Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 195/40-18 | 195/20-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.14 (613.2) | 21.07 (535.2) | -3.07 (-78) -12.7% |
| Width inches (mm) | 7.68 (195) | 7.68 (195) | 0 (0) 0% |
| Circum. inches (mm) | 75.84 (1926.42) | 66.2 (1681.38) | -9.65 (-245.04) -12.7% |
| Sidewall Height inches (mm) | 3.07 (78) | 1.54 (39) | -1.54 (-39) -50% |
| Revolutions per mile (km) | 835.4 (519.1) | 957.16 (594.75) | 121.75 (75.65) 14.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.46 mph (28.09 km/h) |
| 25 mph (40.23 km/h) | 21.82 mph (35.12 km/h) |
| 30 mph (48.28 km/h) | 26.18 mph (42.14 km/h) |
| 35 mph (56.33 km/h) | 30.55 mph (49.16 km/h) |
| 40 mph (64.37 km/h) | 34.91 mph (56.19 km/h) |
| 45 mph (72.42 km/h) | 39.28 mph (63.21 km/h) |
| 50 mph (80.47 km/h) | 43.64 mph (70.23 km/h) |
| 55 mph (88.51 km/h) | 48 mph (77.25 km/h) |
| 60 mph (96.56 km/h) | 52.37 mph (84.28 km/h) |
| 65 mph (104.61 km/h) | 56.73 mph (91.3 km/h) |
| 70 mph (112.65 km/h) | 61.1 mph (98.32 km/h) |
| 75 mph (120.7 km/h) | 65.46 mph (105.35 km/h) |
| 80 mph (128.75 km/h) | 69.82 mph (112.37 km/h) |
| 85 mph (136.79 km/h) | 74.19 mph (119.39 km/h) |
| 90 mph (144.84 km/h) | 78.55 mph (126.42 km/h) |
| 95 mph (152.89 km/h) | 82.92 mph (133.44 km/h) |
| 100 mph (160.93 km/h) | 87.28 mph (140.46 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
