Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/70-15 | 170/80-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.61 (549) | 25.71 (653) | 4.09 (104) 18.9% |
| Width inches (mm) | 4.72 (120) | 6.69 (170) | 1.97 (50) 41.7% |
| Circum. inches (mm) | 67.9 (1724.73) | 80.77 (2051.46) | 12.86 (326.73) 18.9% |
| Sidewall Height inches (mm) | 3.31 (84) | 5.35 (136) | 2.05 (52) 61.9% |
| Revolutions per mile (km) | 933.1 (579.8) | 784.49 (487.46) | -148.61 (-92.34) -15.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.79 mph (38.28 km/h) |
| 25 mph (40.23 km/h) | 29.74 mph (47.86 km/h) |
| 30 mph (48.28 km/h) | 35.68 mph (57.43 km/h) |
| 35 mph (56.33 km/h) | 41.63 mph (67 km/h) |
| 40 mph (64.37 km/h) | 47.58 mph (76.57 km/h) |
| 45 mph (72.42 km/h) | 53.52 mph (86.14 km/h) |
| 50 mph (80.47 km/h) | 59.47 mph (95.71 km/h) |
| 55 mph (88.51 km/h) | 65.42 mph (105.28 km/h) |
| 60 mph (96.56 km/h) | 71.37 mph (114.85 km/h) |
| 65 mph (104.61 km/h) | 77.31 mph (124.42 km/h) |
| 70 mph (112.65 km/h) | 83.26 mph (134 km/h) |
| 75 mph (120.7 km/h) | 89.21 mph (143.57 km/h) |
| 80 mph (128.75 km/h) | 95.15 mph (153.14 km/h) |
| 85 mph (136.79 km/h) | 101.1 mph (162.71 km/h) |
| 90 mph (144.84 km/h) | 107.05 mph (172.28 km/h) |
| 95 mph (152.89 km/h) | 113 mph (181.85 km/h) |
| 100 mph (160.93 km/h) | 118.94 mph (191.42 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1996 | 2319 | 2498 | 2608 | 2727 | 2812 | 2905 | 3016 | 3169 | 3322 | 3492 | 3627 | 3874 | 4146 | 4358 | 4494 | 4570 | 4851 | 5242 | 6091 |
Better Fuel Economy Factory Ratios Increased Power
