| 95 mph (152.89 km/h) | 92.13 mph (148.27 km/h) |
| 100 mph (160.93 km/h) | 96.98 mph (156.07 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
