Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 225/65-18 | 235/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.52 (749.7) | 28.18 (715.7) | -1.34 (-34) -4.5% |
| Width inches (mm) | 8.86 (225) | 9.25 (235) | 0.39 (10) 4.4% |
| Circum. inches (mm) | 92.73 (2355.25) | 88.52 (2248.44) | -4.21 (-106.81) -4.5% |
| Sidewall Height inches (mm) | 5.76 (146.25) | 5.09 (129.25) | -0.67 (-17) -11.6% |
| Revolutions per mile (km) | 683.3 (424.58) | 715.76 (444.75) | 32.46 (20.17) 4.8% |
235/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.09 mph (30.73 km/h) |
| 25 mph (40.23 km/h) | 23.87 mph (38.41 km/h) |
| 30 mph (48.28 km/h) | 28.64 mph (46.09 km/h) |
| 35 mph (56.33 km/h) | 33.41 mph (53.77 km/h) |
| 40 mph (64.37 km/h) | 38.19 mph (61.45 km/h) |
| 45 mph (72.42 km/h) | 42.96 mph (69.14 km/h) |
| 50 mph (80.47 km/h) | 47.73 mph (76.82 km/h) |
| 55 mph (88.51 km/h) | 52.51 mph (84.5 km/h) |
| 60 mph (96.56 km/h) | 57.28 mph (92.18 km/h) |
| 65 mph (104.61 km/h) | 62.05 mph (99.86 km/h) |
| 70 mph (112.65 km/h) | 66.83 mph (107.55 km/h) |
| 75 mph (120.7 km/h) | 71.6 mph (115.23 km/h) |
| 80 mph (128.75 km/h) | 76.37 mph (122.91 km/h) |
| 85 mph (136.79 km/h) | 81.15 mph (130.59 km/h) |
| 90 mph (144.84 km/h) | 85.92 mph (138.27 km/h) |
| 95 mph (152.89 km/h) | 90.69 mph (145.95 km/h) |
| 100 mph (160.93 km/h) | 95.46 mph (153.64 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
