Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/70-15 | 90/90-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 21.61 (549) | 24.38 (619.2) | 2.76 (70.2) 12.8% |
| Width inches (mm) | 4.72 (120) | 3.54 (90) | -1.18 (-30) -25% |
| Circum. inches (mm) | 67.9 (1724.73) | 76.59 (1945.27) | 8.68 (220.54) 12.8% |
| Sidewall Height inches (mm) | 3.31 (84) | 3.19 (81) | -0.12 (-3) -3.6% |
| Revolutions per mile (km) | 933.1 (579.8) | 827.31 (514.07) | -105.79 (-65.73) -11.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.56 mph (36.3 km/h) |
| 25 mph (40.23 km/h) | 28.2 mph (45.38 km/h) |
| 30 mph (48.28 km/h) | 33.84 mph (54.45 km/h) |
| 35 mph (56.33 km/h) | 39.48 mph (63.53 km/h) |
| 40 mph (64.37 km/h) | 45.11 mph (72.61 km/h) |
| 45 mph (72.42 km/h) | 50.75 mph (81.68 km/h) |
| 50 mph (80.47 km/h) | 56.39 mph (90.76 km/h) |
| 55 mph (88.51 km/h) | 62.03 mph (99.83 km/h) |
| 60 mph (96.56 km/h) | 67.67 mph (108.91 km/h) |
| 65 mph (104.61 km/h) | 73.31 mph (117.98 km/h) |
| 70 mph (112.65 km/h) | 78.95 mph (127.06 km/h) |
| 75 mph (120.7 km/h) | 84.59 mph (136.13 km/h) |
| 80 mph (128.75 km/h) | 90.23 mph (145.21 km/h) |
| 85 mph (136.79 km/h) | 95.87 mph (154.29 km/h) |
| 90 mph (144.84 km/h) | 101.51 mph (163.36 km/h) |
| 95 mph (152.89 km/h) | 107.15 mph (172.44 km/h) |
| 100 mph (160.93 km/h) | 112.79 mph (181.51 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2105 | 2446 | 2634 | 2750 | 2876 | 2965 | 3064 | 3180 | 3342 | 3503 | 3682 | 3825 | 4085 | 4372 | 4596 | 4739 | 4820 | 5116 | 5528 | 6424 |
Better Fuel Economy Factory Ratios Increased Power
