Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/60-18 | 225/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.5 (673.2) | 31.29 (794.7) | 4.78 (121.5) 18% |
| Width inches (mm) | 7.09 (180) | 8.86 (225) | 1.77 (45) 25% |
| Circum. inches (mm) | 83.26 (2114.92) | 98.29 (2496.62) | 15.03 (381.7) 18% |
| Sidewall Height inches (mm) | 4.25 (108) | 6.64 (168.75) | 2.39 (60.75) 56.3% |
| Revolutions per mile (km) | 760.95 (472.83) | 644.61 (400.54) | -116.34 (-72.29) -15.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.61 mph (38 km/h) |
| 25 mph (40.23 km/h) | 29.51 mph (47.5 km/h) |
| 30 mph (48.28 km/h) | 35.41 mph (56.99 km/h) |
| 35 mph (56.33 km/h) | 41.32 mph (66.49 km/h) |
| 40 mph (64.37 km/h) | 47.22 mph (75.99 km/h) |
| 45 mph (72.42 km/h) | 53.12 mph (85.49 km/h) |
| 50 mph (80.47 km/h) | 59.02 mph (94.99 km/h) |
| 55 mph (88.51 km/h) | 64.93 mph (104.49 km/h) |
| 60 mph (96.56 km/h) | 70.83 mph (113.99 km/h) |
| 65 mph (104.61 km/h) | 76.73 mph (123.49 km/h) |
| 70 mph (112.65 km/h) | 82.63 mph (132.99 km/h) |
| 75 mph (120.7 km/h) | 88.54 mph (142.49 km/h) |
| 80 mph (128.75 km/h) | 94.44 mph (151.98 km/h) |
| 85 mph (136.79 km/h) | 100.34 mph (161.48 km/h) |
| 90 mph (144.84 km/h) | 106.24 mph (170.98 km/h) |
| 95 mph (152.89 km/h) | 112.15 mph (180.48 km/h) |
| 100 mph (160.93 km/h) | 118.05 mph (189.98 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1640 | 1906 | 2052 | 2143 | 2241 | 2311 | 2387 | 2478 | 2604 | 2729 | 2869 | 2981 | 3183 | 3406 | 3581 | 3693 | 3755 | 3986 | 4307 | 5005 |
Better Fuel Economy Factory Ratios Increased Power
