Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 180/70-18 | 325/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.92 (709.2) | 30.8 (782.2) | 2.87 (73) 10.3% |
| Width inches (mm) | 7.09 (180) | 12.8 (325) | 5.71 (145) 80.6% |
| Circum. inches (mm) | 87.72 (2228.02) | 96.75 (2457.35) | 9.03 (229.34) 10.3% |
| Sidewall Height inches (mm) | 4.96 (126) | 6.4 (162.5) | 1.44 (36.5) 29% |
| Revolutions per mile (km) | 722.32 (448.83) | 654.91 (406.94) | -67.41 (-41.89) -9.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.06 mph (35.5 km/h) |
| 25 mph (40.23 km/h) | 27.57 mph (44.38 km/h) |
| 30 mph (48.28 km/h) | 33.09 mph (53.25 km/h) |
| 35 mph (56.33 km/h) | 38.6 mph (62.13 km/h) |
| 40 mph (64.37 km/h) | 44.12 mph (71 km/h) |
| 45 mph (72.42 km/h) | 49.63 mph (79.88 km/h) |
| 50 mph (80.47 km/h) | 55.15 mph (88.75 km/h) |
| 55 mph (88.51 km/h) | 60.66 mph (97.63 km/h) |
| 60 mph (96.56 km/h) | 66.18 mph (106.5 km/h) |
| 65 mph (104.61 km/h) | 71.69 mph (115.38 km/h) |
| 70 mph (112.65 km/h) | 77.21 mph (124.25 km/h) |
| 75 mph (120.7 km/h) | 82.72 mph (133.13 km/h) |
| 80 mph (128.75 km/h) | 88.23 mph (142 km/h) |
| 85 mph (136.79 km/h) | 93.75 mph (150.88 km/h) |
| 90 mph (144.84 km/h) | 99.26 mph (159.75 km/h) |
| 95 mph (152.89 km/h) | 104.78 mph (168.63 km/h) |
| 100 mph (160.93 km/h) | 110.29 mph (177.5 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1667 | 1936 | 2085 | 2177 | 2277 | 2347 | 2425 | 2518 | 2645 | 2773 | 2915 | 3028 | 3234 | 3461 | 3638 | 3752 | 3815 | 4050 | 4376 | 5085 |
Better Fuel Economy Factory Ratios Increased Power
