Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 115/85-18 | 145/60-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.7 (652.7) | 24.85 (631.2) | -0.85 (-21.5) -3.3% |
| Width inches (mm) | 4.53 (115) | 5.71 (145) | 1.18 (30) 26.1% |
| Circum. inches (mm) | 80.73 (2050.52) | 78.07 (1982.97) | -2.66 (-67.54) -3.3% |
| Sidewall Height inches (mm) | 3.85 (97.75) | 3.43 (87) | -0.42 (-10.75) -11% |
| Revolutions per mile (km) | 784.85 (487.68) | 811.58 (504.29) | 26.73 (16.61) 3.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.34 mph (31.13 km/h) |
| 25 mph (40.23 km/h) | 24.18 mph (38.91 km/h) |
| 30 mph (48.28 km/h) | 29.01 mph (46.69 km/h) |
| 35 mph (56.33 km/h) | 33.85 mph (54.47 km/h) |
| 40 mph (64.37 km/h) | 38.68 mph (62.25 km/h) |
| 45 mph (72.42 km/h) | 43.52 mph (70.04 km/h) |
| 50 mph (80.47 km/h) | 48.35 mph (77.82 km/h) |
| 55 mph (88.51 km/h) | 53.19 mph (85.6 km/h) |
| 60 mph (96.56 km/h) | 58.02 mph (93.38 km/h) |
| 65 mph (104.61 km/h) | 62.86 mph (101.16 km/h) |
| 70 mph (112.65 km/h) | 67.69 mph (108.94 km/h) |
| 75 mph (120.7 km/h) | 72.53 mph (116.73 km/h) |
| 80 mph (128.75 km/h) | 77.36 mph (124.51 km/h) |
| 85 mph (136.79 km/h) | 82.2 mph (132.29 km/h) |
| 90 mph (144.84 km/h) | 87.04 mph (140.07 km/h) |
| 95 mph (152.89 km/h) | 91.87 mph (147.85 km/h) |
| 100 mph (160.93 km/h) | 96.71 mph (155.63 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2065 | 2399 | 2584 | 2698 | 2821 | 2909 | 3006 | 3120 | 3278 | 3436 | 3612 | 3753 | 4008 | 4289 | 4509 | 4649 | 4728 | 5018 | 5423 | 6301 |
Better Fuel Economy Factory Ratios Increased Power
