Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/55-18 | 180/90-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.8 (655.2) | 30.76 (781.2) | 4.96 (126) 19.2% |
| Width inches (mm) | 7.09 (180) | 7.09 (180) | 0 (0) 0% |
| Circum. inches (mm) | 81.04 (2058.37) | 96.62 (2454.21) | 15.58 (395.84) 19.2% |
| Sidewall Height inches (mm) | 3.9 (99) | 6.38 (162) | 2.48 (63) 63.6% |
| Revolutions per mile (km) | 781.85 (485.82) | 655.75 (407.46) | -126.11 (-78.36) -16.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.85 mph (38.38 km/h) |
| 25 mph (40.23 km/h) | 29.81 mph (47.97 km/h) |
| 30 mph (48.28 km/h) | 35.77 mph (57.57 km/h) |
| 35 mph (56.33 km/h) | 41.73 mph (67.16 km/h) |
| 40 mph (64.37 km/h) | 47.69 mph (76.75 km/h) |
| 45 mph (72.42 km/h) | 53.65 mph (86.35 km/h) |
| 50 mph (80.47 km/h) | 59.62 mph (95.94 km/h) |
| 55 mph (88.51 km/h) | 65.58 mph (105.54 km/h) |
| 60 mph (96.56 km/h) | 71.54 mph (115.13 km/h) |
| 65 mph (104.61 km/h) | 77.5 mph (124.72 km/h) |
| 70 mph (112.65 km/h) | 83.46 mph (134.32 km/h) |
| 75 mph (120.7 km/h) | 89.42 mph (143.91 km/h) |
| 80 mph (128.75 km/h) | 95.38 mph (153.51 km/h) |
| 85 mph (136.79 km/h) | 101.35 mph (163.1 km/h) |
| 90 mph (144.84 km/h) | 107.31 mph (172.7 km/h) |
| 95 mph (152.89 km/h) | 113.27 mph (182.29 km/h) |
| 100 mph (160.93 km/h) | 119.23 mph (191.88 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1669 | 1939 | 2088 | 2180 | 2279 | 2350 | 2429 | 2521 | 2649 | 2777 | 2919 | 3032 | 3238 | 3465 | 3643 | 3756 | 3820 | 4055 | 4381 | 5091 |
Better Fuel Economy Factory Ratios Increased Power
