Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/60-18 | 255/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.32 (643.2) | 30.04 (763) | 4.72 (119.8) 18.6% |
| Width inches (mm) | 6.1 (155) | 10.04 (255) | 3.94 (100) 64.5% |
| Circum. inches (mm) | 79.55 (2020.67) | 94.37 (2397.04) | 14.82 (376.36) 18.6% |
| Sidewall Height inches (mm) | 3.66 (93) | 5.02 (127.5) | 1.36 (34.5) 37.1% |
| Revolutions per mile (km) | 796.44 (494.88) | 671.39 (417.18) | -125.05 (-77.7) -15.7% |
255/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.73 mph (38.18 km/h) |
| 25 mph (40.23 km/h) | 29.66 mph (47.73 km/h) |
| 30 mph (48.28 km/h) | 35.59 mph (57.27 km/h) |
| 35 mph (56.33 km/h) | 41.52 mph (66.82 km/h) |
| 40 mph (64.37 km/h) | 47.45 mph (76.36 km/h) |
| 45 mph (72.42 km/h) | 53.38 mph (85.91 km/h) |
| 50 mph (80.47 km/h) | 59.31 mph (95.45 km/h) |
| 55 mph (88.51 km/h) | 65.24 mph (105 km/h) |
| 60 mph (96.56 km/h) | 71.18 mph (114.55 km/h) |
| 65 mph (104.61 km/h) | 77.11 mph (124.09 km/h) |
| 70 mph (112.65 km/h) | 83.04 mph (133.64 km/h) |
| 75 mph (120.7 km/h) | 88.97 mph (143.18 km/h) |
| 80 mph (128.75 km/h) | 94.9 mph (152.73 km/h) |
| 85 mph (136.79 km/h) | 100.83 mph (162.27 km/h) |
| 90 mph (144.84 km/h) | 106.76 mph (171.82 km/h) |
| 95 mph (152.89 km/h) | 112.69 mph (181.36 km/h) |
| 100 mph (160.93 km/h) | 118.63 mph (190.91 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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