Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/80-12 | 145/90-12 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.13 (536.8) | 22.28 (565.8) | 1.14 (29) 5.4% |
| Width inches (mm) | 5.71 (145) | 5.71 (145) | 0 (0) 0% |
| Circum. inches (mm) | 66.39 (1686.41) | 69.98 (1777.51) | 3.59 (91.11) 5.4% |
| Sidewall Height inches (mm) | 4.57 (116) | 5.14 (130.5) | 0.57 (14.5) 12.5% |
| Revolutions per mile (km) | 954.3 (592.98) | 905.39 (562.58) | -48.91 (-30.39) -5.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.08 mph (33.93 km/h) |
| 25 mph (40.23 km/h) | 26.35 mph (42.41 km/h) |
| 30 mph (48.28 km/h) | 31.62 mph (50.89 km/h) |
| 35 mph (56.33 km/h) | 36.89 mph (59.37 km/h) |
| 40 mph (64.37 km/h) | 42.16 mph (67.85 km/h) |
| 45 mph (72.42 km/h) | 47.43 mph (76.33 km/h) |
| 50 mph (80.47 km/h) | 52.7 mph (84.81 km/h) |
| 55 mph (88.51 km/h) | 57.97 mph (93.3 km/h) |
| 60 mph (96.56 km/h) | 63.24 mph (101.78 km/h) |
| 65 mph (104.61 km/h) | 68.51 mph (110.26 km/h) |
| 70 mph (112.65 km/h) | 73.78 mph (118.74 km/h) |
| 75 mph (120.7 km/h) | 79.05 mph (127.22 km/h) |
| 80 mph (128.75 km/h) | 84.32 mph (135.7 km/h) |
| 85 mph (136.79 km/h) | 89.59 mph (144.18 km/h) |
| 90 mph (144.84 km/h) | 94.86 mph (152.67 km/h) |
| 95 mph (152.89 km/h) | 100.13 mph (161.15 km/h) |
| 100 mph (160.93 km/h) | 105.4 mph (169.63 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2304 | 2677 | 2883 | 3010 | 3147 | 3245 | 3353 | 3481 | 3657 | 3834 | 4030 | 4187 | 4471 | 4785 | 5030 | 5187 | 5275 | 5598 | 6049 | 7030 |
Better Fuel Economy Factory Ratios Increased Power
