Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/60-18 | 185/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.32 (643.2) | 27.47 (697.7) | 2.15 (54.5) 8.5% |
| Width inches (mm) | 6.1 (155) | 7.28 (185) | 1.18 (30) 19.4% |
| Circum. inches (mm) | 79.55 (2020.67) | 86.29 (2191.89) | 6.74 (171.22) 8.5% |
| Sidewall Height inches (mm) | 3.66 (93) | 4.73 (120.25) | 1.07 (27.25) 29.3% |
| Revolutions per mile (km) | 796.44 (494.88) | 734.23 (456.23) | -62.21 (-38.66) -7.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.69 mph (34.91 km/h) |
| 25 mph (40.23 km/h) | 27.12 mph (43.64 km/h) |
| 30 mph (48.28 km/h) | 32.54 mph (52.37 km/h) |
| 35 mph (56.33 km/h) | 37.97 mph (61.1 km/h) |
| 40 mph (64.37 km/h) | 43.39 mph (69.83 km/h) |
| 45 mph (72.42 km/h) | 48.81 mph (78.56 km/h) |
| 50 mph (80.47 km/h) | 54.24 mph (87.29 km/h) |
| 55 mph (88.51 km/h) | 59.66 mph (96.01 km/h) |
| 60 mph (96.56 km/h) | 65.08 mph (104.74 km/h) |
| 65 mph (104.61 km/h) | 70.51 mph (113.47 km/h) |
| 70 mph (112.65 km/h) | 75.93 mph (122.2 km/h) |
| 75 mph (120.7 km/h) | 81.35 mph (130.93 km/h) |
| 80 mph (128.75 km/h) | 86.78 mph (139.66 km/h) |
| 85 mph (136.79 km/h) | 92.2 mph (148.39 km/h) |
| 90 mph (144.84 km/h) | 97.63 mph (157.11 km/h) |
| 95 mph (152.89 km/h) | 103.05 mph (165.84 km/h) |
| 100 mph (160.93 km/h) | 108.47 mph (174.57 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1868 | 2171 | 2338 | 2441 | 2552 | 2632 | 2719 | 2823 | 2966 | 3109 | 3268 | 3395 | 3626 | 3880 | 4079 | 4206 | 4278 | 4540 | 4906 | 5701 |
Better Fuel Economy Factory Ratios Increased Power
