Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 165/80-17 | 235/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.39 (695.8) | 28.18 (715.7) | 0.78 (19.9) 2.9% |
| Width inches (mm) | 6.5 (165) | 9.25 (235) | 2.76 (70) 42.4% |
| Circum. inches (mm) | 86.06 (2185.92) | 88.52 (2248.44) | 2.46 (62.52) 2.9% |
| Sidewall Height inches (mm) | 5.2 (132) | 5.09 (129.25) | -0.11 (-2.75) -2.1% |
| Revolutions per mile (km) | 736.23 (457.47) | 715.76 (444.75) | -20.47 (-12.72) -2.8% |
235/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.57 mph (33.11 km/h) |
| 25 mph (40.23 km/h) | 25.72 mph (41.38 km/h) |
| 30 mph (48.28 km/h) | 30.86 mph (49.66 km/h) |
| 35 mph (56.33 km/h) | 36 mph (57.94 km/h) |
| 40 mph (64.37 km/h) | 41.14 mph (66.21 km/h) |
| 45 mph (72.42 km/h) | 46.29 mph (74.49 km/h) |
| 50 mph (80.47 km/h) | 51.43 mph (82.77 km/h) |
| 55 mph (88.51 km/h) | 56.57 mph (91.05 km/h) |
| 60 mph (96.56 km/h) | 61.72 mph (99.32 km/h) |
| 65 mph (104.61 km/h) | 66.86 mph (107.6 km/h) |
| 70 mph (112.65 km/h) | 72 mph (115.88 km/h) |
| 75 mph (120.7 km/h) | 77.15 mph (124.15 km/h) |
| 80 mph (128.75 km/h) | 82.29 mph (132.43 km/h) |
| 85 mph (136.79 km/h) | 87.43 mph (140.71 km/h) |
| 90 mph (144.84 km/h) | 92.57 mph (148.98 km/h) |
| 95 mph (152.89 km/h) | 97.72 mph (157.26 km/h) |
| 100 mph (160.93 km/h) | 102.86 mph (165.54 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
