Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/90-18 | 245/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.98 (736.2) | 29.65 (753) | 0.66 (16.8) 2.3% |
| Width inches (mm) | 6.1 (155) | 9.65 (245) | 3.54 (90) 58.1% |
| Circum. inches (mm) | 91.06 (2312.84) | 93.13 (2365.62) | 2.08 (52.78) 2.3% |
| Sidewall Height inches (mm) | 5.49 (139.5) | 4.82 (122.5) | -0.67 (-17) -12.2% |
| Revolutions per mile (km) | 695.83 (432.37) | 680.31 (422.72) | -15.52 (-9.65) -2.2% |
245/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.46 mph (32.92 km/h) |
| 25 mph (40.23 km/h) | 25.57 mph (41.15 km/h) |
| 30 mph (48.28 km/h) | 30.68 mph (49.38 km/h) |
| 35 mph (56.33 km/h) | 35.8 mph (57.61 km/h) |
| 40 mph (64.37 km/h) | 40.91 mph (65.84 km/h) |
| 45 mph (72.42 km/h) | 46.03 mph (74.07 km/h) |
| 50 mph (80.47 km/h) | 51.14 mph (82.3 km/h) |
| 55 mph (88.51 km/h) | 56.26 mph (90.53 km/h) |
| 60 mph (96.56 km/h) | 61.37 mph (98.76 km/h) |
| 65 mph (104.61 km/h) | 66.48 mph (106.99 km/h) |
| 70 mph (112.65 km/h) | 71.6 mph (115.23 km/h) |
| 75 mph (120.7 km/h) | 76.71 mph (123.46 km/h) |
| 80 mph (128.75 km/h) | 81.83 mph (131.69 km/h) |
| 85 mph (136.79 km/h) | 86.94 mph (139.92 km/h) |
| 90 mph (144.84 km/h) | 92.05 mph (148.15 km/h) |
| 95 mph (152.89 km/h) | 97.17 mph (156.38 km/h) |
| 100 mph (160.93 km/h) | 102.28 mph (164.61 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1731 | 2011 | 2166 | 2262 | 2365 | 2438 | 2520 | 2615 | 2748 | 2881 | 3028 | 3146 | 3359 | 3595 | 3779 | 3897 | 3963 | 4207 | 4545 | 5282 |
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