Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/40-20 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.4 (696) | 28.68 (728.5) | 1.28 (32.5) 4.7% |
| Width inches (mm) | 9.25 (235) | 9.65 (245) | 0.39 (10) 4.3% |
| Circum. inches (mm) | 86.08 (2186.55) | 90.1 (2288.65) | 4.02 (102.1) 4.7% |
| Sidewall Height inches (mm) | 3.7 (94) | 4.34 (110.25) | 0.64 (16.25) 17.3% |
| Revolutions per mile (km) | 736.02 (457.34) | 703.18 (436.94) | -32.84 (-20.4) -4.5% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.93 mph (33.69 km/h) |
| 25 mph (40.23 km/h) | 26.17 mph (42.11 km/h) |
| 30 mph (48.28 km/h) | 31.4 mph (50.53 km/h) |
| 35 mph (56.33 km/h) | 36.63 mph (58.96 km/h) |
| 40 mph (64.37 km/h) | 41.87 mph (67.38 km/h) |
| 45 mph (72.42 km/h) | 47.1 mph (75.8 km/h) |
| 50 mph (80.47 km/h) | 52.33 mph (84.22 km/h) |
| 55 mph (88.51 km/h) | 57.57 mph (92.65 km/h) |
| 60 mph (96.56 km/h) | 62.8 mph (101.07 km/h) |
| 65 mph (104.61 km/h) | 68.04 mph (109.49 km/h) |
| 70 mph (112.65 km/h) | 73.27 mph (117.91 km/h) |
| 75 mph (120.7 km/h) | 78.5 mph (126.34 km/h) |
| 80 mph (128.75 km/h) | 83.74 mph (134.76 km/h) |
| 85 mph (136.79 km/h) | 88.97 mph (143.18 km/h) |
| 90 mph (144.84 km/h) | 94.2 mph (151.6 km/h) |
| 95 mph (152.89 km/h) | 99.44 mph (160.03 km/h) |
| 100 mph (160.93 km/h) | 104.67 mph (168.45 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
