Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 32/9-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 32.08 (814.86) | 6.05 (153.66) 23.2% |
| Width inches (mm) | 4.72 (120) | 9.02 (229) | 4.29 (109) 90.8% |
| Circum. inches (mm) | 81.78 (2077.22) | 100.79 (2559.96) | 19.01 (482.74) 23.2% |
| Sidewall Height inches (mm) | 4.02 (102) | 6.04 (153.43) | 2.02 (51.43) 50.4% |
| Revolutions per mile (km) | 774.76 (481.41) | 628.66 (390.63) | -146.1 (-90.78) -18.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 24.65 mph (39.67 km/h) |
| 25 mph (40.23 km/h) | 30.81 mph (49.58 km/h) |
| 30 mph (48.28 km/h) | 36.97 mph (59.5 km/h) |
| 35 mph (56.33 km/h) | 43.13 mph (69.42 km/h) |
| 40 mph (64.37 km/h) | 49.3 mph (79.33 km/h) |
| 45 mph (72.42 km/h) | 55.46 mph (89.25 km/h) |
| 50 mph (80.47 km/h) | 61.62 mph (99.17 km/h) |
| 55 mph (88.51 km/h) | 67.78 mph (109.08 km/h) |
| 60 mph (96.56 km/h) | 73.94 mph (119 km/h) |
| 65 mph (104.61 km/h) | 80.11 mph (128.92 km/h) |
| 70 mph (112.65 km/h) | 86.27 mph (138.83 km/h) |
| 75 mph (120.7 km/h) | 92.43 mph (148.75 km/h) |
| 80 mph (128.75 km/h) | 98.59 mph (158.67 km/h) |
| 85 mph (136.79 km/h) | 104.75 mph (168.58 km/h) |
| 90 mph (144.84 km/h) | 110.92 mph (178.5 km/h) |
| 95 mph (152.89 km/h) | 117.08 mph (188.42 km/h) |
| 100 mph (160.93 km/h) | 123.24 mph (198.34 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1600 | 1859 | 2001 | 2090 | 2185 | 2253 | 2328 | 2417 | 2539 | 2662 | 2798 | 2907 | 3104 | 3322 | 3492 | 3601 | 3663 | 3887 | 4200 | 4881 |
Better Fuel Economy Factory Ratios Increased Power
