Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/40-18 | 205/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 24.77 (629.2) | 25.26 (641.7) | 0.49 (12.5) 2% |
| Width inches (mm) | 8.46 (215) | 8.07 (205) | -0.39 (-10) -4.7% |
| Circum. inches (mm) | 77.82 (1976.69) | 79.37 (2015.96) | 1.55 (39.27) 2% |
| Sidewall Height inches (mm) | 3.39 (86) | 3.63 (92.25) | 0.25 (6.25) 7.3% |
| Revolutions per mile (km) | 814.16 (505.9) | 798.3 (496.04) | -15.86 (-9.85) -1.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.4 mph (32.83 km/h) |
| 25 mph (40.23 km/h) | 25.5 mph (41.03 km/h) |
| 30 mph (48.28 km/h) | 30.6 mph (49.24 km/h) |
| 35 mph (56.33 km/h) | 35.7 mph (57.45 km/h) |
| 40 mph (64.37 km/h) | 40.79 mph (65.65 km/h) |
| 45 mph (72.42 km/h) | 45.89 mph (73.86 km/h) |
| 50 mph (80.47 km/h) | 50.99 mph (82.07 km/h) |
| 55 mph (88.51 km/h) | 56.09 mph (90.27 km/h) |
| 60 mph (96.56 km/h) | 61.19 mph (98.48 km/h) |
| 65 mph (104.61 km/h) | 66.29 mph (106.69 km/h) |
| 70 mph (112.65 km/h) | 71.39 mph (114.89 km/h) |
| 75 mph (120.7 km/h) | 76.49 mph (123.1 km/h) |
| 80 mph (128.75 km/h) | 81.59 mph (131.31 km/h) |
| 85 mph (136.79 km/h) | 86.69 mph (139.51 km/h) |
| 90 mph (144.84 km/h) | 91.79 mph (147.72 km/h) |
| 95 mph (152.89 km/h) | 96.89 mph (155.93 km/h) |
| 100 mph (160.93 km/h) | 101.99 mph (164.13 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2032 | 2360 | 2542 | 2654 | 2775 | 2861 | 2957 | 3069 | 3225 | 3380 | 3553 | 3691 | 3942 | 4219 | 4435 | 4573 | 4651 | 4936 | 5334 | 6198 |
Better Fuel Economy Factory Ratios Increased Power
