Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 365/35-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 28.06 (712.7) | -0.18 (-4.5) -0.6% |
| Width inches (mm) | 12.8 (325) | 14.37 (365) | 1.57 (40) 12.3% |
| Circum. inches (mm) | 88.71 (2253.15) | 88.15 (2239.01) | -0.56 (-14.14) -0.6% |
| Sidewall Height inches (mm) | 5.12 (130) | 5.03 (127.75) | -0.09 (-2.25) -1.7% |
| Revolutions per mile (km) | 714.26 (443.82) | 718.77 (446.62) | 4.51 (2.8) 0.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.87 mph (31.98 km/h) |
| 25 mph (40.23 km/h) | 24.84 mph (39.98 km/h) |
| 30 mph (48.28 km/h) | 29.81 mph (47.98 km/h) |
| 35 mph (56.33 km/h) | 34.78 mph (55.97 km/h) |
| 40 mph (64.37 km/h) | 39.75 mph (63.97 km/h) |
| 45 mph (72.42 km/h) | 44.72 mph (71.97 km/h) |
| 50 mph (80.47 km/h) | 49.69 mph (79.96 km/h) |
| 55 mph (88.51 km/h) | 54.65 mph (87.96 km/h) |
| 60 mph (96.56 km/h) | 59.62 mph (95.95 km/h) |
| 65 mph (104.61 km/h) | 64.59 mph (103.95 km/h) |
| 70 mph (112.65 km/h) | 69.56 mph (111.95 km/h) |
| 75 mph (120.7 km/h) | 74.53 mph (119.94 km/h) |
| 80 mph (128.75 km/h) | 79.5 mph (127.94 km/h) |
| 85 mph (136.79 km/h) | 84.47 mph (135.94 km/h) |
| 90 mph (144.84 km/h) | 89.44 mph (143.93 km/h) |
| 95 mph (152.89 km/h) | 94.4 mph (151.93 km/h) |
| 100 mph (160.93 km/h) | 99.37 mph (159.92 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1829 | 2125 | 2288 | 2390 | 2499 | 2576 | 2662 | 2763 | 2903 | 3043 | 3199 | 3324 | 3549 | 3798 | 3993 | 4118 | 4188 | 4444 | 4802 | 5581 |
Better Fuel Economy Factory Ratios Increased Power
