Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/70-18 | 255/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.54 (674.2) | 30.04 (763) | 3.5 (88.8) 13.2% |
| Width inches (mm) | 6.1 (155) | 10.04 (255) | 3.94 (100) 64.5% |
| Circum. inches (mm) | 83.39 (2118.06) | 94.37 (2397.04) | 10.98 (278.97) 13.2% |
| Sidewall Height inches (mm) | 4.27 (108.5) | 5.02 (127.5) | 0.75 (19) 17.5% |
| Revolutions per mile (km) | 759.82 (472.13) | 671.39 (417.18) | -88.43 (-54.95) -11.6% |
255/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.63 mph (36.43 km/h) |
| 25 mph (40.23 km/h) | 28.29 mph (45.53 km/h) |
| 30 mph (48.28 km/h) | 33.95 mph (54.64 km/h) |
| 35 mph (56.33 km/h) | 39.61 mph (63.75 km/h) |
| 40 mph (64.37 km/h) | 45.27 mph (72.85 km/h) |
| 45 mph (72.42 km/h) | 50.93 mph (81.96 km/h) |
| 50 mph (80.47 km/h) | 56.59 mph (91.07 km/h) |
| 55 mph (88.51 km/h) | 62.24 mph (100.17 km/h) |
| 60 mph (96.56 km/h) | 67.9 mph (109.28 km/h) |
| 65 mph (104.61 km/h) | 73.56 mph (118.39 km/h) |
| 70 mph (112.65 km/h) | 79.22 mph (127.49 km/h) |
| 75 mph (120.7 km/h) | 84.88 mph (136.6 km/h) |
| 80 mph (128.75 km/h) | 90.54 mph (145.71 km/h) |
| 85 mph (136.79 km/h) | 96.2 mph (154.81 km/h) |
| 90 mph (144.84 km/h) | 101.85 mph (163.92 km/h) |
| 95 mph (152.89 km/h) | 107.51 mph (173.03 km/h) |
| 100 mph (160.93 km/h) | 113.17 mph (182.13 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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