Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/90-18 | 235/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.98 (736.2) | 28.18 (715.7) | -0.81 (-20.5) -2.8% |
| Width inches (mm) | 6.1 (155) | 9.25 (235) | 3.15 (80) 51.6% |
| Circum. inches (mm) | 91.06 (2312.84) | 88.52 (2248.44) | -2.54 (-64.4) -2.8% |
| Sidewall Height inches (mm) | 5.49 (139.5) | 5.09 (129.25) | -0.4 (-10.25) -7.3% |
| Revolutions per mile (km) | 695.83 (432.37) | 715.76 (444.75) | 19.93 (12.38) 2.9% |
235/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.44 mph (31.29 km/h) |
| 25 mph (40.23 km/h) | 24.3 mph (39.11 km/h) |
| 30 mph (48.28 km/h) | 29.16 mph (46.94 km/h) |
| 35 mph (56.33 km/h) | 34.03 mph (54.76 km/h) |
| 40 mph (64.37 km/h) | 38.89 mph (62.58 km/h) |
| 45 mph (72.42 km/h) | 43.75 mph (70.4 km/h) |
| 50 mph (80.47 km/h) | 48.61 mph (78.23 km/h) |
| 55 mph (88.51 km/h) | 53.47 mph (86.05 km/h) |
| 60 mph (96.56 km/h) | 58.33 mph (93.87 km/h) |
| 65 mph (104.61 km/h) | 63.19 mph (101.69 km/h) |
| 70 mph (112.65 km/h) | 68.05 mph (109.52 km/h) |
| 75 mph (120.7 km/h) | 72.91 mph (117.34 km/h) |
| 80 mph (128.75 km/h) | 77.77 mph (125.16 km/h) |
| 85 mph (136.79 km/h) | 82.63 mph (132.99 km/h) |
| 90 mph (144.84 km/h) | 87.49 mph (140.81 km/h) |
| 95 mph (152.89 km/h) | 92.35 mph (148.63 km/h) |
| 100 mph (160.93 km/h) | 97.22 mph (156.45 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
