Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 340/40-16 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 26.71 (678.4) | -1.53 (-38.8) -5.4% |
| Width inches (mm) | 12.8 (325) | 13.39 (340) | 0.59 (15) 4.6% |
| Circum. inches (mm) | 88.71 (2253.15) | 83.91 (2131.26) | -4.8 (-121.89) -5.4% |
| Sidewall Height inches (mm) | 5.12 (130) | 5.35 (136) | 0.24 (6) 4.6% |
| Revolutions per mile (km) | 714.26 (443.82) | 755.12 (469.21) | 40.85 (25.38) 5.7% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 18.92 mph (30.45 km/h) |
| 25 mph (40.23 km/h) | 23.65 mph (38.06 km/h) |
| 30 mph (48.28 km/h) | 28.38 mph (45.67 km/h) |
| 35 mph (56.33 km/h) | 33.11 mph (53.28 km/h) |
| 40 mph (64.37 km/h) | 37.84 mph (60.89 km/h) |
| 45 mph (72.42 km/h) | 42.57 mph (68.5 km/h) |
| 50 mph (80.47 km/h) | 47.3 mph (76.11 km/h) |
| 55 mph (88.51 km/h) | 52.02 mph (83.73 km/h) |
| 60 mph (96.56 km/h) | 56.75 mph (91.34 km/h) |
| 65 mph (104.61 km/h) | 61.48 mph (98.95 km/h) |
| 70 mph (112.65 km/h) | 66.21 mph (106.56 km/h) |
| 75 mph (120.7 km/h) | 70.94 mph (114.17 km/h) |
| 80 mph (128.75 km/h) | 75.67 mph (121.78 km/h) |
| 85 mph (136.79 km/h) | 80.4 mph (129.39 km/h) |
| 90 mph (144.84 km/h) | 85.13 mph (137.01 km/h) |
| 95 mph (152.89 km/h) | 89.86 mph (144.62 km/h) |
| 100 mph (160.93 km/h) | 94.59 mph (152.23 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1922 | 2232 | 2404 | 2510 | 2625 | 2707 | 2797 | 2903 | 3050 | 3197 | 3361 | 3492 | 3729 | 3990 | 4195 | 4326 | 4399 | 4669 | 5045 | 5863 |
Better Fuel Economy Factory Ratios Increased Power
