Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/55-20 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.04 (788.5) | 28.68 (728.5) | -2.36 (-60) -7.6% |
| Width inches (mm) | 10.04 (255) | 9.65 (245) | -0.39 (-10) -3.9% |
| Circum. inches (mm) | 97.53 (2477.15) | 90.1 (2288.65) | -7.42 (-188.5) -7.6% |
| Sidewall Height inches (mm) | 5.52 (140.25) | 4.34 (110.25) | -1.18 (-30) -21.4% |
| Revolutions per mile (km) | 649.68 (403.69) | 703.18 (436.94) | 53.51 (33.25) 8.2% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.48 mph (29.74 km/h) |
| 25 mph (40.23 km/h) | 23.1 mph (37.17 km/h) |
| 30 mph (48.28 km/h) | 27.72 mph (44.61 km/h) |
| 35 mph (56.33 km/h) | 32.34 mph (52.04 km/h) |
| 40 mph (64.37 km/h) | 36.96 mph (59.48 km/h) |
| 45 mph (72.42 km/h) | 41.58 mph (66.91 km/h) |
| 50 mph (80.47 km/h) | 46.2 mph (74.34 km/h) |
| 55 mph (88.51 km/h) | 50.81 mph (81.78 km/h) |
| 60 mph (96.56 km/h) | 55.43 mph (89.21 km/h) |
| 65 mph (104.61 km/h) | 60.05 mph (96.65 km/h) |
| 70 mph (112.65 km/h) | 64.67 mph (104.08 km/h) |
| 75 mph (120.7 km/h) | 69.29 mph (111.52 km/h) |
| 80 mph (128.75 km/h) | 73.91 mph (118.95 km/h) |
| 85 mph (136.79 km/h) | 78.53 mph (126.39 km/h) |
| 90 mph (144.84 km/h) | 83.15 mph (133.82 km/h) |
| 95 mph (152.89 km/h) | 87.77 mph (141.25 km/h) |
| 100 mph (160.93 km/h) | 92.39 mph (148.69 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
