Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 255/45-18 | 235/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.04 (686.7) | 28.18 (715.7) | 1.14 (29) 4.2% |
| Width inches (mm) | 10.04 (255) | 9.25 (235) | -0.79 (-20) -7.8% |
| Circum. inches (mm) | 84.93 (2157.33) | 88.52 (2248.44) | 3.59 (91.11) 4.2% |
| Sidewall Height inches (mm) | 4.52 (114.75) | 5.09 (129.25) | 0.57 (14.5) 12.6% |
| Revolutions per mile (km) | 745.99 (463.53) | 715.76 (444.75) | -30.23 (-18.78) -4.1% |
235/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.84 mph (33.55 km/h) |
| 25 mph (40.23 km/h) | 26.06 mph (41.93 km/h) |
| 30 mph (48.28 km/h) | 31.27 mph (50.32 km/h) |
| 35 mph (56.33 km/h) | 36.48 mph (58.71 km/h) |
| 40 mph (64.37 km/h) | 41.69 mph (67.09 km/h) |
| 45 mph (72.42 km/h) | 46.9 mph (75.48 km/h) |
| 50 mph (80.47 km/h) | 52.11 mph (83.87 km/h) |
| 55 mph (88.51 km/h) | 57.32 mph (92.25 km/h) |
| 60 mph (96.56 km/h) | 62.53 mph (100.64 km/h) |
| 65 mph (104.61 km/h) | 67.75 mph (109.03 km/h) |
| 70 mph (112.65 km/h) | 72.96 mph (117.41 km/h) |
| 75 mph (120.7 km/h) | 78.17 mph (125.8 km/h) |
| 80 mph (128.75 km/h) | 83.38 mph (134.18 km/h) |
| 85 mph (136.79 km/h) | 88.59 mph (142.57 km/h) |
| 90 mph (144.84 km/h) | 93.8 mph (150.96 km/h) |
| 95 mph (152.89 km/h) | 99.01 mph (159.34 km/h) |
| 100 mph (160.93 km/h) | 104.22 mph (167.73 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
