Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/45-20 | 255/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.04 (737.5) | 30.04 (763) | 1 (25.5) 3.5% |
| Width inches (mm) | 10.04 (255) | 10.04 (255) | 0 (0) 0% |
| Circum. inches (mm) | 91.22 (2316.92) | 94.37 (2397.04) | 3.15 (80.11) 3.5% |
| Sidewall Height inches (mm) | 4.52 (114.75) | 5.02 (127.5) | 0.5 (12.75) 11.1% |
| Revolutions per mile (km) | 694.6 (431.61) | 671.39 (417.18) | -23.21 (-14.42) -3.3% |
255/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.69 mph (33.3 km/h) |
| 25 mph (40.23 km/h) | 25.86 mph (41.62 km/h) |
| 30 mph (48.28 km/h) | 31.04 mph (49.95 km/h) |
| 35 mph (56.33 km/h) | 36.21 mph (58.27 km/h) |
| 40 mph (64.37 km/h) | 41.38 mph (66.6 km/h) |
| 45 mph (72.42 km/h) | 46.56 mph (74.92 km/h) |
| 50 mph (80.47 km/h) | 51.73 mph (83.25 km/h) |
| 55 mph (88.51 km/h) | 56.9 mph (91.57 km/h) |
| 60 mph (96.56 km/h) | 62.07 mph (99.9 km/h) |
| 65 mph (104.61 km/h) | 67.25 mph (108.22 km/h) |
| 70 mph (112.65 km/h) | 72.42 mph (116.55 km/h) |
| 75 mph (120.7 km/h) | 77.59 mph (124.87 km/h) |
| 80 mph (128.75 km/h) | 82.77 mph (133.2 km/h) |
| 85 mph (136.79 km/h) | 87.94 mph (141.52 km/h) |
| 90 mph (144.84 km/h) | 93.11 mph (149.85 km/h) |
| 95 mph (152.89 km/h) | 98.28 mph (158.17 km/h) |
| 100 mph (160.93 km/h) | 103.46 mph (166.5 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1709 | 1985 | 2138 | 2232 | 2334 | 2407 | 2486 | 2581 | 2712 | 2843 | 2988 | 3104 | 3315 | 3548 | 3730 | 3846 | 3912 | 4151 | 4486 | 5213 |
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