Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/55-18 | 245/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.61 (726.7) | 28.68 (728.5) | 0.07 (1.8) 0.2% |
| Width inches (mm) | 9.65 (245) | 9.65 (245) | 0 (0) 0% |
| Circum. inches (mm) | 89.88 (2283) | 90.1 (2288.65) | 0.22 (5.65) 0.2% |
| Sidewall Height inches (mm) | 5.31 (134.75) | 4.34 (110.25) | -0.96 (-24.5) -18.2% |
| Revolutions per mile (km) | 704.93 (438.02) | 703.18 (436.94) | -1.74 (-1.08) -0.2% |
245/45-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.05 mph (32.27 km/h) |
| 25 mph (40.23 km/h) | 25.06 mph (40.33 km/h) |
| 30 mph (48.28 km/h) | 30.07 mph (48.4 km/h) |
| 35 mph (56.33 km/h) | 35.09 mph (56.47 km/h) |
| 40 mph (64.37 km/h) | 40.1 mph (64.53 km/h) |
| 45 mph (72.42 km/h) | 45.11 mph (72.6 km/h) |
| 50 mph (80.47 km/h) | 50.12 mph (80.67 km/h) |
| 55 mph (88.51 km/h) | 55.14 mph (88.73 km/h) |
| 60 mph (96.56 km/h) | 60.15 mph (96.8 km/h) |
| 65 mph (104.61 km/h) | 65.16 mph (104.87 km/h) |
| 70 mph (112.65 km/h) | 70.17 mph (112.93 km/h) |
| 75 mph (120.7 km/h) | 75.19 mph (121 km/h) |
| 80 mph (128.75 km/h) | 80.2 mph (129.07 km/h) |
| 85 mph (136.79 km/h) | 85.21 mph (137.13 km/h) |
| 90 mph (144.84 km/h) | 90.22 mph (145.2 km/h) |
| 95 mph (152.89 km/h) | 95.24 mph (153.27 km/h) |
| 100 mph (160.93 km/h) | 100.25 mph (161.33 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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