Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/85-18 | 180/80-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.37 (720.7) | 28.34 (719.8) | -0.04 (-0.9) -0.1% |
| Width inches (mm) | 6.1 (155) | 7.09 (180) | 0.98 (25) 16.1% |
| Circum. inches (mm) | 89.14 (2264.15) | 89.03 (2261.32) | -0.11 (-2.83) -0.1% |
| Sidewall Height inches (mm) | 5.19 (131.75) | 5.67 (144) | 0.48 (12.25) 9.3% |
| Revolutions per mile (km) | 710.8 (441.67) | 711.68 (442.22) | 0.89 (0.55) 0.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.98 mph (32.15 km/h) |
| 25 mph (40.23 km/h) | 24.97 mph (40.18 km/h) |
| 30 mph (48.28 km/h) | 29.96 mph (48.22 km/h) |
| 35 mph (56.33 km/h) | 34.96 mph (56.26 km/h) |
| 40 mph (64.37 km/h) | 39.95 mph (64.29 km/h) |
| 45 mph (72.42 km/h) | 44.94 mph (72.33 km/h) |
| 50 mph (80.47 km/h) | 49.94 mph (80.37 km/h) |
| 55 mph (88.51 km/h) | 54.93 mph (88.4 km/h) |
| 60 mph (96.56 km/h) | 59.93 mph (96.44 km/h) |
| 65 mph (104.61 km/h) | 64.92 mph (104.48 km/h) |
| 70 mph (112.65 km/h) | 69.91 mph (112.51 km/h) |
| 75 mph (120.7 km/h) | 74.91 mph (120.55 km/h) |
| 80 mph (128.75 km/h) | 79.9 mph (128.59 km/h) |
| 85 mph (136.79 km/h) | 84.89 mph (136.62 km/h) |
| 90 mph (144.84 km/h) | 89.89 mph (144.66 km/h) |
| 95 mph (152.89 km/h) | 94.88 mph (152.7 km/h) |
| 100 mph (160.93 km/h) | 99.88 mph (160.73 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1811 | 2104 | 2266 | 2366 | 2474 | 2551 | 2636 | 2736 | 2875 | 3013 | 3167 | 3291 | 3514 | 3761 | 3954 | 4077 | 4146 | 4401 | 4755 | 5526 |
Better Fuel Economy Factory Ratios Increased Power
