Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 195/40-18 | 245/30-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.14 (613.2) | 23.79 (604.2) | -0.35 (-9) -1.5% |
| Width inches (mm) | 7.68 (195) | 9.65 (245) | 1.97 (50) 25.6% |
| Circum. inches (mm) | 75.84 (1926.42) | 74.73 (1898.15) | -1.11 (-28.27) -1.5% |
| Sidewall Height inches (mm) | 3.07 (78) | 2.89 (73.5) | -0.18 (-4.5) -5.8% |
| Revolutions per mile (km) | 835.4 (519.1) | 847.85 (526.83) | 12.44 (7.73) 1.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.71 mph (31.71 km/h) |
| 25 mph (40.23 km/h) | 24.63 mph (39.64 km/h) |
| 30 mph (48.28 km/h) | 29.56 mph (47.57 km/h) |
| 35 mph (56.33 km/h) | 34.49 mph (55.5 km/h) |
| 40 mph (64.37 km/h) | 39.41 mph (63.43 km/h) |
| 45 mph (72.42 km/h) | 44.34 mph (71.36 km/h) |
| 50 mph (80.47 km/h) | 49.27 mph (79.29 km/h) |
| 55 mph (88.51 km/h) | 54.19 mph (87.21 km/h) |
| 60 mph (96.56 km/h) | 59.12 mph (95.14 km/h) |
| 65 mph (104.61 km/h) | 64.05 mph (103.07 km/h) |
| 70 mph (112.65 km/h) | 68.97 mph (111 km/h) |
| 75 mph (120.7 km/h) | 73.9 mph (118.93 km/h) |
| 80 mph (128.75 km/h) | 78.83 mph (126.86 km/h) |
| 85 mph (136.79 km/h) | 83.75 mph (134.79 km/h) |
| 90 mph (144.84 km/h) | 88.68 mph (142.72 km/h) |
| 95 mph (152.89 km/h) | 93.61 mph (150.64 km/h) |
| 100 mph (160.93 km/h) | 98.53 mph (158.57 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2158 | 2507 | 2699 | 2819 | 2947 | 3039 | 3140 | 3259 | 3425 | 3590 | 3774 | 3920 | 4187 | 4480 | 4710 | 4857 | 4940 | 5243 | 5665 | 6583 |
Better Fuel Economy Factory Ratios Increased Power
