Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/70-20 | 305/70-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.09 (739) | 33.81 (858.8) | 4.72 (119.8) 16.2% |
| Width inches (mm) | 6.5 (165) | 12.01 (305) | 5.51 (140) 84.8% |
| Circum. inches (mm) | 91.4 (2321.64) | 106.22 (2698) | 14.82 (376.36) 16.2% |
| Sidewall Height inches (mm) | 4.55 (115.5) | 8.41 (213.5) | 3.86 (98) 84.8% |
| Revolutions per mile (km) | 693.19 (430.73) | 596.5 (370.64) | -96.7 (-60.09) -13.9% |
305/70-17 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.24 mph (37.4 km/h) |
| 25 mph (40.23 km/h) | 29.05 mph (46.76 km/h) |
| 30 mph (48.28 km/h) | 34.86 mph (56.11 km/h) |
| 35 mph (56.33 km/h) | 40.67 mph (65.46 km/h) |
| 40 mph (64.37 km/h) | 46.48 mph (74.81 km/h) |
| 45 mph (72.42 km/h) | 52.29 mph (84.16 km/h) |
| 50 mph (80.47 km/h) | 58.11 mph (93.51 km/h) |
| 55 mph (88.51 km/h) | 63.92 mph (102.86 km/h) |
| 60 mph (96.56 km/h) | 69.73 mph (112.21 km/h) |
| 65 mph (104.61 km/h) | 75.54 mph (121.57 km/h) |
| 70 mph (112.65 km/h) | 81.35 mph (130.92 km/h) |
| 75 mph (120.7 km/h) | 87.16 mph (140.27 km/h) |
| 80 mph (128.75 km/h) | 92.97 mph (149.62 km/h) |
| 85 mph (136.79 km/h) | 98.78 mph (158.97 km/h) |
| 90 mph (144.84 km/h) | 104.59 mph (168.32 km/h) |
| 95 mph (152.89 km/h) | 110.4 mph (177.67 km/h) |
| 100 mph (160.93 km/h) | 116.21 mph (187.02 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1518 | 1763 | 1899 | 1983 | 2073 | 2138 | 2209 | 2293 | 2409 | 2526 | 2655 | 2758 | 2946 | 3152 | 3314 | 3417 | 3475 | 3688 | 3985 | 4631 |
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