Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 115/85-18 | 155/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.7 (652.7) | 26.54 (674.2) | 0.85 (21.5) 3.3% |
| Width inches (mm) | 4.53 (115) | 6.1 (155) | 1.57 (40) 34.8% |
| Circum. inches (mm) | 80.73 (2050.52) | 83.39 (2118.06) | 2.66 (67.54) 3.3% |
| Sidewall Height inches (mm) | 3.85 (97.75) | 4.27 (108.5) | 0.42 (10.75) 11% |
| Revolutions per mile (km) | 784.85 (487.68) | 759.82 (472.13) | -25.03 (-15.55) -3.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.66 mph (33.25 km/h) |
| 25 mph (40.23 km/h) | 25.82 mph (41.56 km/h) |
| 30 mph (48.28 km/h) | 30.99 mph (49.87 km/h) |
| 35 mph (56.33 km/h) | 36.15 mph (58.18 km/h) |
| 40 mph (64.37 km/h) | 41.32 mph (66.49 km/h) |
| 45 mph (72.42 km/h) | 46.48 mph (74.81 km/h) |
| 50 mph (80.47 km/h) | 51.65 mph (83.12 km/h) |
| 55 mph (88.51 km/h) | 56.81 mph (91.43 km/h) |
| 60 mph (96.56 km/h) | 61.98 mph (99.74 km/h) |
| 65 mph (104.61 km/h) | 67.14 mph (108.05 km/h) |
| 70 mph (112.65 km/h) | 72.31 mph (116.37 km/h) |
| 75 mph (120.7 km/h) | 77.47 mph (124.68 km/h) |
| 80 mph (128.75 km/h) | 82.64 mph (132.99 km/h) |
| 85 mph (136.79 km/h) | 87.8 mph (141.3 km/h) |
| 90 mph (144.84 km/h) | 92.96 mph (149.61 km/h) |
| 95 mph (152.89 km/h) | 98.13 mph (157.92 km/h) |
| 100 mph (160.93 km/h) | 103.29 mph (166.24 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1934 | 2246 | 2419 | 2526 | 2641 | 2723 | 2814 | 2921 | 3069 | 3217 | 3382 | 3513 | 3752 | 4015 | 4221 | 4353 | 4427 | 4698 | 5077 | 5900 |
Better Fuel Economy Factory Ratios Increased Power
