Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/50-17 | 235/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.25 (666.8) | 28.18 (715.7) | 1.93 (48.9) 7.3% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 82.47 (2094.81) | 88.52 (2248.44) | 6.05 (153.62) 7.3% |
| Sidewall Height inches (mm) | 4.63 (117.5) | 5.09 (129.25) | 0.46 (11.75) 10% |
| Revolutions per mile (km) | 768.25 (477.37) | 715.76 (444.75) | -52.49 (-32.62) -6.8% |
235/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.47 mph (34.55 km/h) |
| 25 mph (40.23 km/h) | 26.83 mph (43.18 km/h) |
| 30 mph (48.28 km/h) | 32.2 mph (51.82 km/h) |
| 35 mph (56.33 km/h) | 37.57 mph (60.46 km/h) |
| 40 mph (64.37 km/h) | 42.93 mph (69.09 km/h) |
| 45 mph (72.42 km/h) | 48.3 mph (77.73 km/h) |
| 50 mph (80.47 km/h) | 53.67 mph (86.37 km/h) |
| 55 mph (88.51 km/h) | 59.03 mph (95.01 km/h) |
| 60 mph (96.56 km/h) | 64.4 mph (103.64 km/h) |
| 65 mph (104.61 km/h) | 69.77 mph (112.28 km/h) |
| 70 mph (112.65 km/h) | 75.13 mph (120.92 km/h) |
| 75 mph (120.7 km/h) | 80.5 mph (129.55 km/h) |
| 80 mph (128.75 km/h) | 85.87 mph (138.19 km/h) |
| 85 mph (136.79 km/h) | 91.23 mph (146.83 km/h) |
| 90 mph (144.84 km/h) | 96.6 mph (155.46 km/h) |
| 95 mph (152.89 km/h) | 101.97 mph (164.1 km/h) |
| 100 mph (160.93 km/h) | 107.33 mph (172.74 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1821 | 2116 | 2279 | 2380 | 2488 | 2566 | 2651 | 2752 | 2891 | 3031 | 3186 | 3310 | 3534 | 3782 | 3976 | 4100 | 4170 | 4426 | 4782 | 5557 |
Better Fuel Economy Factory Ratios Increased Power
