Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 215/40-19 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 25.77 (654.6) | -2.46 (-62.6) -8.7% |
| Width inches (mm) | 12.8 (325) | 8.46 (215) | -4.33 (-110) -33.8% |
| Circum. inches (mm) | 88.71 (2253.15) | 80.96 (2056.49) | -7.74 (-196.66) -8.7% |
| Sidewall Height inches (mm) | 5.12 (130) | 3.39 (86) | -1.73 (-44) -33.8% |
| Revolutions per mile (km) | 714.26 (443.82) | 782.57 (486.27) | 68.31 (42.44) 9.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.25 mph (29.38 km/h) |
| 25 mph (40.23 km/h) | 22.82 mph (36.72 km/h) |
| 30 mph (48.28 km/h) | 27.38 mph (44.07 km/h) |
| 35 mph (56.33 km/h) | 31.95 mph (51.41 km/h) |
| 40 mph (64.37 km/h) | 36.51 mph (58.76 km/h) |
| 45 mph (72.42 km/h) | 41.07 mph (66.1 km/h) |
| 50 mph (80.47 km/h) | 45.64 mph (73.44 km/h) |
| 55 mph (88.51 km/h) | 50.2 mph (80.79 km/h) |
| 60 mph (96.56 km/h) | 54.76 mph (88.13 km/h) |
| 65 mph (104.61 km/h) | 59.33 mph (95.48 km/h) |
| 70 mph (112.65 km/h) | 63.89 mph (102.82 km/h) |
| 75 mph (120.7 km/h) | 68.45 mph (110.17 km/h) |
| 80 mph (128.75 km/h) | 73.02 mph (117.51 km/h) |
| 85 mph (136.79 km/h) | 77.58 mph (124.85 km/h) |
| 90 mph (144.84 km/h) | 82.14 mph (132.2 km/h) |
| 95 mph (152.89 km/h) | 86.71 mph (139.54 km/h) |
| 100 mph (160.93 km/h) | 91.27 mph (146.89 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1991 | 2314 | 2491 | 2602 | 2720 | 2805 | 2898 | 3008 | 3161 | 3314 | 3483 | 3619 | 3864 | 4136 | 4347 | 4483 | 4559 | 4839 | 5229 | 6076 |
Better Fuel Economy Factory Ratios Increased Power
