Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 155/70-18 | 155/20-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.54 (674.2) | 20.44 (519.2) | -6.1 (-155) -23% |
| Width inches (mm) | 6.1 (155) | 6.1 (155) | 0 (0) 0% |
| Circum. inches (mm) | 83.39 (2118.06) | 64.22 (1631.11) | -19.17 (-486.95) -23% |
| Sidewall Height inches (mm) | 4.27 (108.5) | 1.22 (31) | -3.05 (-77.5) -71.4% |
| Revolutions per mile (km) | 759.82 (472.13) | 986.65 (613.08) | 226.83 (140.95) 29.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 15.4 mph (24.79 km/h) |
| 25 mph (40.23 km/h) | 19.25 mph (30.98 km/h) |
| 30 mph (48.28 km/h) | 23.1 mph (37.18 km/h) |
| 35 mph (56.33 km/h) | 26.95 mph (43.38 km/h) |
| 40 mph (64.37 km/h) | 30.8 mph (49.57 km/h) |
| 45 mph (72.42 km/h) | 34.65 mph (55.77 km/h) |
| 50 mph (80.47 km/h) | 38.5 mph (61.97 km/h) |
| 55 mph (88.51 km/h) | 42.36 mph (68.16 km/h) |
| 60 mph (96.56 km/h) | 46.21 mph (74.36 km/h) |
| 65 mph (104.61 km/h) | 50.06 mph (80.56 km/h) |
| 70 mph (112.65 km/h) | 53.91 mph (86.75 km/h) |
| 75 mph (120.7 km/h) | 57.76 mph (92.95 km/h) |
| 80 mph (128.75 km/h) | 61.61 mph (99.15 km/h) |
| 85 mph (136.79 km/h) | 65.46 mph (105.35 km/h) |
| 90 mph (144.84 km/h) | 69.31 mph (111.54 km/h) |
| 95 mph (152.89 km/h) | 73.16 mph (117.74 km/h) |
| 100 mph (160.93 km/h) | 77.01 mph (123.94 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Better Fuel Economy Factory Ratios Increased Power
