Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 115/85-18 | 250/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.7 (652.7) | 30.8 (782.2) | 5.1 (129.5) 19.8% |
| Width inches (mm) | 4.53 (115) | 9.84 (250) | 5.31 (135) 117.4% |
| Circum. inches (mm) | 80.73 (2050.52) | 96.75 (2457.35) | 16.02 (406.84) 19.8% |
| Sidewall Height inches (mm) | 3.85 (97.75) | 6.4 (162.5) | 2.55 (64.75) 66.2% |
| Revolutions per mile (km) | 784.85 (487.68) | 654.91 (406.94) | -129.94 (-80.74) -16.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.97 mph (38.57 km/h) |
| 25 mph (40.23 km/h) | 29.96 mph (48.22 km/h) |
| 30 mph (48.28 km/h) | 35.95 mph (57.86 km/h) |
| 35 mph (56.33 km/h) | 41.94 mph (67.5 km/h) |
| 40 mph (64.37 km/h) | 47.94 mph (77.15 km/h) |
| 45 mph (72.42 km/h) | 53.93 mph (86.79 km/h) |
| 50 mph (80.47 km/h) | 59.92 mph (96.43 km/h) |
| 55 mph (88.51 km/h) | 65.91 mph (106.08 km/h) |
| 60 mph (96.56 km/h) | 71.9 mph (115.72 km/h) |
| 65 mph (104.61 km/h) | 77.9 mph (125.36 km/h) |
| 70 mph (112.65 km/h) | 83.89 mph (135.01 km/h) |
| 75 mph (120.7 km/h) | 89.88 mph (144.65 km/h) |
| 80 mph (128.75 km/h) | 95.87 mph (154.29 km/h) |
| 85 mph (136.79 km/h) | 101.86 mph (163.94 km/h) |
| 90 mph (144.84 km/h) | 107.86 mph (173.58 km/h) |
| 95 mph (152.89 km/h) | 113.85 mph (183.22 km/h) |
| 100 mph (160.93 km/h) | 119.84 mph (192.87 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1667 | 1936 | 2085 | 2177 | 2277 | 2347 | 2425 | 2518 | 2645 | 2773 | 2915 | 3028 | 3234 | 3461 | 3638 | 3752 | 3815 | 4050 | 4376 | 5085 |
Better Fuel Economy Factory Ratios Increased Power
