Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 28/8.5-17.5 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 28.04 (712.34) | 2.01 (51.14) 7.7% |
| Width inches (mm) | 4.72 (120) | 8.5 (216) | 3.78 (96) 80% |
| Circum. inches (mm) | 81.78 (2077.22) | 88.11 (2237.88) | 6.33 (160.66) 7.7% |
| Sidewall Height inches (mm) | 4.02 (102) | 5.27 (133.92) | 1.26 (31.92) 31.3% |
| Revolutions per mile (km) | 774.76 (481.41) | 719.14 (446.85) | -55.62 (-34.56) -7.2% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.55 mph (34.68 km/h) |
| 25 mph (40.23 km/h) | 26.93 mph (43.35 km/h) |
| 30 mph (48.28 km/h) | 32.32 mph (52.01 km/h) |
| 35 mph (56.33 km/h) | 37.71 mph (60.68 km/h) |
| 40 mph (64.37 km/h) | 43.09 mph (69.35 km/h) |
| 45 mph (72.42 km/h) | 48.48 mph (78.02 km/h) |
| 50 mph (80.47 km/h) | 53.87 mph (86.69 km/h) |
| 55 mph (88.51 km/h) | 59.25 mph (95.36 km/h) |
| 60 mph (96.56 km/h) | 64.64 mph (104.03 km/h) |
| 65 mph (104.61 km/h) | 70.03 mph (112.7 km/h) |
| 70 mph (112.65 km/h) | 75.41 mph (121.37 km/h) |
| 75 mph (120.7 km/h) | 80.8 mph (130.04 km/h) |
| 80 mph (128.75 km/h) | 86.19 mph (138.71 km/h) |
| 85 mph (136.79 km/h) | 91.57 mph (147.37 km/h) |
| 90 mph (144.84 km/h) | 96.96 mph (156.04 km/h) |
| 95 mph (152.89 km/h) | 102.35 mph (164.71 km/h) |
| 100 mph (160.93 km/h) | 107.73 mph (173.38 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1830 | 2126 | 2290 | 2391 | 2500 | 2578 | 2663 | 2765 | 2905 | 3045 | 3201 | 3325 | 3551 | 3800 | 3995 | 4120 | 4190 | 4447 | 4805 | 5584 |
Better Fuel Economy Factory Ratios Increased Power
