Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/60-18 | 385/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.32 (643.2) | 39.22 (996.2) | 13.9 (353) 54.9% |
| Width inches (mm) | 6.1 (155) | 15.16 (385) | 9.06 (230) 148.4% |
| Circum. inches (mm) | 79.55 (2020.67) | 123.21 (3129.65) | 43.66 (1108.98) 54.9% |
| Sidewall Height inches (mm) | 3.66 (93) | 10.61 (269.5) | 6.95 (176.5) 189.8% |
| Revolutions per mile (km) | 796.44 (494.88) | 514.22 (319.52) | -282.22 (-175.36) -35.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 30.98 mph (49.85 km/h) |
| 25 mph (40.23 km/h) | 38.72 mph (62.31 km/h) |
| 30 mph (48.28 km/h) | 46.46 mph (74.78 km/h) |
| 35 mph (56.33 km/h) | 54.21 mph (87.24 km/h) |
| 40 mph (64.37 km/h) | 61.95 mph (99.7 km/h) |
| 45 mph (72.42 km/h) | 69.7 mph (112.17 km/h) |
| 50 mph (80.47 km/h) | 77.44 mph (124.63 km/h) |
| 55 mph (88.51 km/h) | 85.19 mph (137.09 km/h) |
| 60 mph (96.56 km/h) | 92.93 mph (149.56 km/h) |
| 65 mph (104.61 km/h) | 100.67 mph (162.02 km/h) |
| 70 mph (112.65 km/h) | 108.42 mph (174.48 km/h) |
| 75 mph (120.7 km/h) | 116.16 mph (186.94 km/h) |
| 80 mph (128.75 km/h) | 123.91 mph (199.41 km/h) |
| 85 mph (136.79 km/h) | 131.65 mph (211.87 km/h) |
| 90 mph (144.84 km/h) | 139.39 mph (224.33 km/h) |
| 95 mph (152.89 km/h) | 147.14 mph (236.8 km/h) |
| 100 mph (160.93 km/h) | 154.88 mph (249.26 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1309 | 1520 | 1637 | 1710 | 1787 | 1843 | 1904 | 1977 | 2077 | 2177 | 2289 | 2378 | 2539 | 2717 | 2857 | 2946 | 2996 | 3180 | 3436 | 3993 |
Better Fuel Economy Factory Ratios Increased Power
