Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 125/85-16 | 235/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.37 (618.9) | 26.33 (668.7) | 1.96 (49.8) 8% |
| Width inches (mm) | 4.92 (125) | 9.25 (235) | 4.33 (110) 88% |
| Circum. inches (mm) | 76.55 (1944.33) | 82.71 (2100.78) | 6.16 (156.45) 8% |
| Sidewall Height inches (mm) | 4.18 (106.25) | 4.16 (105.75) | -0.02 (-0.5) -0.5% |
| Revolutions per mile (km) | 827.71 (514.31) | 766.07 (476.01) | -61.64 (-38.3) -7.4% |
235/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.61 mph (34.78 km/h) |
| 25 mph (40.23 km/h) | 27.01 mph (43.47 km/h) |
| 30 mph (48.28 km/h) | 32.41 mph (52.17 km/h) |
| 35 mph (56.33 km/h) | 37.82 mph (60.86 km/h) |
| 40 mph (64.37 km/h) | 43.22 mph (69.55 km/h) |
| 45 mph (72.42 km/h) | 48.62 mph (78.25 km/h) |
| 50 mph (80.47 km/h) | 54.02 mph (86.94 km/h) |
| 55 mph (88.51 km/h) | 59.43 mph (95.64 km/h) |
| 60 mph (96.56 km/h) | 64.83 mph (104.33 km/h) |
| 65 mph (104.61 km/h) | 70.23 mph (113.02 km/h) |
| 70 mph (112.65 km/h) | 75.63 mph (121.72 km/h) |
| 75 mph (120.7 km/h) | 81.03 mph (130.41 km/h) |
| 80 mph (128.75 km/h) | 86.44 mph (139.11 km/h) |
| 85 mph (136.79 km/h) | 91.84 mph (147.8 km/h) |
| 90 mph (144.84 km/h) | 97.24 mph (156.5 km/h) |
| 95 mph (152.89 km/h) | 102.64 mph (165.19 km/h) |
| 100 mph (160.93 km/h) | 108.05 mph (173.88 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1949 | 2265 | 2439 | 2547 | 2663 | 2746 | 2837 | 2945 | 3094 | 3244 | 3410 | 3542 | 3783 | 4048 | 4256 | 4388 | 4463 | 4737 | 5118 | 5948 |
Better Fuel Economy Factory Ratios Increased Power
