Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 205/55-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 26.88 (682.7) | -1.36 (-34.5) -4.8% |
| Width inches (mm) | 12.8 (325) | 8.07 (205) | -4.72 (-120) -36.9% |
| Circum. inches (mm) | 88.71 (2253.15) | 84.44 (2144.77) | -4.27 (-108.38) -4.8% |
| Sidewall Height inches (mm) | 5.12 (130) | 4.44 (112.75) | -0.68 (-17.25) -13.3% |
| Revolutions per mile (km) | 714.26 (443.82) | 750.36 (466.25) | 36.1 (22.43) 5.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.04 mph (30.64 km/h) |
| 25 mph (40.23 km/h) | 23.8 mph (38.3 km/h) |
| 30 mph (48.28 km/h) | 28.56 mph (45.96 km/h) |
| 35 mph (56.33 km/h) | 33.32 mph (53.62 km/h) |
| 40 mph (64.37 km/h) | 38.08 mph (61.28 km/h) |
| 45 mph (72.42 km/h) | 42.84 mph (68.94 km/h) |
| 50 mph (80.47 km/h) | 47.59 mph (76.6 km/h) |
| 55 mph (88.51 km/h) | 52.35 mph (84.26 km/h) |
| 60 mph (96.56 km/h) | 57.11 mph (91.92 km/h) |
| 65 mph (104.61 km/h) | 61.87 mph (99.58 km/h) |
| 70 mph (112.65 km/h) | 66.63 mph (107.24 km/h) |
| 75 mph (120.7 km/h) | 71.39 mph (114.89 km/h) |
| 80 mph (128.75 km/h) | 76.15 mph (122.55 km/h) |
| 85 mph (136.79 km/h) | 80.91 mph (130.21 km/h) |
| 90 mph (144.84 km/h) | 85.67 mph (137.87 km/h) |
| 95 mph (152.89 km/h) | 90.43 mph (145.53 km/h) |
| 100 mph (160.93 km/h) | 95.19 mph (153.19 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1910 | 2218 | 2389 | 2495 | 2608 | 2690 | 2779 | 2885 | 3031 | 3177 | 3340 | 3470 | 3705 | 3965 | 4168 | 4298 | 4372 | 4640 | 5014 | 5826 |
Better Fuel Economy Factory Ratios Increased Power
