Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/70-18 | 145/85-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.99 (660.2) | 27.7 (703.7) | 1.71 (43.5) 6.6% |
| Width inches (mm) | 5.71 (145) | 5.71 (145) | 0 (0) 0% |
| Circum. inches (mm) | 81.66 (2074.08) | 87.04 (2210.74) | 5.38 (136.66) 6.6% |
| Sidewall Height inches (mm) | 4 (101.5) | 4.85 (123.25) | 0.86 (21.75) 21.4% |
| Revolutions per mile (km) | 775.93 (482.14) | 727.97 (452.34) | -47.97 (-29.8) -6.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.32 mph (34.31 km/h) |
| 25 mph (40.23 km/h) | 26.65 mph (42.88 km/h) |
| 30 mph (48.28 km/h) | 31.98 mph (51.46 km/h) |
| 35 mph (56.33 km/h) | 37.31 mph (60.04 km/h) |
| 40 mph (64.37 km/h) | 42.64 mph (68.62 km/h) |
| 45 mph (72.42 km/h) | 47.97 mph (77.19 km/h) |
| 50 mph (80.47 km/h) | 53.29 mph (85.77 km/h) |
| 55 mph (88.51 km/h) | 58.62 mph (94.35 km/h) |
| 60 mph (96.56 km/h) | 63.95 mph (102.92 km/h) |
| 65 mph (104.61 km/h) | 69.28 mph (111.5 km/h) |
| 70 mph (112.65 km/h) | 74.61 mph (120.08 km/h) |
| 75 mph (120.7 km/h) | 79.94 mph (128.65 km/h) |
| 80 mph (128.75 km/h) | 85.27 mph (137.23 km/h) |
| 85 mph (136.79 km/h) | 90.6 mph (145.81 km/h) |
| 90 mph (144.84 km/h) | 95.93 mph (154.38 km/h) |
| 95 mph (152.89 km/h) | 101.26 mph (162.96 km/h) |
| 100 mph (160.93 km/h) | 106.59 mph (171.54 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
