Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/70-18 | 325/60-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.92 (709.2) | 33.35 (847.2) | 5.43 (138) 19.5% |
| Width inches (mm) | 7.09 (180) | 12.8 (325) | 5.71 (145) 80.6% |
| Circum. inches (mm) | 87.72 (2228.02) | 104.79 (2661.56) | 17.07 (433.54) 19.5% |
| Sidewall Height inches (mm) | 4.96 (126) | 7.68 (195) | 2.72 (69) 54.8% |
| Revolutions per mile (km) | 722.32 (448.83) | 604.66 (375.72) | -117.66 (-73.11) -16.3% |
325/60-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.89 mph (38.45 km/h) |
| 25 mph (40.23 km/h) | 29.86 mph (48.06 km/h) |
| 30 mph (48.28 km/h) | 35.84 mph (57.68 km/h) |
| 35 mph (56.33 km/h) | 41.81 mph (67.29 km/h) |
| 40 mph (64.37 km/h) | 47.78 mph (76.9 km/h) |
| 45 mph (72.42 km/h) | 53.76 mph (86.51 km/h) |
| 50 mph (80.47 km/h) | 59.73 mph (96.13 km/h) |
| 55 mph (88.51 km/h) | 65.7 mph (105.74 km/h) |
| 60 mph (96.56 km/h) | 71.68 mph (115.35 km/h) |
| 65 mph (104.61 km/h) | 77.65 mph (124.96 km/h) |
| 70 mph (112.65 km/h) | 83.62 mph (134.58 km/h) |
| 75 mph (120.7 km/h) | 89.59 mph (144.19 km/h) |
| 80 mph (128.75 km/h) | 95.57 mph (153.8 km/h) |
| 85 mph (136.79 km/h) | 101.54 mph (163.41 km/h) |
| 90 mph (144.84 km/h) | 107.51 mph (173.03 km/h) |
| 95 mph (152.89 km/h) | 113.49 mph (182.64 km/h) |
| 100 mph (160.93 km/h) | 119.46 mph (192.25 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1539 | 1788 | 1925 | 2010 | 2102 | 2167 | 2239 | 2324 | 2442 | 2560 | 2691 | 2796 | 2986 | 3195 | 3359 | 3464 | 3523 | 3739 | 4040 | 4695 |
Better Fuel Economy Factory Ratios Increased Power
