Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 170/80-15 | 170/85-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.71 (653) | 26.38 (670) | 0.67 (17) 2.6% |
| Width inches (mm) | 6.69 (170) | 6.69 (170) | 0 (0) 0% |
| Circum. inches (mm) | 80.77 (2051.46) | 82.87 (2104.87) | 2.1 (53.41) 2.6% |
| Sidewall Height inches (mm) | 5.35 (136) | 5.69 (144.5) | 0.33 (8.5) 6.3% |
| Revolutions per mile (km) | 784.49 (487.46) | 764.58 (475.09) | -19.9 (-12.37) -2.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.52 mph (33.02 km/h) |
| 25 mph (40.23 km/h) | 25.65 mph (41.28 km/h) |
| 30 mph (48.28 km/h) | 30.78 mph (49.54 km/h) |
| 35 mph (56.33 km/h) | 35.91 mph (57.79 km/h) |
| 40 mph (64.37 km/h) | 41.04 mph (66.05 km/h) |
| 45 mph (72.42 km/h) | 46.17 mph (74.31 km/h) |
| 50 mph (80.47 km/h) | 51.3 mph (82.56 km/h) |
| 55 mph (88.51 km/h) | 56.43 mph (90.82 km/h) |
| 60 mph (96.56 km/h) | 61.56 mph (99.07 km/h) |
| 65 mph (104.61 km/h) | 66.69 mph (107.33 km/h) |
| 70 mph (112.65 km/h) | 71.82 mph (115.59 km/h) |
| 75 mph (120.7 km/h) | 76.95 mph (123.84 km/h) |
| 80 mph (128.75 km/h) | 82.08 mph (132.1 km/h) |
| 85 mph (136.79 km/h) | 87.21 mph (140.36 km/h) |
| 90 mph (144.84 km/h) | 92.34 mph (148.61 km/h) |
| 95 mph (152.89 km/h) | 97.47 mph (156.87 km/h) |
| 100 mph (160.93 km/h) | 102.6 mph (165.12 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1946 | 2260 | 2434 | 2542 | 2658 | 2741 | 2832 | 2939 | 3088 | 3237 | 3403 | 3535 | 3776 | 4040 | 4247 | 4380 | 4454 | 4728 | 5109 | 5937 |
Better Fuel Economy Factory Ratios Increased Power
