Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/80-18 | 145/80-17 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.5 (673.2) | 26.13 (663.8) | -0.37 (-9.4) -1.4% |
| Width inches (mm) | 5.31 (135) | 5.71 (145) | 0.39 (10) 7.4% |
| Circum. inches (mm) | 83.26 (2114.92) | 82.1 (2085.39) | -1.16 (-29.53) -1.4% |
| Sidewall Height inches (mm) | 4.25 (108) | 4.57 (116) | 0.31 (8) 7.4% |
| Revolutions per mile (km) | 760.95 (472.83) | 771.72 (479.53) | 10.78 (6.7) 1.4% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.72 mph (31.74 km/h) |
| 25 mph (40.23 km/h) | 24.65 mph (39.67 km/h) |
| 30 mph (48.28 km/h) | 29.58 mph (47.61 km/h) |
| 35 mph (56.33 km/h) | 34.51 mph (55.54 km/h) |
| 40 mph (64.37 km/h) | 39.44 mph (63.48 km/h) |
| 45 mph (72.42 km/h) | 44.37 mph (71.41 km/h) |
| 50 mph (80.47 km/h) | 49.3 mph (79.34 km/h) |
| 55 mph (88.51 km/h) | 54.23 mph (87.28 km/h) |
| 60 mph (96.56 km/h) | 59.16 mph (95.21 km/h) |
| 65 mph (104.61 km/h) | 64.09 mph (103.15 km/h) |
| 70 mph (112.65 km/h) | 69.02 mph (111.08 km/h) |
| 75 mph (120.7 km/h) | 73.95 mph (119.02 km/h) |
| 80 mph (128.75 km/h) | 78.88 mph (126.95 km/h) |
| 85 mph (136.79 km/h) | 83.81 mph (134.88 km/h) |
| 90 mph (144.84 km/h) | 88.74 mph (142.82 km/h) |
| 95 mph (152.89 km/h) | 93.67 mph (150.75 km/h) |
| 100 mph (160.93 km/h) | 98.6 mph (158.69 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1964 | 2281 | 2457 | 2566 | 2683 | 2766 | 2858 | 2967 | 3117 | 3268 | 3435 | 3568 | 3811 | 4078 | 4287 | 4421 | 4496 | 4772 | 5156 | 5992 |
Better Fuel Economy Factory Ratios Increased Power
