Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/70-18 | 125/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.99 (660.2) | 25.87 (657.2) | -0.12 (-3) -0.5% |
| Width inches (mm) | 5.71 (145) | 4.92 (125) | -0.79 (-20) -13.8% |
| Circum. inches (mm) | 81.66 (2074.08) | 81.29 (2064.65) | -0.37 (-9.42) -0.5% |
| Sidewall Height inches (mm) | 4 (101.5) | 3.94 (100) | -0.06 (-1.5) -1.5% |
| Revolutions per mile (km) | 775.93 (482.14) | 779.47 (484.34) | 3.54 (2.2) 0.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.91 mph (32.04 km/h) |
| 25 mph (40.23 km/h) | 24.89 mph (40.05 km/h) |
| 30 mph (48.28 km/h) | 29.86 mph (48.06 km/h) |
| 35 mph (56.33 km/h) | 34.84 mph (56.07 km/h) |
| 40 mph (64.37 km/h) | 39.82 mph (64.08 km/h) |
| 45 mph (72.42 km/h) | 44.8 mph (72.09 km/h) |
| 50 mph (80.47 km/h) | 49.77 mph (80.1 km/h) |
| 55 mph (88.51 km/h) | 54.75 mph (88.11 km/h) |
| 60 mph (96.56 km/h) | 59.73 mph (96.12 km/h) |
| 65 mph (104.61 km/h) | 64.7 mph (104.13 km/h) |
| 70 mph (112.65 km/h) | 69.68 mph (112.14 km/h) |
| 75 mph (120.7 km/h) | 74.66 mph (120.15 km/h) |
| 80 mph (128.75 km/h) | 79.64 mph (128.16 km/h) |
| 85 mph (136.79 km/h) | 84.61 mph (136.17 km/h) |
| 90 mph (144.84 km/h) | 89.59 mph (144.18 km/h) |
| 95 mph (152.89 km/h) | 94.57 mph (152.19 km/h) |
| 100 mph (160.93 km/h) | 99.55 mph (160.2 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1984 | 2304 | 2482 | 2591 | 2710 | 2794 | 2887 | 2997 | 3148 | 3300 | 3469 | 3604 | 3849 | 4119 | 4330 | 4465 | 4541 | 4820 | 5208 | 6052 |
Better Fuel Economy Factory Ratios Increased Power
