Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 325/40-18 | 365/75-15 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 28.24 (717.2) | 36.56 (928.5) | 8.32 (211.3) 29.5% |
| Width inches (mm) | 12.8 (325) | 14.37 (365) | 1.57 (40) 12.3% |
| Circum. inches (mm) | 88.71 (2253.15) | 114.84 (2916.97) | 26.13 (663.82) 29.5% |
| Sidewall Height inches (mm) | 5.12 (130) | 10.78 (273.75) | 5.66 (143.75) 110.6% |
| Revolutions per mile (km) | 714.26 (443.82) | 551.72 (342.82) | -162.55 (-101) -22.8% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 25.89 mph (41.67 km/h) |
| 25 mph (40.23 km/h) | 32.37 mph (52.09 km/h) |
| 30 mph (48.28 km/h) | 38.84 mph (62.5 km/h) |
| 35 mph (56.33 km/h) | 45.31 mph (72.92 km/h) |
| 40 mph (64.37 km/h) | 51.78 mph (83.34 km/h) |
| 45 mph (72.42 km/h) | 58.26 mph (93.76 km/h) |
| 50 mph (80.47 km/h) | 64.73 mph (104.17 km/h) |
| 55 mph (88.51 km/h) | 71.2 mph (114.59 km/h) |
| 60 mph (96.56 km/h) | 77.68 mph (125.01 km/h) |
| 65 mph (104.61 km/h) | 84.15 mph (135.43 km/h) |
| 70 mph (112.65 km/h) | 90.62 mph (145.84 km/h) |
| 75 mph (120.7 km/h) | 97.1 mph (156.26 km/h) |
| 80 mph (128.75 km/h) | 103.57 mph (166.68 km/h) |
| 85 mph (136.79 km/h) | 110.04 mph (177.1 km/h) |
| 90 mph (144.84 km/h) | 116.52 mph (187.51 km/h) |
| 95 mph (152.89 km/h) | 122.99 mph (197.93 km/h) |
| 100 mph (160.93 km/h) | 129.46 mph (208.35 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1404 | 1631 | 1757 | 1834 | 1918 | 1978 | 2043 | 2121 | 2229 | 2336 | 2456 | 2551 | 2724 | 2916 | 3065 | 3161 | 3214 | 3411 | 3686 | 4284 |
Better Fuel Economy Factory Ratios Increased Power
