Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 145/70-18 | 175/75-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.99 (660.2) | 28.33 (719.7) | 2.34 (59.5) 9% |
| Width inches (mm) | 5.71 (145) | 6.89 (175) | 1.18 (30) 20.7% |
| Circum. inches (mm) | 81.66 (2074.08) | 89.02 (2261) | 7.36 (186.92) 9% |
| Sidewall Height inches (mm) | 4 (101.5) | 5.17 (131.25) | 1.17 (29.75) 29.3% |
| Revolutions per mile (km) | 775.93 (482.14) | 711.78 (442.28) | -64.15 (-39.86) -8.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.8 mph (35.09 km/h) |
| 25 mph (40.23 km/h) | 27.25 mph (43.86 km/h) |
| 30 mph (48.28 km/h) | 32.7 mph (52.63 km/h) |
| 35 mph (56.33 km/h) | 38.15 mph (61.4 km/h) |
| 40 mph (64.37 km/h) | 43.6 mph (70.18 km/h) |
| 45 mph (72.42 km/h) | 49.06 mph (78.95 km/h) |
| 50 mph (80.47 km/h) | 54.51 mph (87.72 km/h) |
| 55 mph (88.51 km/h) | 59.96 mph (96.49 km/h) |
| 60 mph (96.56 km/h) | 65.41 mph (105.26 km/h) |
| 65 mph (104.61 km/h) | 70.86 mph (114.04 km/h) |
| 70 mph (112.65 km/h) | 76.31 mph (122.81 km/h) |
| 75 mph (120.7 km/h) | 81.76 mph (131.58 km/h) |
| 80 mph (128.75 km/h) | 87.21 mph (140.35 km/h) |
| 85 mph (136.79 km/h) | 92.66 mph (149.12 km/h) |
| 90 mph (144.84 km/h) | 98.11 mph (157.89 km/h) |
| 95 mph (152.89 km/h) | 103.56 mph (166.67 km/h) |
| 100 mph (160.93 km/h) | 109.01 mph (175.44 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1811 | 2104 | 2266 | 2366 | 2474 | 2551 | 2636 | 2736 | 2875 | 3014 | 3168 | 3291 | 3515 | 3761 | 3954 | 4077 | 4147 | 4401 | 4756 | 5527 |
Better Fuel Economy Factory Ratios Increased Power
