Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/45-20 | 245/40-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.68 (728.5) | 27.72 (704) | -0.96 (-24.5) -3.4% |
| Width inches (mm) | 9.65 (245) | 9.65 (245) | 0 (0) 0% |
| Circum. inches (mm) | 90.1 (2288.65) | 87.07 (2211.68) | -3.03 (-76.97) -3.4% |
| Sidewall Height inches (mm) | 4.34 (110.25) | 3.86 (98) | -0.48 (-12.25) -11.1% |
| Revolutions per mile (km) | 703.18 (436.94) | 727.66 (452.14) | 24.47 (15.21) 3.5% |
245/40-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.33 mph (31.1 km/h) |
| 25 mph (40.23 km/h) | 24.16 mph (38.88 km/h) |
| 30 mph (48.28 km/h) | 28.99 mph (46.66 km/h) |
| 35 mph (56.33 km/h) | 33.82 mph (54.43 km/h) |
| 40 mph (64.37 km/h) | 38.65 mph (62.21 km/h) |
| 45 mph (72.42 km/h) | 43.49 mph (69.99 km/h) |
| 50 mph (80.47 km/h) | 48.32 mph (77.76 km/h) |
| 55 mph (88.51 km/h) | 53.15 mph (85.54 km/h) |
| 60 mph (96.56 km/h) | 57.98 mph (93.31 km/h) |
| 65 mph (104.61 km/h) | 62.81 mph (101.09 km/h) |
| 70 mph (112.65 km/h) | 67.65 mph (108.87 km/h) |
| 75 mph (120.7 km/h) | 72.48 mph (116.64 km/h) |
| 80 mph (128.75 km/h) | 77.31 mph (124.42 km/h) |
| 85 mph (136.79 km/h) | 82.14 mph (132.19 km/h) |
| 90 mph (144.84 km/h) | 86.97 mph (139.97 km/h) |
| 95 mph (152.89 km/h) | 91.81 mph (147.75 km/h) |
| 100 mph (160.93 km/h) | 96.64 mph (155.52 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1852 | 2151 | 2317 | 2419 | 2529 | 2608 | 2695 | 2797 | 2939 | 3081 | 3239 | 3365 | 3593 | 3845 | 4042 | 4168 | 4239 | 4499 | 4862 | 5650 |
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