Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/70-18 | 235/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.95 (786.2) | 28.18 (715.7) | -2.78 (-70.5) -9% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 97.24 (2469.92) | 88.52 (2248.44) | -8.72 (-221.48) -9% |
| Sidewall Height inches (mm) | 6.48 (164.5) | 5.09 (129.25) | -1.39 (-35.25) -21.4% |
| Revolutions per mile (km) | 651.58 (404.87) | 715.76 (444.75) | 64.18 (39.88) 9.9% |
235/55-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.21 mph (29.3 km/h) |
| 25 mph (40.23 km/h) | 22.76 mph (36.63 km/h) |
| 30 mph (48.28 km/h) | 27.31 mph (43.95 km/h) |
| 35 mph (56.33 km/h) | 31.86 mph (51.28 km/h) |
| 40 mph (64.37 km/h) | 36.41 mph (58.6 km/h) |
| 45 mph (72.42 km/h) | 40.96 mph (65.93 km/h) |
| 50 mph (80.47 km/h) | 45.52 mph (73.25 km/h) |
| 55 mph (88.51 km/h) | 50.07 mph (80.58 km/h) |
| 60 mph (96.56 km/h) | 54.62 mph (87.9 km/h) |
| 65 mph (104.61 km/h) | 59.17 mph (95.23 km/h) |
| 70 mph (112.65 km/h) | 63.72 mph (102.55 km/h) |
| 75 mph (120.7 km/h) | 68.27 mph (109.88 km/h) |
| 80 mph (128.75 km/h) | 72.83 mph (117.2 km/h) |
| 85 mph (136.79 km/h) | 77.38 mph (124.53 km/h) |
| 90 mph (144.84 km/h) | 81.93 mph (131.85 km/h) |
| 95 mph (152.89 km/h) | 86.48 mph (139.18 km/h) |
| 100 mph (160.93 km/h) | 91.03 mph (146.5 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
