Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 135/80-17 | 145/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.5 (647.8) | 27.7 (703.7) | 2.2 (55.9) 8.6% |
| Width inches (mm) | 5.31 (135) | 5.71 (145) | 0.39 (10) 7.4% |
| Circum. inches (mm) | 80.12 (2035.12) | 87.04 (2210.74) | 6.91 (175.62) 8.6% |
| Sidewall Height inches (mm) | 4.25 (108) | 4.85 (123.25) | 0.6 (15.25) 14.1% |
| Revolutions per mile (km) | 790.78 (491.37) | 727.97 (452.34) | -62.82 (-39.03) -7.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.73 mph (34.96 km/h) |
| 25 mph (40.23 km/h) | 27.16 mph (43.71 km/h) |
| 30 mph (48.28 km/h) | 32.59 mph (52.45 km/h) |
| 35 mph (56.33 km/h) | 38.02 mph (61.19 km/h) |
| 40 mph (64.37 km/h) | 43.45 mph (69.93 km/h) |
| 45 mph (72.42 km/h) | 48.88 mph (78.67 km/h) |
| 50 mph (80.47 km/h) | 54.31 mph (87.41 km/h) |
| 55 mph (88.51 km/h) | 59.75 mph (96.15 km/h) |
| 60 mph (96.56 km/h) | 65.18 mph (104.89 km/h) |
| 65 mph (104.61 km/h) | 70.61 mph (113.63 km/h) |
| 70 mph (112.65 km/h) | 76.04 mph (122.38 km/h) |
| 75 mph (120.7 km/h) | 81.47 mph (131.12 km/h) |
| 80 mph (128.75 km/h) | 86.9 mph (139.86 km/h) |
| 85 mph (136.79 km/h) | 92.33 mph (148.6 km/h) |
| 90 mph (144.84 km/h) | 97.77 mph (157.34 km/h) |
| 95 mph (152.89 km/h) | 103.2 mph (166.08 km/h) |
| 100 mph (160.93 km/h) | 108.63 mph (174.82 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1853 | 2152 | 2318 | 2420 | 2530 | 2609 | 2696 | 2799 | 2940 | 3082 | 3240 | 3366 | 3595 | 3847 | 4044 | 4170 | 4241 | 4501 | 4864 | 5652 |
Better Fuel Economy Factory Ratios Increased Power
