Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/70-17 | 120/70-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 23.61 (599.8) | 24.61 (625.2) | 1 (25.4) 4.2% |
| Width inches (mm) | 4.72 (120) | 4.72 (120) | 0 (0) 0% |
| Circum. inches (mm) | 74.19 (1884.33) | 77.33 (1964.12) | 3.14 (79.8) 4.2% |
| Sidewall Height inches (mm) | 3.31 (84) | 3.31 (84) | 0 (0) 0% |
| Revolutions per mile (km) | 854.07 (530.69) | 819.37 (509.13) | -34.7 (-21.56) -4.1% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.85 mph (33.55 km/h) |
| 25 mph (40.23 km/h) | 26.06 mph (41.94 km/h) |
| 30 mph (48.28 km/h) | 31.27 mph (50.32 km/h) |
| 35 mph (56.33 km/h) | 36.48 mph (58.71 km/h) |
| 40 mph (64.37 km/h) | 41.69 mph (67.1 km/h) |
| 45 mph (72.42 km/h) | 46.91 mph (75.49 km/h) |
| 50 mph (80.47 km/h) | 52.12 mph (83.87 km/h) |
| 55 mph (88.51 km/h) | 57.33 mph (92.26 km/h) |
| 60 mph (96.56 km/h) | 62.54 mph (100.65 km/h) |
| 65 mph (104.61 km/h) | 67.75 mph (109.04 km/h) |
| 70 mph (112.65 km/h) | 72.96 mph (117.42 km/h) |
| 75 mph (120.7 km/h) | 78.18 mph (125.81 km/h) |
| 80 mph (128.75 km/h) | 83.39 mph (134.2 km/h) |
| 85 mph (136.79 km/h) | 88.6 mph (142.59 km/h) |
| 90 mph (144.84 km/h) | 93.81 mph (150.97 km/h) |
| 95 mph (152.89 km/h) | 99.02 mph (159.36 km/h) |
| 100 mph (160.93 km/h) | 104.23 mph (167.75 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2085 | 2422 | 2609 | 2724 | 2848 | 2937 | 3035 | 3150 | 3310 | 3469 | 3647 | 3789 | 4046 | 4330 | 4552 | 4694 | 4774 | 5066 | 5475 | 6362 |
Better Fuel Economy Factory Ratios Increased Power
