Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/40-20 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.72 (704) | 28.68 (728.5) | 0.96 (24.5) 3.5% |
| Width inches (mm) | 9.65 (245) | 9.65 (245) | 0 (0) 0% |
| Circum. inches (mm) | 87.07 (2211.68) | 90.1 (2288.65) | 3.03 (76.97) 3.5% |
| Sidewall Height inches (mm) | 3.86 (98) | 4.34 (110.25) | 0.48 (12.25) 12.5% |
| Revolutions per mile (km) | 727.66 (452.14) | 703.18 (436.94) | -24.47 (-15.21) -3.4% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.7 mph (33.31 km/h) |
| 25 mph (40.23 km/h) | 25.87 mph (41.63 km/h) |
| 30 mph (48.28 km/h) | 31.04 mph (49.96 km/h) |
| 35 mph (56.33 km/h) | 36.22 mph (58.29 km/h) |
| 40 mph (64.37 km/h) | 41.39 mph (66.61 km/h) |
| 45 mph (72.42 km/h) | 46.57 mph (74.94 km/h) |
| 50 mph (80.47 km/h) | 51.74 mph (83.27 km/h) |
| 55 mph (88.51 km/h) | 56.91 mph (91.59 km/h) |
| 60 mph (96.56 km/h) | 62.09 mph (99.92 km/h) |
| 65 mph (104.61 km/h) | 67.26 mph (108.25 km/h) |
| 70 mph (112.65 km/h) | 72.44 mph (116.57 km/h) |
| 75 mph (120.7 km/h) | 77.61 mph (124.9 km/h) |
| 80 mph (128.75 km/h) | 82.78 mph (133.23 km/h) |
| 85 mph (136.79 km/h) | 87.96 mph (141.56 km/h) |
| 90 mph (144.84 km/h) | 93.13 mph (149.88 km/h) |
| 95 mph (152.89 km/h) | 98.31 mph (158.21 km/h) |
| 100 mph (160.93 km/h) | 103.48 mph (166.54 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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