Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/85-18 | 235/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.37 (720.7) | 28.18 (715.7) | -0.2 (-5) -0.7% |
| Width inches (mm) | 6.1 (155) | 9.25 (235) | 3.15 (80) 51.6% |
| Circum. inches (mm) | 89.14 (2264.15) | 88.52 (2248.44) | -0.62 (-15.71) -0.7% |
| Sidewall Height inches (mm) | 5.19 (131.75) | 5.09 (129.25) | -0.1 (-2.5) -1.9% |
| Revolutions per mile (km) | 710.8 (441.67) | 715.76 (444.75) | 4.97 (3.09) 0.7% |
235/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.86 mph (31.96 km/h) |
| 25 mph (40.23 km/h) | 24.83 mph (39.95 km/h) |
| 30 mph (48.28 km/h) | 29.79 mph (47.95 km/h) |
| 35 mph (56.33 km/h) | 34.76 mph (55.94 km/h) |
| 40 mph (64.37 km/h) | 39.72 mph (63.93 km/h) |
| 45 mph (72.42 km/h) | 44.69 mph (71.92 km/h) |
| 50 mph (80.47 km/h) | 49.65 mph (79.91 km/h) |
| 55 mph (88.51 km/h) | 54.62 mph (87.9 km/h) |
| 60 mph (96.56 km/h) | 59.58 mph (95.89 km/h) |
| 65 mph (104.61 km/h) | 64.55 mph (103.88 km/h) |
| 70 mph (112.65 km/h) | 69.51 mph (111.87 km/h) |
| 75 mph (120.7 km/h) | 74.48 mph (119.86 km/h) |
| 80 mph (128.75 km/h) | 79.44 mph (127.85 km/h) |
| 85 mph (136.79 km/h) | 84.41 mph (135.85 km/h) |
| 90 mph (144.84 km/h) | 89.38 mph (143.84 km/h) |
| 95 mph (152.89 km/h) | 94.34 mph (151.83 km/h) |
| 100 mph (160.93 km/h) | 99.31 mph (159.82 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
