Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 120/85-18 | 215/70-17.5 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.03 (661.2) | 29.35 (745.5) | 3.32 (84.3) 12.7% |
| Width inches (mm) | 4.72 (120) | 8.46 (215) | 3.74 (95) 79.2% |
| Circum. inches (mm) | 81.78 (2077.22) | 92.21 (2342.06) | 10.43 (264.84) 12.7% |
| Sidewall Height inches (mm) | 4.02 (102) | 5.93 (150.5) | 1.91 (48.5) 47.5% |
| Revolutions per mile (km) | 774.76 (481.41) | 687.15 (426.97) | -87.61 (-54.44) -11.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.55 mph (36.29 km/h) |
| 25 mph (40.23 km/h) | 28.19 mph (45.36 km/h) |
| 30 mph (48.28 km/h) | 33.82 mph (54.44 km/h) |
| 35 mph (56.33 km/h) | 39.46 mph (63.51 km/h) |
| 40 mph (64.37 km/h) | 45.1 mph (72.58 km/h) |
| 45 mph (72.42 km/h) | 50.74 mph (81.65 km/h) |
| 50 mph (80.47 km/h) | 56.37 mph (90.73 km/h) |
| 55 mph (88.51 km/h) | 62.01 mph (99.8 km/h) |
| 60 mph (96.56 km/h) | 67.65 mph (108.87 km/h) |
| 65 mph (104.61 km/h) | 73.29 mph (117.94 km/h) |
| 70 mph (112.65 km/h) | 78.92 mph (127.02 km/h) |
| 75 mph (120.7 km/h) | 84.56 mph (136.09 km/h) |
| 80 mph (128.75 km/h) | 90.2 mph (145.16 km/h) |
| 85 mph (136.79 km/h) | 95.84 mph (154.24 km/h) |
| 90 mph (144.84 km/h) | 101.47 mph (163.31 km/h) |
| 95 mph (152.89 km/h) | 107.11 mph (172.38 km/h) |
| 100 mph (160.93 km/h) | 112.75 mph (181.45 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1749 | 2031 | 2188 | 2284 | 2389 | 2463 | 2545 | 2642 | 2776 | 2909 | 3058 | 3177 | 3393 | 3631 | 3817 | 3936 | 4003 | 4249 | 4591 | 5335 |
Better Fuel Economy Factory Ratios Increased Power
