Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 205/40-18 | 205/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.46 (621.2) | 26.07 (662.2) | 1.61 (41) 6.6% |
| Width inches (mm) | 8.07 (205) | 8.07 (205) | 0 (0) 0% |
| Circum. inches (mm) | 76.83 (1951.56) | 81.9 (2080.36) | 5.07 (128.81) 6.6% |
| Sidewall Height inches (mm) | 3.23 (82) | 4.04 (102.5) | 0.81 (20.5) 25% |
| Revolutions per mile (km) | 824.65 (512.41) | 773.59 (480.68) | -51.06 (-31.73) -6.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.32 mph (34.31 km/h) |
| 25 mph (40.23 km/h) | 26.65 mph (42.89 km/h) |
| 30 mph (48.28 km/h) | 31.98 mph (51.47 km/h) |
| 35 mph (56.33 km/h) | 37.31 mph (60.04 km/h) |
| 40 mph (64.37 km/h) | 42.64 mph (68.62 km/h) |
| 45 mph (72.42 km/h) | 47.97 mph (77.2 km/h) |
| 50 mph (80.47 km/h) | 53.3 mph (85.78 km/h) |
| 55 mph (88.51 km/h) | 58.63 mph (94.36 km/h) |
| 60 mph (96.56 km/h) | 63.96 mph (102.93 km/h) |
| 65 mph (104.61 km/h) | 69.29 mph (111.51 km/h) |
| 70 mph (112.65 km/h) | 74.62 mph (120.09 km/h) |
| 75 mph (120.7 km/h) | 79.95 mph (128.67 km/h) |
| 80 mph (128.75 km/h) | 85.28 mph (137.25 km/h) |
| 85 mph (136.79 km/h) | 90.61 mph (145.82 km/h) |
| 90 mph (144.84 km/h) | 95.94 mph (154.4 km/h) |
| 95 mph (152.89 km/h) | 101.27 mph (162.98 km/h) |
| 100 mph (160.93 km/h) | 106.6 mph (171.56 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1969 | 2287 | 2463 | 2572 | 2689 | 2773 | 2865 | 2974 | 3125 | 3275 | 3443 | 3577 | 3820 | 4088 | 4297 | 4432 | 4507 | 4783 | 5169 | 6006 |
Better Fuel Economy Factory Ratios Increased Power
