Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/45-20 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.04 (737.5) | 28.68 (728.5) | -0.35 (-9) -1.2% |
| Width inches (mm) | 10.04 (255) | 9.65 (245) | -0.39 (-10) -3.9% |
| Circum. inches (mm) | 91.22 (2316.92) | 90.1 (2288.65) | -1.11 (-28.27) -1.2% |
| Sidewall Height inches (mm) | 4.52 (114.75) | 4.34 (110.25) | -0.18 (-4.5) -3.9% |
| Revolutions per mile (km) | 694.6 (431.61) | 703.18 (436.94) | 8.58 (5.33) 1.2% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.76 mph (31.79 km/h) |
| 25 mph (40.23 km/h) | 24.69 mph (39.74 km/h) |
| 30 mph (48.28 km/h) | 29.63 mph (47.69 km/h) |
| 35 mph (56.33 km/h) | 34.57 mph (55.64 km/h) |
| 40 mph (64.37 km/h) | 39.51 mph (63.59 km/h) |
| 45 mph (72.42 km/h) | 44.45 mph (71.54 km/h) |
| 50 mph (80.47 km/h) | 49.39 mph (79.49 km/h) |
| 55 mph (88.51 km/h) | 54.33 mph (87.43 km/h) |
| 60 mph (96.56 km/h) | 59.27 mph (95.38 km/h) |
| 65 mph (104.61 km/h) | 64.21 mph (103.33 km/h) |
| 70 mph (112.65 km/h) | 69.15 mph (111.28 km/h) |
| 75 mph (120.7 km/h) | 74.08 mph (119.23 km/h) |
| 80 mph (128.75 km/h) | 79.02 mph (127.18 km/h) |
| 85 mph (136.79 km/h) | 83.96 mph (135.13 km/h) |
| 90 mph (144.84 km/h) | 88.9 mph (143.07 km/h) |
| 95 mph (152.89 km/h) | 93.84 mph (151.02 km/h) |
| 100 mph (160.93 km/h) | 98.78 mph (158.97 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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