Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/60-18 | 255/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.57 (751.2) | 29.04 (737.5) | -0.54 (-13.7) -1.8% |
| Width inches (mm) | 9.65 (245) | 10.04 (255) | 0.39 (10) 4.1% |
| Circum. inches (mm) | 92.91 (2359.96) | 91.22 (2316.92) | -1.69 (-43.04) -1.8% |
| Sidewall Height inches (mm) | 5.79 (147) | 4.52 (114.75) | -1.27 (-32.25) -21.9% |
| Revolutions per mile (km) | 681.94 (423.73) | 694.6 (431.61) | 12.67 (7.87) 1.9% |
255/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.64 mph (31.6 km/h) |
| 25 mph (40.23 km/h) | 24.54 mph (39.5 km/h) |
| 30 mph (48.28 km/h) | 29.45 mph (47.4 km/h) |
| 35 mph (56.33 km/h) | 34.36 mph (55.3 km/h) |
| 40 mph (64.37 km/h) | 39.27 mph (63.2 km/h) |
| 45 mph (72.42 km/h) | 44.18 mph (71.1 km/h) |
| 50 mph (80.47 km/h) | 49.09 mph (79 km/h) |
| 55 mph (88.51 km/h) | 54 mph (86.9 km/h) |
| 60 mph (96.56 km/h) | 58.91 mph (94.8 km/h) |
| 65 mph (104.61 km/h) | 63.81 mph (102.7 km/h) |
| 70 mph (112.65 km/h) | 68.72 mph (110.6 km/h) |
| 75 mph (120.7 km/h) | 73.63 mph (118.5 km/h) |
| 80 mph (128.75 km/h) | 78.54 mph (126.4 km/h) |
| 85 mph (136.79 km/h) | 83.45 mph (134.3 km/h) |
| 90 mph (144.84 km/h) | 88.36 mph (142.2 km/h) |
| 95 mph (152.89 km/h) | 93.27 mph (150.1 km/h) |
| 100 mph (160.93 km/h) | 98.18 mph (158 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1768 | 2053 | 2211 | 2309 | 2415 | 2490 | 2572 | 2670 | 2806 | 2941 | 3091 | 3212 | 3430 | 3671 | 3859 | 3979 | 4047 | 4295 | 4641 | 5393 |
Better Fuel Economy Factory Ratios Increased Power
