Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 235/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 28.18 (715.7) | -2.22 (-56.5) -7.3% |
| Width inches (mm) | 6.89 (175) | 9.25 (235) | 2.36 (60) 34.3% |
| Circum. inches (mm) | 95.51 (2425.94) | 88.52 (2248.44) | -6.99 (-177.5) -7.3% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 5.09 (129.25) | -1.11 (-28.25) -17.9% |
| Revolutions per mile (km) | 663.39 (412.21) | 715.76 (444.75) | 52.37 (32.54) 7.9% |
235/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.54 mph (29.83 km/h) |
| 25 mph (40.23 km/h) | 23.17 mph (37.29 km/h) |
| 30 mph (48.28 km/h) | 27.8 mph (44.75 km/h) |
| 35 mph (56.33 km/h) | 32.44 mph (52.21 km/h) |
| 40 mph (64.37 km/h) | 37.07 mph (59.66 km/h) |
| 45 mph (72.42 km/h) | 41.71 mph (67.12 km/h) |
| 50 mph (80.47 km/h) | 46.34 mph (74.58 km/h) |
| 55 mph (88.51 km/h) | 50.98 mph (82.04 km/h) |
| 60 mph (96.56 km/h) | 55.61 mph (89.5 km/h) |
| 65 mph (104.61 km/h) | 60.24 mph (96.95 km/h) |
| 70 mph (112.65 km/h) | 64.88 mph (104.41 km/h) |
| 75 mph (120.7 km/h) | 69.51 mph (111.87 km/h) |
| 80 mph (128.75 km/h) | 74.15 mph (119.33 km/h) |
| 85 mph (136.79 km/h) | 78.78 mph (126.79 km/h) |
| 90 mph (144.84 km/h) | 83.41 mph (134.24 km/h) |
| 95 mph (152.89 km/h) | 88.05 mph (141.7 km/h) |
| 100 mph (160.93 km/h) | 92.68 mph (149.16 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
