Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 170/80-15 | 180/70-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.71 (653) | 24.92 (633) | -0.79 (-20) -3.1% |
| Width inches (mm) | 6.69 (170) | 7.09 (180) | 0.39 (10) 5.9% |
| Circum. inches (mm) | 80.77 (2051.46) | 78.29 (1988.63) | -2.47 (-62.83) -3.1% |
| Sidewall Height inches (mm) | 5.35 (136) | 4.96 (126) | -0.39 (-10) -7.4% |
| Revolutions per mile (km) | 784.49 (487.46) | 809.27 (502.86) | 24.79 (15.4) 3.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.39 mph (31.2 km/h) |
| 25 mph (40.23 km/h) | 24.23 mph (39 km/h) |
| 30 mph (48.28 km/h) | 29.08 mph (46.8 km/h) |
| 35 mph (56.33 km/h) | 33.93 mph (54.6 km/h) |
| 40 mph (64.37 km/h) | 38.77 mph (62.4 km/h) |
| 45 mph (72.42 km/h) | 43.62 mph (70.2 km/h) |
| 50 mph (80.47 km/h) | 48.47 mph (78 km/h) |
| 55 mph (88.51 km/h) | 53.32 mph (85.8 km/h) |
| 60 mph (96.56 km/h) | 58.16 mph (93.6 km/h) |
| 65 mph (104.61 km/h) | 63.01 mph (101.4 km/h) |
| 70 mph (112.65 km/h) | 67.86 mph (109.2 km/h) |
| 75 mph (120.7 km/h) | 72.7 mph (117 km/h) |
| 80 mph (128.75 km/h) | 77.55 mph (124.8 km/h) |
| 85 mph (136.79 km/h) | 82.4 mph (132.6 km/h) |
| 90 mph (144.84 km/h) | 87.24 mph (140.41 km/h) |
| 95 mph (152.89 km/h) | 92.09 mph (148.21 km/h) |
| 100 mph (160.93 km/h) | 96.94 mph (156.01 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2059 | 2392 | 2576 | 2690 | 2813 | 2901 | 2997 | 3111 | 3269 | 3427 | 3602 | 3742 | 3996 | 4277 | 4496 | 4636 | 4715 | 5004 | 5407 | 6284 |
Better Fuel Economy Factory Ratios Increased Power
