Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/80-18 | 145/90-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.5 (673.2) | 28.28 (718.2) | 1.77 (45) 6.7% |
| Width inches (mm) | 5.31 (135) | 5.71 (145) | 0.39 (10) 7.4% |
| Circum. inches (mm) | 83.26 (2114.92) | 88.83 (2256.29) | 5.57 (141.37) 6.7% |
| Sidewall Height inches (mm) | 4.25 (108) | 5.14 (130.5) | 0.89 (22.5) 20.8% |
| Revolutions per mile (km) | 760.95 (472.83) | 713.27 (443.2) | -47.68 (-29.63) -6.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.34 mph (34.34 km/h) |
| 25 mph (40.23 km/h) | 26.67 mph (42.92 km/h) |
| 30 mph (48.28 km/h) | 32.01 mph (51.51 km/h) |
| 35 mph (56.33 km/h) | 37.34 mph (60.09 km/h) |
| 40 mph (64.37 km/h) | 42.67 mph (68.68 km/h) |
| 45 mph (72.42 km/h) | 48.01 mph (77.26 km/h) |
| 50 mph (80.47 km/h) | 53.34 mph (85.85 km/h) |
| 55 mph (88.51 km/h) | 58.68 mph (94.43 km/h) |
| 60 mph (96.56 km/h) | 64.01 mph (103.02 km/h) |
| 65 mph (104.61 km/h) | 69.34 mph (111.6 km/h) |
| 70 mph (112.65 km/h) | 74.68 mph (120.18 km/h) |
| 75 mph (120.7 km/h) | 80.01 mph (128.77 km/h) |
| 80 mph (128.75 km/h) | 85.35 mph (137.35 km/h) |
| 85 mph (136.79 km/h) | 90.68 mph (145.94 km/h) |
| 90 mph (144.84 km/h) | 96.02 mph (154.52 km/h) |
| 95 mph (152.89 km/h) | 101.35 mph (163.11 km/h) |
| 100 mph (160.93 km/h) | 106.68 mph (171.69 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1815 | 2109 | 2271 | 2371 | 2479 | 2557 | 2642 | 2742 | 2881 | 3020 | 3175 | 3298 | 3522 | 3769 | 3962 | 4086 | 4155 | 4410 | 4766 | 5538 |
Better Fuel Economy Factory Ratios Increased Power
