Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/40-20 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.03 (712) | 28.68 (728.5) | 0.65 (16.5) 2.3% |
| Width inches (mm) | 10.04 (255) | 9.65 (245) | -0.39 (-10) -3.9% |
| Circum. inches (mm) | 88.06 (2236.81) | 90.1 (2288.65) | 2.04 (51.84) 2.3% |
| Sidewall Height inches (mm) | 4.02 (102) | 4.34 (110.25) | 0.32 (8.25) 8.1% |
| Revolutions per mile (km) | 719.48 (447.06) | 703.18 (436.94) | -16.3 (-10.13) -2.3% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.46 mph (32.93 km/h) |
| 25 mph (40.23 km/h) | 25.58 mph (41.17 km/h) |
| 30 mph (48.28 km/h) | 30.7 mph (49.4 km/h) |
| 35 mph (56.33 km/h) | 35.81 mph (57.63 km/h) |
| 40 mph (64.37 km/h) | 40.93 mph (65.87 km/h) |
| 45 mph (72.42 km/h) | 46.04 mph (74.1 km/h) |
| 50 mph (80.47 km/h) | 51.16 mph (82.33 km/h) |
| 55 mph (88.51 km/h) | 56.27 mph (90.57 km/h) |
| 60 mph (96.56 km/h) | 61.39 mph (98.8 km/h) |
| 65 mph (104.61 km/h) | 66.51 mph (107.03 km/h) |
| 70 mph (112.65 km/h) | 71.62 mph (115.26 km/h) |
| 75 mph (120.7 km/h) | 76.74 mph (123.5 km/h) |
| 80 mph (128.75 km/h) | 81.85 mph (131.73 km/h) |
| 85 mph (136.79 km/h) | 86.97 mph (139.96 km/h) |
| 90 mph (144.84 km/h) | 92.09 mph (148.2 km/h) |
| 95 mph (152.89 km/h) | 97.2 mph (156.43 km/h) |
| 100 mph (160.93 km/h) | 102.32 mph (164.66 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 |
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