Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 285/65-18 | 325/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.59 (827.7) | 35.91 (912.2) | 3.33 (84.5) 10.2% |
| Width inches (mm) | 11.22 (285) | 12.8 (325) | 1.57 (40) 14% |
| Circum. inches (mm) | 102.37 (2600.3) | 112.83 (2865.76) | 10.45 (265.46) 10.2% |
| Sidewall Height inches (mm) | 7.29 (185.25) | 8.96 (227.5) | 1.66 (42.25) 22.8% |
| Revolutions per mile (km) | 618.91 (384.57) | 561.58 (348.95) | -57.33 (-35.62) -9.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.04 mph (35.47 km/h) |
| 25 mph (40.23 km/h) | 27.55 mph (44.34 km/h) |
| 30 mph (48.28 km/h) | 33.06 mph (53.21 km/h) |
| 35 mph (56.33 km/h) | 38.57 mph (62.08 km/h) |
| 40 mph (64.37 km/h) | 44.08 mph (70.95 km/h) |
| 45 mph (72.42 km/h) | 49.59 mph (79.81 km/h) |
| 50 mph (80.47 km/h) | 55.1 mph (88.68 km/h) |
| 55 mph (88.51 km/h) | 60.61 mph (97.55 km/h) |
| 60 mph (96.56 km/h) | 66.13 mph (106.42 km/h) |
| 65 mph (104.61 km/h) | 71.64 mph (115.29 km/h) |
| 70 mph (112.65 km/h) | 77.15 mph (124.16 km/h) |
| 75 mph (120.7 km/h) | 82.66 mph (133.02 km/h) |
| 80 mph (128.75 km/h) | 88.17 mph (141.89 km/h) |
| 85 mph (136.79 km/h) | 93.68 mph (150.76 km/h) |
| 90 mph (144.84 km/h) | 99.19 mph (159.63 km/h) |
| 95 mph (152.89 km/h) | 104.7 mph (168.5 km/h) |
| 100 mph (160.93 km/h) | 110.21 mph (177.36 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1429 | 1660 | 1788 | 1867 | 1952 | 2013 | 2080 | 2159 | 2268 | 2378 | 2499 | 2597 | 2773 | 2968 | 3120 | 3217 | 3272 | 3472 | 3752 | 4360 |
Better Fuel Economy Factory Ratios Increased Power
