Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/80-17 | 235/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.76 (679.8) | 28.18 (715.7) | 1.41 (35.9) 5.3% |
| Width inches (mm) | 6.1 (155) | 9.25 (235) | 3.15 (80) 51.6% |
| Circum. inches (mm) | 84.08 (2135.65) | 88.52 (2248.44) | 4.44 (112.78) 5.3% |
| Sidewall Height inches (mm) | 4.88 (124) | 5.09 (129.25) | 0.21 (5.25) 4.2% |
| Revolutions per mile (km) | 753.56 (468.24) | 715.76 (444.75) | -37.8 (-23.49) -5% |
235/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.06 mph (33.89 km/h) |
| 25 mph (40.23 km/h) | 26.32 mph (42.36 km/h) |
| 30 mph (48.28 km/h) | 31.58 mph (50.83 km/h) |
| 35 mph (56.33 km/h) | 36.85 mph (59.3 km/h) |
| 40 mph (64.37 km/h) | 42.11 mph (67.77 km/h) |
| 45 mph (72.42 km/h) | 47.38 mph (76.25 km/h) |
| 50 mph (80.47 km/h) | 52.64 mph (84.72 km/h) |
| 55 mph (88.51 km/h) | 57.9 mph (93.19 km/h) |
| 60 mph (96.56 km/h) | 63.17 mph (101.66 km/h) |
| 65 mph (104.61 km/h) | 68.43 mph (110.13 km/h) |
| 70 mph (112.65 km/h) | 73.7 mph (118.6 km/h) |
| 75 mph (120.7 km/h) | 78.96 mph (127.08 km/h) |
| 80 mph (128.75 km/h) | 84.22 mph (135.55 km/h) |
| 85 mph (136.79 km/h) | 89.49 mph (144.02 km/h) |
| 90 mph (144.84 km/h) | 94.75 mph (152.49 km/h) |
| 95 mph (152.89 km/h) | 100.02 mph (160.96 km/h) |
| 100 mph (160.93 km/h) | 105.28 mph (169.43 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
