Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/60-18 | 185/65-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.5 (673.2) | 27.47 (697.7) | 0.96 (24.5) 3.6% |
| Width inches (mm) | 7.09 (180) | 7.28 (185) | 0.2 (5) 2.8% |
| Circum. inches (mm) | 83.26 (2114.92) | 86.29 (2191.89) | 3.03 (76.97) 3.6% |
| Sidewall Height inches (mm) | 4.25 (108) | 4.73 (120.25) | 0.48 (12.25) 11.3% |
| Revolutions per mile (km) | 760.95 (472.83) | 734.23 (456.23) | -26.72 (-16.6) -3.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.73 mph (33.36 km/h) |
| 25 mph (40.23 km/h) | 25.91 mph (41.7 km/h) |
| 30 mph (48.28 km/h) | 31.09 mph (50.04 km/h) |
| 35 mph (56.33 km/h) | 36.27 mph (58.38 km/h) |
| 40 mph (64.37 km/h) | 41.46 mph (66.72 km/h) |
| 45 mph (72.42 km/h) | 46.64 mph (75.06 km/h) |
| 50 mph (80.47 km/h) | 51.82 mph (83.4 km/h) |
| 55 mph (88.51 km/h) | 57 mph (91.74 km/h) |
| 60 mph (96.56 km/h) | 62.18 mph (100.07 km/h) |
| 65 mph (104.61 km/h) | 67.37 mph (108.41 km/h) |
| 70 mph (112.65 km/h) | 72.55 mph (116.75 km/h) |
| 75 mph (120.7 km/h) | 77.73 mph (125.09 km/h) |
| 80 mph (128.75 km/h) | 82.91 mph (133.43 km/h) |
| 85 mph (136.79 km/h) | 88.09 mph (141.77 km/h) |
| 90 mph (144.84 km/h) | 93.28 mph (150.11 km/h) |
| 95 mph (152.89 km/h) | 98.46 mph (158.45 km/h) |
| 100 mph (160.93 km/h) | 103.64 mph (166.79 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
