Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 170/80-15 | 170/90-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.71 (653) | 27.05 (687) | 1.34 (34) 5.2% |
| Width inches (mm) | 6.69 (170) | 6.69 (170) | 0 (0) 0% |
| Circum. inches (mm) | 80.77 (2051.46) | 84.97 (2158.27) | 4.21 (106.81) 5.2% |
| Sidewall Height inches (mm) | 5.35 (136) | 6.02 (153) | 0.67 (17) 12.5% |
| Revolutions per mile (km) | 784.49 (487.46) | 745.66 (463.33) | -38.82 (-24.12) -4.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.04 mph (33.86 km/h) |
| 25 mph (40.23 km/h) | 26.3 mph (42.33 km/h) |
| 30 mph (48.28 km/h) | 31.56 mph (50.79 km/h) |
| 35 mph (56.33 km/h) | 36.82 mph (59.26 km/h) |
| 40 mph (64.37 km/h) | 42.08 mph (67.73 km/h) |
| 45 mph (72.42 km/h) | 47.34 mph (76.19 km/h) |
| 50 mph (80.47 km/h) | 52.6 mph (84.66 km/h) |
| 55 mph (88.51 km/h) | 57.86 mph (93.12 km/h) |
| 60 mph (96.56 km/h) | 63.12 mph (101.59 km/h) |
| 65 mph (104.61 km/h) | 68.38 mph (110.05 km/h) |
| 70 mph (112.65 km/h) | 73.64 mph (118.52 km/h) |
| 75 mph (120.7 km/h) | 78.91 mph (126.99 km/h) |
| 80 mph (128.75 km/h) | 84.17 mph (135.45 km/h) |
| 85 mph (136.79 km/h) | 89.43 mph (143.92 km/h) |
| 90 mph (144.84 km/h) | 94.69 mph (152.38 km/h) |
| 95 mph (152.89 km/h) | 99.95 mph (160.85 km/h) |
| 100 mph (160.93 km/h) | 105.21 mph (169.31 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1898 | 2204 | 2374 | 2479 | 2592 | 2673 | 2762 | 2867 | 3012 | 3157 | 3319 | 3448 | 3682 | 3940 | 4142 | 4272 | 4344 | 4611 | 4982 | 5790 |
Better Fuel Economy Factory Ratios Increased Power
